{"id":104,"date":"2023-01-20T16:43:17","date_gmt":"2023-01-20T08:43:17","guid":{"rendered":"http:\/\/blog.byzhb.top\/?p=104"},"modified":"2023-01-20T18:25:08","modified_gmt":"2023-01-20T10:25:08","slug":"xlh","status":"publish","type":"post","link":"https:\/\/blog.byzhb.top\/index.php\/2023\/01\/20\/xlh\/","title":{"rendered":"\u7c7b\u4e0e\u5e8f\u5217\u5316\u53ca\u5176\u76f8\u5173\u51fd\u6570\u7ed5\u8fc7"},"content":{"rendered":"
\n

\u7c7b\uff1a<\/h1>\n
\u5728CTF\u9898\u4e2dPHP\u7c7b\u7ecf\u5e38\u4e0e\u5e8f\u5217\u5316\u4e00\u8d77\u51fa\u73b0<\/div>\n
\u7c7b\u88ab\u5b9e\u4f8b\u5316\u540e\u53eb\u505a\u5bf9\u8c61 (\u5b9e\u4f8b\u5316\u5c31\u662f new \u7c7b\u540d() )<\/div>\n
\u7c7b\u4e2d\u7684\u53d8\u91cf\u53eb\u505a\u5c5e\u6027<\/div>\n
\u7c7b\u4e2d\u7684\u51fd\u6570\u53eb\u505a\u65b9\u6cd5<\/div>\n
\u5c5e\u6027\u548c\u65b9\u6cd5\u5728\u7c7b\u4e2d\u53ef\u7528$this->\u540d\u79f0\u00a0 \u8c03\u7528<\/div>\n
\n

\u7c7b\u4e2d\u7684\u5c5e\u6027\u4e0e\u65b9\u6cd5\u5206\u4e3a\u4ee5\u4e0b\u4e09\u79cd\u7c7b\u578b\uff1a<\/strong><\/h2>\n
    \n
  • public\uff1a\u516c\u5f00\u7684 , \u4efb\u4f55\u5730\u65b9\u90fd\u53ef\u4ee5\u8bbf\u95ee<\/li>\n
  • protected\uff1a\u53d7\u4fdd\u62a4\u7684 , \u7c7b\u5185\u81ea\u8eab , \u5176\u5b50\u7c7b\u548c\u7236\u7c7b\u53ef\u4ee5\u8bbf\u95ee<\/li>\n
  • private\uff1a\u79c1\u6709\u7684 , \u7c7b\u5185\u81ea\u8eab\u53ef\u8bbf\u95ee<\/li>\n<\/ul>\n

    PHP 7.x\u7248\u672c\u4e2d\u5bf9\u7c7b\u578b\u4e0d\u654f\u611f<\/p>\n

    \n
    PHP\u4e2d\u7c7b\u4e2d\u9ed8\u8ba4\u516c\u6709\uff0cC++\u4e2d\u7c7b\u4e2d\u9ed8\u8ba4\u79c1\u6709<\/div>\n<\/article>\n

    \u5e8f\u5217\u5316\u548c\u7c7b\u6709\u5173\u51fd\u6570\uff1a<\/h1>\n

    \u4ec0\u4e48\u662f\u5e8f\u5217\u5316\uff1a<\/h2>\n

    \u5e8f\u5217\u5316\u5c31\u662f\u4e00\u79cd\u7528\u6765\u5904\u7406\u5bf9\u8c61\u6d41\u7684\u673a\u5236\uff0c\u6240\u8c13\u5bf9\u8c61\u6d41\u4e5f\u5c31\u662f\u5c06\u5bf9\u8c61\u7684\u5185\u5bb9\u8fdb\u884c\u6d41\u5316\u3002\u53ef\u4ee5\u5bf9\u6d41\u5316\u540e\u7684\u5bf9\u8c61\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff0c\u4e5f\u53ef\u5c06\u6d41\u5316\u540e\u7684\u5bf9\u8c61\u4f20\u8f93\u4e8e\u7f51\u7edc\u4e4b\u95f4\u3002\u5e8f\u5217\u5316\u662f\u4e3a\u4e86\u89e3\u51b3\u5728\u5bf9\u5bf9\u8c61\u6d41\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u65f6\u6240\u5f15\u53d1\u7684\u95ee\u9898\u3002<\/p>\n

    \u76f8\u5173\u51fd\u6570\uff1a<\/h2>\n
    \n
    serialize()\u00a0\u00a0\u00a0 \/\/\u5e8f\u5217\u5316<\/div>\n
    \n
    __wakeup()\u00a0\u00a0\u00a0 \/\/\u5728\u53cd\u5e8f\u5217\u5316\u4e4b\u540e\u7acb\u5373\u88ab\u8c03\u7528 \uff08\u6709\u65f6\u8981\u7ed5\u8fc7\uff09<\/div>\n
    __sleep() \u00a0\u00a0 \/\/\u5728\u5e8f\u5217\u5316\u524d\u88ab\u8c03\u7528<\/div>\n
    ___destrust\u00a0\u00a0\u00a0 \/\/\u5728\u5bf9\u8c61\u88ab\u9500\u6bc1\u65f6\u88ab\u8c03\u7528<\/div>\n
    ___construct\u00a0 \/\/\u5728\u5bf9\u8c61\u521b\u5efa\u524d\u8c03\u7528\uff08new\u4e00\u4e2a\u5bf9\u8c61\u7684\u65f6\u5019\u6267\u884c\uff0c\u53cd\u5e8f\u5217\u5316\u7684\u65f6\u5019\u4e0d\u6267\u884c\uff09<\/em><\/div>\n<\/div>\n
    unserialize()\u00a0\u00a0\u00a0 \/\/\u53cd\u5e8f\u5217\u5316<\/div>\n
    \n
    unserialize\u51fd\u6570\uff0c\u5b9e\u9645\u4e0a\u4ee5\u4e0b\u9762\u7684\u6d41\u7a0b\u6267\u884c\uff1a<\/div>\n<\/div>\n
    \n

    \u00a01.\u00a0 \u6839\u636e\u5e8f\u5217\u5316\u5f62\u5f0f\uff0c\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\u64cd\u4f5c\uff0c\u76f4\u63a5\u8f6c\u6362\u6210\u5bf9\u5e94\u7c7b\u7684\u4e00\u4e2a\u4e34\u65f6\u5bf9\u8c61\u3002(\u8fd9\u91cc\u662fBsides\u7c7b)<\/p><\/blockquote>\n<\/div>\n

    \n
    \n
    \u6ce8\u610f\uff1a\u8fd9\u91cc\u7cfb\u7edf\u6267\u884c\u65f6\u4e0d\u4f1a\u8ba4\u4e3a\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u5bf9\u8c61<\/span>\uff0c\u800c\u662f\u4e00\u4e2a\u5df2\u6709\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u4e0d\u4f1a\u6267\u884c__construct\u9b54\u672f\u65b9\u6cd5(\u8be5\u65b9\u6cd5\u53ea\u6709\u5728\u521b\u5efa\u4e86\u65b0\u5bf9\u8c61\u7684\u65f6\u5019\u624d\u4f1a\u6267\u884c)<\/span><\/strong><\/span><\/div>\n
    <\/div>\n<\/div>\n
    \n
    2.\u00a0 \u5982\u679c\u6709\u8d4b\u503c\uff0c\u628a\u8fd9\u4e2a\u4e34\u65f6\u5bf9\u8c61\u8d4b\u7ed9\u53e6\u4e00\u4e2a\u53d8\u91cf\u8fdb\u884c\u7ba1\u7406\uff0c\u90a3\u4e48\u8be5\u4e34\u65f6\u5bf9\u8c61\u7531\u4e8e\u88ab\u63a5\u6536\u6240\u4ee5\u4e0d\u4f1a\u88ab\u9500\u6bc1\uff08\u5e94\u8be5\u662f\u53d8\u91cf\u6307\u5411\u4e86\u8fd9\u4e2a\u5bf9\u8c61\u7684\u5730\u5740\uff09\uff0c\u7136\u540e\u8be5\u5bf9\u8c61\u7531\u8be5\u53d8\u91cf\u7ba1\u7406\uff0c\u5e76\u4e14\u5728\u7a0b\u5e8f\u6b63\u5e38\u7ed3\u675f\u4e4b\u540e\u88ab\u9500\u6bc1(\u6b64\u65f6\u4f1a\u6267\u884c__destruct\u9b54\u672f\u65b9\u6cd5\uff01)<\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/blockquote>\n
    \n

    3.\u5982\u679c\u6ca1\u6709\u8d4b\u503c\uff0c\u4e34\u65f6\u5bf9\u8c61\u5728\u4ea7\u751f\u4e4b\u540e\u88ab\u9500\u6bc1(\u6b64\u65f6\u4f1a\u6267\u884c__destruct\u9b54\u672f\u65b9\u6cd5<\/span>)<\/p><\/blockquote>\n

    \n

    \u5c06\u7c7b\u5e8f\u5217\u5316\uff1a<\/h1>\n

    \u4e0d\u540c\u7c7b\u522b\u7684\u5c5e\u6027\u5e8f\u5217\u5316\u540e\u7684\u533a\u522b\uff1a<\/h2>\n
    \n
      \n
    • private\u7c7b\u578b\u7684\u5c5e\u6027\u5e8f\u5217\u5316\u540e\uff0c\u62ec\u53f7\u5185\u53d8\u91cf\u540d\u524d\u8981\u52a0 %00(classname)%00<\/li>\n
    • protected\u7c7b\u578b\u7684\u5c5e\u6027\u5e8f\u5217\u5316\u540e\uff0c\u62ec\u53f7\u5185\u53d8\u91cf\u540d\u524d\u52a0 %00*%00<\/li>\n<\/ul>\n

      php7.x\u7248\u672c\u53ef\u5ffd\u7565<\/p>\n<\/article>\n<\/div>\n

      \u4f8b\u5b50\uff1a<\/strong><\/h2>\n<\/div>\n
      <?php \r\nclass Name{ \r\n   private $username = 'admin'; \r\n   public $password = '100'; \r\n}\r\n $a=new Name(); \r\n echo serialize($a); \r\n?><\/pre>\n<\/article>\n
      \u5e8f\u5217\u5316\u7ed3\u679c\u4e3a\uff1a<\/strong><\/p>\n
      \n
      \n
      O:4:\"Name\":2:{s:14:\"%00Name%00username\";s:5:\"admin\";s:14:\"%00Name%00password\";s:3:\"100\";}<\/pre>\n<\/div>\n<\/article>\n
       __wakeup()\u51fd\u6570\u7ed5\u8fc7\uff1a<\/strong><\/h1>\n
      \u5728\u67d0\u4e9b\u65f6\u5019\u6211\u4eec\u9700\u8981\u7ed5\u8fc7\u53cd\u5e8f\u5217\u5316<\/span>\u65f6\u7684_wakeup()\u51fd\u6570\uff0c\u800c\u53bb\u76f4\u63a5\u6267\u884c_destrust\u51fd\u6570<\/p>\n
      \u5c06\u5e8f\u5217\u5316\u53d8\u91cf\u6570\u6539\u4e3a\u5927\u4e8e\u771f\u5b9e\u53d8\u91cf\u6570\u5373\u53ef\u7ed5\u8fc7<\/div>\n
      \u4f8b\u5982\uff1a<\/div>\n
      \n
      <\/code>O<\/span>:4<\/span>:\"Name\"<\/span>:2<\/span>:{s<\/span>:14<\/span>:\"Nameusername\"<\/span>;s<\/span>:5<\/span>:\"admin\"<\/span>;s<\/span>:14<\/span>:\"Namepassword\"<\/span>;s<\/span>:3<\/span>:\"100\"<\/span>;}<\/pre>\n
      \u8be5\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\u91cc\u6709\u4e24\u4e2a\u53d8\u91cf\uff0c\u5c062\u6539\u4e3a\u5927\u4e8e\u7684\u4efb\u610f\u6570\u5b57\uff0c<\/strong>\u4f7f\u5b83\u65e0\u6cd5\u5b8c\u6210\u53cd\u5e8f\u5217\u5316<\/span>\uff0c\u4ece\u800c\u7ed5\u8fc7_wakeup<\/strong><\/p>\n<\/div>\n
      <\/code>O<\/span>:4<\/span>:\"Name\"<\/span>:3<\/span>:{s<\/span>:14<\/span>:\"Nameusername\"<\/span>;s<\/span>:5<\/span>:\"admin\"<\/span>;s<\/span>:14<\/span>:\"Namepassword\"<\/span>;s<\/span>:3<\/span>:\"100\"<\/span>;<\/pre>\n
      \u6ce8\u610f<\/strong>\uff1a\u4e3a\u4ec0\u4e48\u65e0\u6cd5\u53cd\u5e8f\u5217\u5316<\/span>\uff0c\u4f46\u4ecd\u53ef\u4ee5<\/span>\u6267\u884c\u5bf9\u8c61\u91cc\u9762\u7684_destrust\u51fd\u6570\u5462\uff1f<\/p>\n
      \n
      \n
      unserialize<\/code>\u51fd\u6570\u53cd\u5e8f\u5217\u5316\u4ee3\u7801\u7684\u8fc7\u7a0b\u5927\u6982\u5982\u4e0b\uff1a<\/strong><\/p>\n
      \n
        \n
      • \u83b7\u53d6\u53cd\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\u2013>\u6839\u636e\u7c7b\u578b\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\u2014>\u67e5\u8868\u627e\u5230\u5bf9\u5e94\u7684\u53cd\u5e8f\u5217\u5316\u7c7b\u2013>\u6839\u636e\u5b57\u7b26\u4e32\u5224\u65ad\u5143\u7d20\u4e2a\u6570\u2013>new\u51fa\u65b0\u5b9e\u4f8b\u2013>\u8fed\u4ee3\u89e3\u6790\u5316\u5269\u4e0b\u7684\u5b57\u7b26\u4e32\u2013>\u5224\u65ad\u662f\u5426\u5177\u6709\u9b54\u6cd5\u51fd\u6570__wakeup\u5e76\u6807\u8bb0\u2014>\u91ca\u653e\u7a7a\u95f4\u5e76\u5224\u65ad\u662f\u5426\u5177\u6709\u5177\u6709\u6807\u8bb0\u2014>\u5f00\u542f\u8c03\u7528\u3002<\/li>\n<\/ul>\n<\/blockquote>\n
        \n
        \n
          \n
        • \u6839\u636e\u4e0a\u9762\u7684\u6d41\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u662f\u9010\u6b65\u5bf9\u5bf9\u8c61\u505a\u89e3\u6790\u7684\uff0c\u800c\u4e14\u89e3\u6790\u8fc7\u7a0b\u4e2d\u4f1a\u540c\u65f6\u53bb\u6839\u636e\u76f8\u5e94\u7684\u9b54\u6cd5\u51fd\u6570\u6807\u8bb0\u53bb\u8c03\u7528\u9b54\u6cd5\u51fd\u6570\uff0c\u6240\u4ee5\u8bf4\uff0c\u5373\u4f7f\u5b8c\u6574\u7684\u53cd\u5e8f\u5217\u5316\u6700\u7ec8\u5931\u8d25\u4e86\uff0c\u4f46\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u6d89\u53ca\u5230\u7684\u5bf9\u8c61\u4ecd\u7136\u662f\u53ef\u4ee5\u6b63\u5e38\u51fa\u53d1\u9b54\u6cd5\u51fd\u6570\u7684\u8c03\u7528\u7684\u3002<\/li>\n<\/ul>\n<\/blockquote>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"
          \u5728CTF\u9898\u4e2dPHP\u7c7b\u7ecf\u5e38\u4e0e\u5e8f\u5217\u5316\u4e00\u8d77\u51fa\u73b0<\/p>\n","protected":false},"author":1,"featured_media":107,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7,16,8],"class_list":["post-104","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-php","tag-16","tag-8"],"_links":{"self":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/comments?post=104"}],"version-history":[{"count":4,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/104\/revisions"}],"predecessor-version":[{"id":109,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/104\/revisions\/109"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/media\/107"}],"wp:attachment":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/media?parent=104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/categories?post=104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/tags?post=104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}