\u7814\u7a76\u4eba\u5458\u6700\u8fd1\u53d1\u73b0\uff0cJava\u548cPython\u8fd0\u884c\u65f6\u90fd\u5b58\u5728\u6f0f\u6d1e\uff0c\u5b83\u4eec\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1FTP URL\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\uff0c\u6700\u7ec8\u5bfc\u81f4\u9ed1\u5ba2\u751a\u81f3\u80fd\u591f\u7ed5\u8fc7\u9632\u706b\u5899\u8bbf\u95ee\u672c\u5730\u7f51\u7edc\u3002<\/p>\n
\u4e0a\u5468\u516d\uff0c\u5b89\u5168\u7814\u7a76\u5458Alexander Klink\u516c\u5e03\u4e86\u4e00\u79cd\u5f88\u6709\u8da3\u7684\u653b\u51fb\u65b9\u5f0f\uff0c\u4ed6\u5229\u7528Java\u5e94\u7528\u4e2d\u7684XXE(XML External Entity)\u6f0f\u6d1e\u53d1\u9001\u90ae\u4ef6\u3002XXE\u6f0f\u6d1e\u5c31\u662f\u6b3a\u9a97\u5e94\u7528\u53bb\u89e3\u6790\u6784\u5efa\u7684XML\u6587\u4ef6\uff0c\u4ece\u800c\u8ba9XML\u89e3\u6790\u5668\u6cc4\u9732\u654f\u611f\u4fe1\u606f\u5982\u6587\u4ef6\u3001\u76ee\u5f55\u5217\u8868\u751a\u81f3\u662f\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\u7684\u8fdb\u7a0b\u3002<\/p>\n
Klink\u6f14\u793a\u76f8\u540c\u7c7b\u578b\u7684\u6f0f\u6d1e\u8fd8\u53ef\u4ee5\u7528\u6765\u6b3a\u9a97Java runtime\u5411\u8fdc\u7a0b\u670d\u52a1\u5668\u53d1\u8d77FTP\u8fde\u63a5\uff0cURL\u5f62\u5f0f\u662f\uff1a<\/p>\n
ftp:\/\/user:password@host:port\/file.ext<\/p>\n
\u7ed3\u679c\u53d1\u73b0Java FTP\u5ba2\u6237\u7aef\u5e76\u4e0d\u4f1a\u8fc7\u6ee4\u7279\u6b8a\u7684CR\u548cLF\u5b57\u7b26\uff0c\u800c\u4f1a\u89e3\u6790\u8fd9\u4e9b\u5b57\u7b26\u3002CRLF\u7684\u610f\u601d\u5c31\u662f\u56de\u8f66(CR, ASCII 13, \\r) \u6362\u884c(LF, ASCII 10, \\n)\u3002\u5728FTP URL\u4e2d\u63d2\u5165\u8fd9\u4e9b\u5b57\u7b26\u4f1a\u5bfc\u81f4Java FTP\u5ba2\u6237\u7aef\u6267\u884c\u8fd9\u4e9b\u547d\u4ee4\uff0c\u751a\u81f3\u8fd8\u53ef\u4ee5\u6267\u884cSMTP (Simple Mail Transfer Protocol)\u547d\u4ee4\uff0c\u56e0\u4e3aSMTP\u4e0eFTP\u8bed\u6cd5\u5f88\u76f8\u4f3c\u3002<\/p>\n
Klink\u7684\u6f14\u793a\u4e2d\uff0c\u9ed1\u5ba2\u53ef\u4ee5\u5229\u7528\u6f0f\u6d1e\u5f3a\u8febJava\u7a0b\u5e8f\u5411SMTP\u670d\u52a1\u5668\u53d1\u9001\u90ae\u4ef6\u3002<\/p>\n
Klink\u5728\u535a\u5ba2\u4ecb\u7ecd\u4e86\u653b\u51fb\u573a\u666f\uff1a\u201c\u5f53\u4f60\u80fd\u4ece\u4e00\u53f0\u80fd\u591f\u89e3\u6790XML\u7684\u670d\u52a1\u5668\u8fde\u63a5\u5230\u4e00\u53f0\u65e0\u9650\u5236\uff08\u751a\u81f3\u6ca1\u6709\u5783\u573e\u90ae\u4ef6\u3001\u75c5\u6bd2\u90ae\u4ef6\u8fc7\u6ee4\uff09\u7684\u5185\u90e8\u90ae\u4ef6\u670d\u52a1\u5668\u65f6\uff0c\u8fd9\u4e2a\u653b\u51fb\u5c31\u4f1a\u975e\u5e38\u6709\u610f\u601d\u3002\u201d<\/p>\n
Python\u548cJava\u7684\u65b0\u6f0f\u6d1e<\/p>\n
\u770b\u5230Klink\u7684\u653b\u51fb\u540e\uff0c\u6765\u81eaBlindspot Security\u7684\u7814\u7a76\u5458Timothy Morgan\u53c8\u516c\u5f00\u4e86\u4e00\u79cd\u7c7b\u4f3c\u7684\u653b\u51fb\u65b9\u5f0f\uff0c\u8fd9\u79cd\u653b\u51fb\u65b9\u5f0f\u80fd\u591f\u9488\u5bf9Java\u548cPython\u7684FTP\u2014\u2014\u7531\u4e8e\u8be5\u653b\u51fb\u53ef\u88ab\u7528\u6765\u7ed5\u8fc7\u9632\u706b\u5899\uff0c\u56e0\u6b64\u66f4\u4e3a\u4e25\u91cd\u3002<\/p>\n
Morgan\u628a\u653b\u51fb\u79f0\u4e3a\u201c\u901a\u8fc7\u6076\u610fURL\u7684FTP\u534f\u8bae\u6d41\u6ce8\u5165\u201d\uff0c\u8fd9\u79cd\u653b\u51fb\u548c\u5229\u7528\u4e86\u7f3a\u5c11CRLF\u8fc7\u6ee4\u7279\u6027\u6ce8\u5165\u6076\u610fFTP\u547d\u4ee4\u7684\u65b9\u6cd5\u662f\u7c7b\u4f3c\u7684\u3002<\/p>\n
Morgan\u6ca1\u6709\u6ce8\u5165SMTP \u547d\u4ee4\uff0c\u800c\u662f\u5229\u7528\u4e86FTP PORT\u547d\u4ee4\u8ba9\u5ba2\u6237\u7aef\u8fde\u63a5FTP\u670d\u52a1\u5668\u7684\u6307\u5b9aTCP\u7aef\u53e3\u3002<\/p>\n
\u5b89\u5168\u4eba\u5458\u6307\u51fa\uff0c\u5f88\u591a\u57fa\u4e8eLinux\u7684\u5168\u72b6\u6001\u6570\u636e\u5305\u68c0\u6d4b\u578b\u9632\u706b\u5899(SPI)\uff0c\u5305\u62ec\u5546\u4e1a\u9632\u706b\u5899\uff0c\u4f1a\u652f\u6301\u4f20\u7edf\u6a21\u5f0f\u7684FTP\uff0c\u5f53\u68c0\u6d4b\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684FTP\u6d41\u91cf\u4e2d\u7684PORT\u547d\u4ee4\u65f6\u5c31\u4f1a\u81ea\u52a8\u6253\u5f00TCP\u7aef\u53e3\uff0c\u5e76\u4e14\u8f6c\u53d1\u5230\u90a3\u4e2aFTP\u5ba2\u6237\u7aef\u7684\u5c40\u57df\u7f51IP\u3002<\/p>\n
\u8fd9\u79cd\u653b\u51fb\u5411\u91cf\u5df2\u7ecf\u5b58\u5728\u591a\u5e74\uff0c\u6240\u4ee5conntrack\u7684\u5f00\u53d1\u8005\u4eec\u4f1a\u52a0\u5165\u989d\u5916\u7684\u68c0\u67e5\u6b65\u9aa4\uff0cconntrack\u662f\u4e00\u5957\u5927\u90e8\u5206\u9632\u706b\u5899\u90fd\u4f1a\u7528\u5230\u7684Linux\u5de5\u5177\u3002\u52a0\u5165\u68c0\u67e5\u4e4b\u540e\uff0c\u7aef\u53e3\u53ea\u4f1a\u5728PORT\u547d\u4ee4\u51fa\u73b0\u5728TCP\u5305\u5f00\u59cb\u7684\u65f6\u5019\u6253\u5f00\uff0c\u8fd9\u6837\u5c31\u80fd\u786e\u4fdd\u771f\u7684\u662f\u5ba2\u6237\u7aef\u53d1\u9001\u4e86\u547d\u4ee4\u3002<\/p>\n
\u6b64\u5904\u5bf9\u9ed1\u5ba2\u800c\u8a00\uff0c\u653b\u51fb\u9700\u8981\u89e3\u51b3\u4e24\u4e2a\u95ee\u9898\uff1a<\/p>\n
1. \u53d1\u73b0\u5ba2\u6237\u7aef\u7684\u5185\u90e8IP\u5730\u5740\uff0c\u4ece\u800c\u4f2a\u9020PORT\u547d\u4ee4\uff1b<\/p>\n
2. \u8c03\u6574\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u7aef\u7684TCP\u5305\uff0c\u8ba9PORT\u547d\u4ee4\u843d\u5230\u5305\u7684\u5f00\u5934<\/p>\n
Morgan\u79f0\u4ed6\u5df2\u7ecf\u627e\u5230\u4e86\u89e3\u51b3\u8fd9\u4e24\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u901a\u8fc7\u201c\u901a\u8fc7\u6076\u610fURL\u7684FTP\u534f\u8bae\u6d41\u6ce8\u5165\u201d\uff0c\u5e76\u4e14\u4ed6\u5df2\u7ecf\u5f00\u53d1\u4e86PoC exp\u6253\u7b97\u5728Oracle\u548cPython\u4fee\u590dFTP\u5ba2\u6237\u7aef\u4ee3\u7801\u540e\u516c\u5f00\u3002<\/p>\n
\u201c\u6574\u4e2a\u653b\u51fb\uff08\u5305\u62ec\u5224\u65ad\u53d7\u5bb3\u8005\u5185\u90e8IP\u7684\u8bf7\u6c42\uff09\u662f\u901a\u8fc7\u4e09\u4e2aSSRF(\u670d\u52a1\u5668\u7aef\u8bf7\u6c42\u4f2a\u9020)\u5b9e\u73b0\u7684\uff0c\u8fd9\u4e09\u4e2a\u653b\u51fb\u6253\u5f00\u4e86TCP\u7aef\u53e3\u201d\uff0cMorgan\u5468\u4e00\u5728\u535a\u5ba2\u4e2d\u8bf4\u5230\uff0c\u201c\u6bcf\u6b21\u989d\u5916\u7684SSRF\u653b\u51fb\u90fd\u53ef\u4ee5\u6253\u5f00\u4e00\u4e2a\u65b0\u7684TCP\u7aef\u53e3\u3002\u201d<\/p>\n
\u5229\u7528\u65b9\u6cd5<\/p>\n
\u5229\u7528\u6f0f\u6d1e\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u5305\u62ec\u653b\u51fb\u90a3\u4e9b\u5b89\u88c5\u4e86Java\u7684\u7528\u6237\u3002\u7528\u6237\u751a\u81f3\u90fd\u4e0d\u9700\u8981\u6267\u884c\u6076\u610fJava applet\uff0c\u56e0\u4e3aexp\u53ef\u4ee5\u901a\u8fc7Java Web\u5f00\u59cb\u7a0b\u5e8f\u4f20\u9001\u3002<\/p>\n
\u201c\u5982\u679c\u4e00\u4e2a\u5b89\u88c5\u4e86Java\u7684\u684c\u9762\u7528\u6237\u8bbf\u95ee\u4e86\u4e00\u4e2a\u6076\u610f\u7f51\u7ad9\uff0c\u5373\u4f7fJava applet\u88ab\u5173\u95ed\uff0c\u8fd8\u662f\u53ef\u4ee5\u89e6\u53d1Java Web Start\u89e3\u6790JNLP\u6587\u4ef6\uff0c\u6587\u4ef6\u4e2d\u53ef\u4ee5\u5305\u542b\u6076\u610fFTP\u4ee3\u7801\uff0c\u4ece\u800c\u89e6\u53d1\u6f0f\u6d1e\u3002\u201d<\/p>\n
\u653b\u51fb\u8005\u8fd8\u53ef\u4ee5\u5229\u7528\u4e2d\u95f4\u4eba\u6216\u8005\u5229\u7528SSRF\/XXE\u6f0f\u6d1e\u6765\u653b\u51fb\u90a3\u4e9b\u8fd0\u884cJava\u5e94\u7528\u7684\u670d\u52a1\u5668\u3002<\/p>\n
Morgan\u8868\u793a\uff0c\u4ed6\u6210\u529f\u653b\u51fb\u4e86\u8fd0\u884c\u6700\u65b0\u5185\u6838\u7684Linux\u9632\u706b\u5899\uff0c\u800c\u6765\u81eaPalo Alto Networks\u548c\u601d\u79d1\u7684\u9632\u706b\u5899\u5728\u9ed8\u8ba4\u8bbe\u7f6e\u4e0b\u4e5f\u672a\u80fd\u5e78\u514d\u3002\u867d\u7136\u53ea\u6d4b\u8bd5\u4e86\u4e24\u6b3e\u5546\u4e1a\u9632\u706b\u5899\uff0c\u4f46\u4ed6\u9884\u8ba1\u53d7\u6b64\u5f71\u54cd\u7684\u9632\u706b\u5899\u4e0d\u5728\u5c11\u6570\u3002<\/p>\n
\u5b89\u5168\u5efa\u8bae<\/p>\n
\u5efa\u8bae\u9632\u706b\u5899\u5382\u5546\u5728Java\u548cPython\u5de5\u7a0b\u5e08\u4fee\u590d\u6f0f\u6d1e\u4e4b\u524d\u5173\u95ed\u4f20\u7edf\u7684FTP\u8f6c\u6362\u6a21\u5f0f\u3002<\/p>\n
\u7528\u6237\u5e94\u8be5\u7981\u7528\u6d4f\u89c8\u5668\u7684Java\u63d2\u4ef6\u5e76\u4e14\u53d6\u6d88.jnlp\u6587\u4ef6\u4e0eJava Web Start\u7684\u5173\u8054\u3002\u540c\u65f6\uff0c\u5bf9Java\u548cPython\u5e94\u7528\u5e94\u8be5\u5ba1\u8ba1SSRF\u548cXXE\u6f0f\u6d1e\u3002<\/p>\n
\u6b22\u8fce\u5206\u4eab\u672c\u6587\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u51fa\u5904\uff1a\u524d\u7aefABC<\/a> » Python\u4e0eJava\u66dd\u6f0f\u6d1e\uff0c\u9ed1\u5ba2\u5229\u7528FTP\u6ce8\u5165\u653b\u51fb\u53ef\u7ed5\u8fc7\u9632\u706b\u5899<\/a><\/p>","protected":false},"excerpt":{"rendered":" \u7814\u7a76\u4eba\u5458\u6700\u8fd1\u53d1\u73b0\uff0cJava\u548cPython\u8fd0\u884c\u65f6\u90fd\u5b58\u5728\u6f0f\u6d1e\uff0c\u5b83\u4eec\u672a\u80fd\u6b63\u786e\u9a8c\u8bc1FTP URL\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\uff0c\u6700\u7ec8\u5bfc\u81f4\u9ed1\u5ba2\u751a\u81f3\u80fd\u591f\u7ed5\u8fc7\u9632\u706b\u5899\u8bbf\u95ee\u672c\u5730\u7f51\u7edc\u3002 \u4e0a\u5468\u516d\uff0c\u5b89\u5168\u7814\u7a76\u5458Alexander Klink\u516c\u5e03 […]<\/p>\n","protected":false},"author":1,"featured_media":319,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[111,131,134,133,132],"_links":{"self":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/517"}],"collection":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=517"}],"version-history":[{"count":1,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/517\/revisions"}],"predecessor-version":[{"id":518,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/517\/revisions\/518"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/media\/319"}],"wp:attachment":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=517"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}