\u00a0\u00a0\u00a0\u00a0 \u00a01\u3001\u4ec5\u4ec5\u4ecedebug\u4e0a\u67e5\u770bognl\u7684\u8d4b\u503c\u60c5\u51b5\uff0c\u662f\u4e0d\u51c6\u786e\u7684\uff0cdebug\u53ea\u80fd\u770b\u5230\u8fd9\u4e2a\u7c7b\u5b9a\u4e49\u597d\u7684\u53d8\u91cf\u3002<\/p>\n
public void setName(String name){\u2026}<\/pre>\n\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u4f46\u662f\u5e76\u6ca1\u6709\u5b9a\u4e49\u8fc7\u8fd9\u4e2a\u5c5e\u6027\uff0c\u8fd9\u65f6debug\u65e0\u6cd5\u770b\u5230\u8fd9\u4e2a\u4e1c\u897f\uff0c\u4f46\u662f\u5176\u5b9eognl\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7name=zzzzz\u8c03\u7528\uff0c\u5e76\u4e14\u80fd\u628azzzz\u4f20\u9012\u8fc7\u53bb\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a02\u3001\u6216\u8005\u53ea\u6709\u4e00\u4e2a\u79c1\u6709\u5c5e\u6027\uff0c\u4f46\u662f\u6ca1\u6709set\u65b9\u6cd5\uff0c\u5176\u5b9e\u4e5f\u662fognl\u4e0d\u80fd\u8d4b\u503c\u7684\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u8fd9\u4e2adebug\uff0c\u89c2\u5bdf\u8fd9\u4e2a\u6f0f\u6d1e\u65f6\uff0c\u4ec5\u4ec5\u662f\u4e2a\u53c2\u8003\uff0c\u8981\u771f\u6b63\u6df1\u5165\u8fdb\u53bb\u770b\u4ee3\u7801\u624d\u80fd\u548cognl\u7684\u89c6\u7ebf\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a03\u3001\u4e00\u4e2afinal\u7684\u5bf9\u8c61\uff0c\u6216\u8005\u53ea\u662fget\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u770b\u8d77\u6765\u50cf\u662f\u53ea\u8bfb\u7684\uff0c\u5176\u5b9e\u5bf9\u8c61\u7684\u5c5e\u6027\u8fd8\u662f\u53ef\u4ee5\u6539\u7684\uff0c\u8fd9\u4e2a\u53ea\u662f\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u4f60\u53ef\u4ee5\u7406\u89e3\u4e3a\u6307\u9488\u6307\u5411\u7684\u5730\u5740\u4e0d\u80fd\u53d8\uff0c\u4f46\u662f\u6307\u5411\u7684\u90a3\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u662f\u53ef\u4ee5\u4fee\u6539\u7684\u3002<\/p>\n
\u4e3e\u4f8b\uff1a<\/p>\n
\r\npublic User getUser()\r\n{\r\nreturn this.user;\r\n}\r\npublic final User user;\r\n<\/pre>\n\u00a0\u00a0\u00a0\u00a0 \u00a0\u8fd9\u4e24\u5904\u4ee3\u7801\uff0c\u5176\u5b9e\u771f\u6b63\u8fd4\u56de\u7ed9OGNL\u7684\u90fd\u662fuser\u5bf9\u8c61\uff0c\u5bf9\u8c61\u7684\u5c5e\u6027\u53ea\u8981\u8fd8\u6709set\u65b9\u6cd5\uff0c\u4e5f\u90fd\u662f\u53ef\u4ee5\u88ab\u4fee\u6539\u7684\u3002\u4f9d\u7136\u53ef\u4ee5\u901a\u8fc7<\/p>\n
url?user.name=xxx<\/pre>\n\u00a0\u00a0\u00a0\u00a0 \u00a0\u5bf9user\u7684name\u8d4b\u503c\u3002<\/p>\n
struts2\u8fd0\u884c\u5728tomcat8.0.1rc5(2013,11\u6708\u524d)\u7684\u4efb\u610f\u6587\u4ef6\u8bfb\u53d6\u6f0f\u6d1e<\/strong><\/p>\n\u00a0\u00a0\u00a0\u00a0 \u00a0\u5728tomcat\u7684\u73af\u5883\u4e0b\uff0cclassLoader\u4f1a\u6302\u8f7d\u4e00\u4e2aresources\uff0c\u7c7b\u540d\u53eb\u505a\u201cStandardRoot\u201d\uff0c\u8fd9\u4e2a\u6050\u6016\u7684\u4e1c\u897f\uff0c\u548ctomcat\u7684\u8d44\u6e90\u6587\u4ef6\u7ba1\u7406\u6709\u5173\uff0cdebug\u770b\u5230\u7684\u7b2c\u4e00\u4e2a\u5c5e\u6027\u5c31\u662f\u975e\u5e38\u5371\u9669\u7684\u5c5e\u6027\u201callowLinking\u201d\u3002<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image005.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u8fd9\u4e2a\u4e8b\u60c5\uff0c\u8981\u4ece\u5f88\u4e45\u5f88\u4e45\u4ee5\u524d\uff0cstruts\u4fee\u8865\u7684\u4e00\u4e2a\u4efb\u610f\u6587\u4ef6\u8bfb\u53d6\u6f0f\u6d1e\u8bf4\u8d77\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0http:\/\/struts.apache.org\/release\/2.3.x\/docs\/s2-004.html<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u8fd9\u662f\u4e00\u4e2a\u76ee\u5f55\u5217\u8868+\u6587\u4ef6\u8bfb\u53d6\u6f0f\u6d1e\uff0c\u4fee\u8865\u65b9\u6848\u975e\u5e38\u9634\u9669\uff0c\u6ca1\u6709\u91c7\u7528\u6b63\u89c4\u7684\u624b\u6bb5\uff0c\u5728\u6846\u67b6\u5c42\u89e3\u51b3\u6f0f\u6d1e\uff0c\u800c\u662f\u5229\u7528\u4e86web\u5bb9\u5668\u7684\u4e00\u4e2a\u516c\u7ea6\u7279\u6027\uff0cjsp\u7684web\u5bb9\u5668\u90fd\u9075\u5b88\u4e00\u4e2a\u89c4\u5219\u3002<\/p>\n
\u5f53\u4e00\u4e2a\u8def\u5f84\u53eb\u505a\u201c\/var\/www\/tomcat\/webapps\/demo\/struts\/..\/\u201d\u65f6\uff0c\u8c03\u7528<\/p>\n
getClassLoader().getResource(Path)<\/pre>\n\u8fd4\u56de\u8def\u5f84\u4e3a\uff1a<\/p>\n
\u201c\/var\/www\/tomcat\/webapps\/demo\/\u201d<\/pre>\n\u4f1a\u628a\/..\/\u53bb\u6389\uff0c\u5e76\u4e14\u76f4\u63a5\u5230\u8fbe\u76ee\u7684\u76ee\u5f55\u3002<\/p>\n
\u8fd9\u4e2a\u53eb\u505aweb\u5bb9\u5668\u7279\u6027\uff0c\u7531web\u5bb9\u5668\u8bf4\u4e86\u7b97\uff0c\u54ea\u5929web\u5bb9\u5668\u751f\u6c14\u4e86\uff0c\u60f3\u53d8\u4e86\uff0cstruts\u6ca1\u6709\u8bdd\u8bed\u6743\u3002\u4e8b\u5b9e\u4e0a\uff0c\u6211\u4e00\u76f4\u559c\u6b22\u8bb2\u6846\u67b6\u5b89\u5168\uff0c\u5176\u4e2d\u4e00\u6761\u51c6\u5219\uff0c\u5c31\u662f\u201c\u6846\u67b6\u4e0d\u8981\u4f9d\u9760web\u5bb9\u5668\u7684\u7279\u6027\u505a\u9632\u5fa1\u201d\uff0c\u5f53\u7136\uff0c\u4eca\u5929\u4e0d\u8ba8\u8bba\u8fd9\u4e2a\u8bdd\u9898\uff0c\u53ea\u662f\u7a0d\u5fae\u505a\u4e2a\u94fa\u57ab\u3002<\/p>\n
\u5f53\u65f6\u4fee\u8865\u4ee3\u7801\u4e3a\uff1a<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image007.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u7528\u6237\u63d0\u4ea4\u201cstruts\/..\/\u201d\u65f6\uff0cpathEnding=\u201cstruts\/..\/\u201d\u3002<\/p>\n
\u4f46\u662f<\/p>\n
\r\nresourceUrl=\u201c\/var\/www\/tomcat\/webapps\/demo\/\u201d\r\n<\/pre>\n\u00a0\u00a0\u00a0\u00a0 \u00a0\u6240\u4ee5\u5e76\u4e0d\u4ee5pathEnding\u7ed3\u5c3e\u3002\u8fd9\u79cd\u7325\u7410\u7684\u505a\u6cd5\uff0c\u5f53\u65f6\u786e\u5b9e\u6709\u6548\u3002<\/p>\n
tomcat8\u8fd9\u4e2a\u7248\u672c\u7a81\u7136\u62bd\u98ce\u4e86\uff0c\u91cd\u5199\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u8fd8\u771f\u7684\u8fd4\u56de\u4e86<\/p>\n
\r\n\u201c\/var\/www\/tomcat\/webapps\/demo\/struts\/..\/\u201d\r\n<\/pre>\n\u5ba3\u544a\u6ca6\u9677\u3002\u4f46\u662f\u4ee3\u7801\u5b9e\u9645\u8fd0\u884c\u4e2d\uff0c\u6709\u4e2a\u8981\u6c42\uff0c\u5c31\u662f\u201cStandardRoot.allowLinking\u201d\u5fc5\u987b\u662ftrue\uff08\u9ed8\u8ba4\u80af\u5b9a\u662ffalse\uff09\u3002
\n\u673a\u4f1a\u6765\u4e86\u3002
\n\u9996\u5148\u63d0\u4ea4\uff1a<\/p>\n
\r\nhttp:\/\/localhost:8080\/demo\/t1.action?class.classLoader.resources.allowLinking=true\r\n<\/pre>\ndebug\u53ef\u4ee5\u770b\u5230\u5df2\u7ecf\u662ftrue\u3002
\n\u7136\u540e\u6309\u7167\u4ee5\u524d\u7684\u653b\u51fb\u65b9\u6cd5\uff1a<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image009.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u5c31\u53ef\u4ee5\u8f7b\u6613\u8bfb\u53d6\u4efb\u610f\u6587\u4ef6\uff0c\u62ff\u5230\u6570\u636e\u5e93\u5bc6\u7801\u7b49\u7b49\u3002<\/p>\n
\u8fd9\u662f\u4e24\u4e2a\u6f0f\u6d1e\u7ed3\u5408\u7684\u6210\u679c\uff0c\u975e\u5e38\u9057\u61be\u7684\u662f\uff0c\u5728RC5\u8fd9\u4e2a\u7248\u672c\u4e4b\u540e\uff0c\u6709\u4eba\u7ed9tomcat\u63d0\u4ea4\u4e86\u4e00\u4e2a\u9700\u6c42\uff0c\u5927\u6982\u57282013\u5e7411\u6708\u5de6\u53f3\uff0ctomcat\u7684\u4e00\u4e2a\u4e0d\u91cd\u8981\u7684\u9700\u6c42\u4e2d\uff08\u521a\u597d\u8fd9\u4e2a\u9700\u6c42\u6d89\u53ca\u5230\u8d44\u6e90\u6587\u4ef6\u76f8\u5173\u4ee3\u7801\uff09\uff0ctomcat\u7ef4\u62a4\u4eba\u5458\u4e5f\u8bb8\u5e76\u6ca1\u6709\u610f\u8bc6\u5230\u4e86\u8fd9\u91cc\u5b58\u5728\u8bfb\u53d6\u8d44\u6e90\u6587\u4ef6\u7684\u5a01\u80c1\uff0c\u4ec5\u4ec5\u662f\u628a\u8bfb\u53d6\u8d44\u6e90\u529f\u80fd\u91cd\u65b0\u62bd\u8c61\u89c4\u5212\u4e86\u4e00\u6b21\uff0c\u7ed3\u679c\u987a\u5e26\u4fee\u8865\u4e86\u8fd9\u4e2a\u6f0f\u6d1e\uff0c\u8fd9\u95ee\u9898\u4ea7\u751f\u7684\u7406\u7531\u975e\u5e38\u51a4\u5c48\uff0c\u4fee\u8865\u7684\u7406\u7531\u975e\u5e38\u51a4\u5c48\uff0c\u6700\u90c1\u95f7\u7684\u662f\u6211\uff0c\u6d3b\u751f\u751f\u7684\uff0c0day\u6ca1\u4e86\u3002\u539f\u672c\u6cbe\u6cbe\u81ea\u559c\u4ee5\u4e3a\u53ef\u4ee5\u5927\u6740\u56db\u65b9\uff0c\u7ed3\u679c\u5927\u795e\u6253\u4e86\u4e2a\u55b7\u568f\u3002<\/p>\n
\u6700\u540e\u987a\u5e26\u8bf4\u4e00\u53e5\uff0c\u8fd9\u4e2a\u6f0f\u6d1e\u53ea\u5728windows\u4e0b\u6b63\u5e38\uff0clinux\u4e0b\u672a\u77e5\u539f\u56e0\u62bd\u98ce\u3002<\/p>\n
tomcat8\u4e0b\u9ed1\u6389struts2\u5e94\u7528\u7684\u9996\u9875<\/strong><\/p>\n\u4f46\u662f\u4e0d\u8981\u7d27\uff0ctomcat\u662f\u4e0d\u53ef\u80fd\u7ed9struts\u89e3\u51b3\u6839\u672c\u95ee\u9898\u7684\uff0cstandardroot\u66b4\u9732\u51fa\u6765\uff0c\u53ef\u4ee5\u987a\u5e26\u5f71\u54cd\u5f88\u591a\u4e1c\u897f\u3002\u8fd9\u4e2a\u7b97DDOS\u4e48\uff1f\u5176\u5b9e\u6211\u53ef\u4ee5\u628a\u201cHacked by kxlzx\u201d\u5199\u5230\u4f60\u7684\u5e94\u7528\u9996\u9875\u53bb\u3002<\/p>\n
\u6210\u56e0\u975e\u5e38\u7684\u201c\u6b63\u5e38\u201d\uff0c\u56e0\u4e3a\u8fd9\u4e2acontext\u5c5e\u6027\u4ee3\u8868\u4e86tomcat\u7684\/conf\/context.xml\u6587\u4ef6\u7684\u914d\u7f6e\uff0c\u6211\u73b0\u5728\u628apath\u7ed9\u4f60\u6539\u4e86\uff0c\u90a3\u4e48struts\u53bb\u5904\u7406result\u65f6\uff0c\u4f1a\u7528\u8def\u5f84\u62fc\u63a5\u8bfb\u53d6\u6587\u4ef6\uff0c\u73b0\u5728\u76ee\u5f55\u540d\u88ab\u6539\u6389\u4e86\uff0c\u81ea\u7136\u5c31\u8bfb\u4e0d\u5230\u6587\u4ef6\u4e86\uff0c\u53ef\u60dc\u8fd9\u91cc\u4e0d\u80fd00\u622a\u65ad\uff0c\u5426\u5219\u53c8\u662f\u4e00\u4e2a\u4efb\u610f\u6587\u4ef6\u8bfb\u53d6\u6f0f\u6d1e\u3002<\/p>\n
\u4e0b\u9762\u662f\u88ab\u5e72\u6389\u7684\u7f51\u7ad9\uff0c\u8bbf\u95ee\u4efb\u4f55\u4e00\u4e2aaction\uff0c\u90fd\u4f1a\u6709\u5982\u4e0b\u6548\u679c\uff1a<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image011.png\")
<\/p>\n
\u770b\u770bdebug\u7684\u60c5\u51b5\uff1a<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image013.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u5f53\u524daction\u53eb\u505aT1\uff0c\u4f1a\u627e\u5230T1.jsp\uff0c\u4f46\u662f\u73b0\u5728\u76ee\u5f55\u540d\u5df2\u7ecf\u88ab\u4fee\u6539\u4e86\uff0c\u6240\u4ee5\u62a5\u9519\u3002<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image015.png\")
<\/p>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0\u8fd9\u4e2a\u95ee\u9898\u53ef\u4ee5\u5f71\u54cdtomcat8\u6240\u6709\u7248\u672c\u4e0b\u8fd0\u884c\u7684struts2\uff0c\u5bf9\u4e86\uff0c\u4f60\u4eec\u5f97\u81ea\u5df1\u8bbe\u8ba1EXP\u54c8\uff0c\u4e0d\u8981\u4e71\u5165\u3002<\/p>\n
jetty7\u5173\u673a\u6307\u4ee4<\/strong><\/p>\n\u00a0\u00a0\u00a0\u00a0 \u00a0\u65e2\u7136\u63d0\u5230\u4e86web\u5bb9\u5668\uff0c\u53ea\u6709\u7814\u7a76tomcat\uff0c\u80af\u5b9a\u4e0d\u80fd\u8986\u76d6\u5927\u5bb6\u5173\u5fc3\u7684\u5730\u65b9\uff0c\u4e8e\u662f\u6211\u9009\u62e9\u4e86\u53e6\u4e00\u4e2a\u5f00\u6e90\u514d\u8d39\u5e76\u4e14\u4f7f\u7528\u91cf\u5927\u7684\u8f7b\u91cf\u7ea7web\u5bb9\u5668\uff1ajetty\u3002<\/p>\n
\u73b0\u5728\u5148\u770b\u770bjetty\u662f\u5426\u6709\u7a81\u7834\u7684\u53e3\u5b50\u3002\u8fd9\u6b21\u8bb2\u89e3\u8def\u7ebf\u53cd\u8fc7\u6765\uff0c\u5148\u627e\u4e2a\u5f71\u54cd\u201c\u4e0d\u5927\u201d\uff0c\u5404\u4f4d\u201c\u4e0d\u662f\u201d\u5f88\u5173\u5fc3\u7684\u6f0f\u6d1e\u3002<\/p>\n
\u8fd8\u662f\u5148\u770b\u770bweb\u7ed3\u6784,\u4f7f\u7528\u8001\u529e\u6cd5\u65ad\u70b9\uff1a<\/p>\n
\r\nthis.getClass().getClassLoader();\r\n<\/pre>\n\u770b\u5230\u4e00\u4e2aclass\uff1a<\/p>\n
\r\norg.eclipse.jetty.webapp.WebAppClassLoader\r\n<\/pre>\njetty\u7684\u6f0f\u6d1e\uff0c\u6ca1\u6709tomcat\u90a3\u4e48\u542b\u84c4\uff0c\u975e\u5e38\u76f4\u63a5\u7684\uff0ccontext\u5c31\u6302\u8f7d\u5728classLoader\u4e0a\u3002<\/p>\n
![\"\"](\"http:\/\/inbreak.net\/wp-content\/uploads\/2014\/03\/struts_classLoader\/image017.png\")
<\/p>\n
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