About the vulnerability
You can find the official advisory by Atlassian to this vulerability here. For details about the inner workings and exploits in the wild you should refer to the reports by Rapid7 and Cloudflare. Affected but not yet patched systems should be deemed compromised until further investigation.
About the tool
ConfluencePot is written in Golang and implements its own HTTPS server to minimize the overall attack surface. To make it appear like a legit Confluence instance it returns a bare-bones version of a Confluence landing page. Log output is written to stdout and a log file on disk. ConfluencePot DOES NOT allow attackers to execute commands/code on your machine, it only logs requests and returns a bogus response.
Building & Running it
You need a recent version of Golang to run/build confluencePot and the appropriate privileges to bind to port 443. We recommend to execute it in a tmux session for easier handling. To run ConfluencePot you either need to create a self-signed TLS certificate with openssl or request one from e.g. Let's Encrypt.
go build confluencePot.go
Testing and Issues
ConfluencePot was tested using the public exploit by Nwqda, which seems to be the most used variant in the wild at the time of writing. If you find anything wrong with confluencePot please feel free to open an issue or send us a pull request.