Snyk Fetch the Flag CTF 2023 writeup: Silent Cartographer

The Silent Cartographer challenge at Snyk's Fetch the Flag CTF 2023 involved exploiting a vulnerability in the Covenant C2 framework, specifically versions prior to 0.5 that used the same JWT secret key in default builds, allowing users to fabricate and assign themselves admin-level credentials. The challenge required identifying the application, researching known exploits, retooling the published Proof of Concept, executing it, and handling the incoming reverse shell, with the added complexity of only having port 80 available due to limited exposed ports. To overcome this limitation, the exploit code was modified to force the new listener to bind to port 80, and a tunneler like Ngrok was used to create a port-forwarded listener for the incoming shell.

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