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@joernchen
joernchen / bounty.txt
Created February 22, 2014 16:17
Bounty writeup
GitHub RCE by Environment variable injection Bug Bounty writeup
Disclaimer: I'll keep this really short but I hope you'll get the key points.
GitHub blogged a while ago about some internal tool called gerve:
https://github.com/blog/530-how-we-made-github-fast
Upon git+sshing to github.com gerve basically looks up your permission
on the repo you want to interact with. Then it bounces you further in
another forced SSH session to the back end where the repo actually is.