Injecting code into any Homebrew Cask by attacking GitHub Actions script
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This video is an explanation of the vulnerability in GitHub Actions script used by Homebrew repository to automatically merge some commits. The attacker - RyotaK was able to publish code to any ruby file within Casks folder, thus gaining an RCE on anyone using brew casks.
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Report:
https://blog.ryotak.me/post/homebrew-...
Reporter's twitter:
/ ryotkak
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/ gregxsunday
Timestamps:
00:00 Intro
00:21 Auto-updating Homebrew Casks
02:43 Hiding lines from git_diff
05:54 What does ++ mean in Ruby?
06:32 Bypassing regex filename match
06:55 Dealing with undefined variables
07:32 Bypassing Rubocop