Critical Vulnerability Discovery in Nix Package Manager Ecosystem
By
SuperShibe
Kettled twice. Extra chewy, extra trustworthy.
Summary
The article details how the author and a colleague discovered a critical vulnerability in the Nix package manager ecosystem that could have allowed attackers to compromise the entire Nix infrastructure and inject malicious code into nixpkgs. The vulnerability was found in GitHub Actions workflows used by Nix, where they identified security flaws that could be exploited to gain unauthorized access and control over the package repository. The discovery was made quickly (within a day) and responsibly disclosed, leading to prompt fixes. The article serves as a technical write-up explaining their methodology and findings.
Key quotes
· 4 pulledwe found a vulnerability in nixpkgs that would have allowed us to pwn pretty much the entire nix ecosystem and inject malicious code into nixpkgs
it only took us about a day from starting our search to reporting it and getting it fixed
github actions: the easy target
github actions is a ci/cd system by github
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