this post was submitted on 30 Mar 2024
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In the case of Arch the backdoor also wasn't inserted into liblzma at all, because at build time there was a check to see if it's being built on a deb or rpm based system, and only inserts it in those two cases.
See https://gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27 for an analysis of the situation.
So even if Arch built their xz binaries off the backdoored tarball, it was never actually vulnerable.
I just know there is a lot of uncertainty. Maybe a complete wipe is a over reaction but it is better to be safe