this post was submitted on 29 Mar 2024
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If you're using
xzversion 5.6.0 or 5.6.1, please upgrade asap, especially if you're using a rolling-release distro like Arch or its derivatives. Arch has rolled out the patched version a few hours ago.Backdoor only gets inserted when building RPM or DEB. So while updating frequently is a good idea, it won't change anything for Arch users today.
Archlinux's XZ was compromised as well.
News post
Git change for not using tarballs from source
I think that was a precaution. The malicious build script ran during the build, but the backdoor itself was most likely not included in the resuling package as it checked for specific packaging systems.
https://www.openwall.com/lists/oss-security/2024/03/29/22