In 2024, a backdoor was discovered hidden inside XZ Utils, a compression utility woven into many popular Linux distributions. This backdoor could have handed hackers full administrative control over millions of systems worldwide. It had been inserted into the utility by project lead and bad actor Jia Tan.
The backdoor was spotted more or less by chance. A lone Microsoft engineer, Andres Freund, wondered why there was a strange delay in the remote connection protocol SSH on Debian.
Tan first appeared in November 2021under the GitHub username…

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