this post was submitted on 03 Jun 2025
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    [–] SatyrSack@lemmy.sdf.org 325 points 4 days ago (44 children)

    Immediately get noticed

    Realistically, though, we are only aware of that one because it was noticed in that unlikely scenario and then widely reported. For all we know, most open source backdoors are alive and well in our computers, having gone unnoticed for years.

    [–] Ack@lemmy.ca 67 points 4 days ago* (last edited 4 days ago) (3 children)
    [–] SatyrSack@lemmy.sdf.org 58 points 4 days ago

    Yes, this particular incident.

    https://en.wikipedia.org/wiki/XZ_Utils_backdoor

    In February 2024, a malicious backdoor was introduced to the Linux build of the xz utility within the liblzma library in versions 5.6.0 and 5.6.1 by an account using the name "Jia Tan".[b][4] The backdoor gives an attacker who possesses a specific Ed448 private key remote code execution through OpenSSH on the affected Linux system. The issue has been given the Common Vulnerabilities and Exposures number CVE-2024-3094 and has been assigned a CVSS score of 10.0, the highest possible score.[5]

    Microsoft employee and PostgreSQL developer Andres Freund reported the backdoor after investigating a performance regression in Debian Sid.[8] Freund noticed that SSH connections were generating an unexpectedly high amount of CPU usage as well as causing errors in Valgrind,[9] a memory debugging tool.[10]

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