this post was submitted on 30 Mar 2024
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    473
    Arch with XZ (lemmy.world)
    submitted 7 months ago by [email protected] to c/[email protected]
    93 comments fedilink hide all child comments
     
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    [–] [email protected] 21 points 7 months ago* (last edited 7 months ago) (1 children)

    liblzma is the problem. sshd is just the first thing they found that it is attacking. liblzma is used by firefox and many other critical packages.

    [–] [email protected] 32 points 7 months ago (2 children)

    Arch does not directly link openssh to liblzma, and thus this attack vector is not possible. You can confirm this by issuing the following command:

    ldd "$(command -v sshd)"
    [–] [email protected] 7 points 7 months ago* (last edited 7 months ago) (4 children)

    Yes, this sshd attack vector isn't possible. However, they haven't decomposed the exploit and we don't know the extent of the attack. The reporter of the issue just scratched the surface. If you are using Arch, you should run pacman right now to downgrade.

    [–] [email protected] 36 points 7 months ago

    They actually have an upgrade fix for it, at least for the known parts of it. Doing a standard system upgrade will replace the xz package with one with the known backdoor removed.

    [–] [email protected] 15 points 7 months ago

    If you are using Arch, you should run pacman right now to downgrade.

    No, just update. It's already fixed. Thats the point of rolling release.

    [–] [email protected] 4 points 7 months ago

    Bold of you to assume I hare upgraded in the first place.

    [–] [email protected] 3 points 7 months ago

    I switched it with 5.4, just in case.

    [–] [email protected] 0 points 7 months ago

    Do not use ldd on untrusted binaries.

    I executed the backdoor the other day when assessing the damage.

    objdump is the better tool to use in this case.