this post was submitted on 29 Mar 2024
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backdoor in upstream xz/liblzma leading to ssh server compromise (www.openwall.com)
submitted 8 months ago by Atemu@lemmy.ml to c/linux@lemmy.ml
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[–] umami_wasbi@lemmy.ml 11 points 8 months ago (1 children)

It seems like a RCE, rather an auth bypass once though. https://bsky.app/profile/filippo.abyssdomain.expert/post/3kowjkx2njy2b

[–] tal@lemmy.today 2 points 8 months ago* (last edited 8 months ago)

Apparently the backdoor reverts back to regular operation if the payload is malformed or the signature from the attacker's key doesn't verify. Unfortunately, this means that unless a bug is found, we can't write a reliable/reusable over-the-network scanner.

Maybe not. But it does mean that you can write a crawler that slams the door shut for the attacker on any vulnerable systems.

EDIT: Oh, maybe he just means that it reverts for that single invocation.