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Date: Fri, 29 Mar 2024 23:50:53 +0400
From: Loganaden Velvindron <loganaden@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: backdoor in upstream xz/liblzma leading to ssh
server compromise
I think that distros should be very careful when they start patching
openssh in general.
On Fri, Mar 29, 2024, 23:20 Andres Freund <andres@...razel.de> wrote:
> Hi,
>
> On 2024-03-29 19:44:05 +0100, Matthias Weckbecker wrote:
> > I've attached a yara rule to detect the *.o droplet you attached in the
> > email (liblzma_la-crc64-fast.o.gz).
>
> Unfortunately xz 5.61 added further obfuscations, making it harder to
> detect. Should have made it clearer that the attached .o was from 5.60.
> Among
> others 5.61 removed the two symbols you're checking against here. That's
> why
> Vegard's script looks for a specific instructions sequence, but obviously
> is
> also more obscure :/
>
> Regards,
>
> Andres
>
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