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Message-ID: <20240329191926.rvyvzgtdpfwc256c@awork3.anarazel.de>
Date: Fri, 29 Mar 2024 12:19:26 -0700
From: Andres Freund <andres@...razel.de>
To: oss-security@...ts.openwall.com
Subject: Re: backdoor in upstream xz/liblzma leading to ssh
server compromise
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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