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Date: Sat, 30 Mar 2024 23:03:05 +0400
From: Loganaden Velvindron <loganaden@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Re: backdoor in upstream xz/liblzma leading to ssh
server compromise
A look at systemd does show dlopen() to libarchive.
Perhaps it was supposed to be another point of entry.
On Sat, Mar 30, 2024, 20:44 Tavis Ormandy <taviso@...il.com> wrote:
> On 2024-03-29, Ivan Delalande wrote:
> > On Fri, Mar 29, 2024 at 08:51:26AM -0700, Andres Freund wrote:
> >> For which the exploit code was then adjusted:
> >>
> https://github.com/tukaani-project/xz/commit/6e636819e8f070330d835fce46289a3ff72a7b89
> >>
> >> Given the activity over several weeks, the committer is either directly
> >> involved or there was some quite severe compromise of their
> >> system. Unfortunately the latter looks like the less likely
> explanation, given
> >> they communicated on various lists about the "fixes" mentioned above.
> >
> > Knowing this, I hope the recent kernel patch series involving the same
> > person to some degree will get extra scrutiny:
> >
> https://lore.kernel.org/lkml/20240320183846.19475-1-lasse.collin@tukaani.org/t/
> >
> > Thanks Andres, incredible find and write-up!
> >
>
> It was also pointed out they submitted an odd PR to libarchive:
>
> https://github.com/libarchive/libarchive/pull/1609
>
> In summary, they replaced calls to safe_fprintf() with fprintf() --
> meaning control characters are no longer filtered from errors. That
> seems pretty minor, but now that we know they were in the business of
> obfuscating the presence of backdoors -- seems a bit suspicious.
>
> Regardless, that change has now been reverted:
>
> https://github.com/libarchive/libarchive/pull/2101
>
> Tavis.
>
> --
> _o) $ lynx lock.cmpxchg8b.com
> /\\ _o) _o) $ finger taviso@....org
> _\_V _( ) _( ) @taviso
>
>
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