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Message-ID: <CAOGQQ28MtkwOyqSZNw7pnTqD3chm9q7q6b9H_MFNE9zRHPoMsQ@mail.gmail.com>
Date: Wed, 30 Oct 2024 20:00:35 -0300
From: Marco Benatto <mbenatto@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: mpg123 buffer overflow in versions before 1.32.8
(Frankenstein's Monster)
Hello,
I went ahead and assigned CVE-2024-10573 for this issue.
I'll try to come up with the cvss and severity analysis by tomorrow.
Please let me know if there's anything else I could help with.
Thanks,
Marco Benatto
Red Hat Product Security
secalert@...hat.com for urgent response
On Wed, Oct 30, 2024 at 2:42 PM Dr. Thomas Orgis
<thomas.orgis@...-hamburg.de> wrote:
>
> Dear list,
>
> as upstream of mpg123, I recently fixed a possibly serious issue that
> resulted in writing past a buffer on the heap under certain use cases.
> The fixed release is 1.32.8.
>
> There is no CVE for this (that I know of). If someone allocates one,
> I'd be fine with that, but I am prioritizing my time in coordination
> with demanding RL and focussed on getting the fix prepared. The bug
> report
>
> https://mpg123.org/bugs/322
>
> has always been public, so I got the fix out and decided that I do
> spend a moment on this note here, seeing that distros still ship
> vulnerable versions, notably Debian stable / oldstable — despite
> the unstable repo duly having picked up my new release. I guess if
> there is no CVE to grep in announcements people don't notice that it's
> an important security fix? My bad, then …
>
> Observing that versions 1.26.x and 1.31.x are still in the wild, I
> ported the recent security fix to those release series. Please see
> recent commits to
>
> svn://scm.orgis.org/mpg123/branches/1.26-fixes and
> svn://scm.orgis.org/mpg123/branches/1.31-fixes
>
> Current code is also visible under
>
> https://scm.orgis.org/mpg123/branches/1.26-fixes/ and
> https://scm.orgis.org/mpg123/branches/1.31-fixes/
>
> I am quoting the initial release announcement, also avaiable under
>
> https://mpg123.org/cgi-bin/news.cgi#2024-10-26
>
> Releasing mpg123 version 1.32.8: Frankenstein's Monster
>
> This is an important security update! There is possible buffer overflow
> (writing of decoded PCM samples beyond allocated output buffer) for
> streams that change output properties together with certain usage of
> libmpg123. This needed seeking around in the stream (including scanning
> it before actual decoding) to trigger. So, your usual web radio stream
> as obvious attack vector is unlikely, as you won't seek around in it.
> If you do work with stream dumps, usage of MPG123_NO_FRANKENSTEIN or
> the --no-frankenstein option to the mpg123 application is a workaround
> to avoid the formerly dangerous situation in earlier mpg123 releases.
> This also means that mpg123 will not decode streams of concatenated
> files with either varying format or leading Info frames past the first
> track anymore.
>
> With this release, the parser has been improved not to store certain
> stream properties before actual MPEG frame data matching that property
> has been stored. This avoids the inconsistency that triggered the
> overflow. Also note that if you always use a fixed decoding buffer for
> full stereo of the maximum of 1152 samples per frame, times two and
> your choice of encoding, your application is also not susceptible.
>
> Exploitation of this is not trivial, but I cannot rule out the
> possibility of gaining code execution. Your exploit payload needs to
> pass through an MPEG decoder and PCM synth before possibly reaching the
> CPU. Some heap corruption can follow at the least. So update or
> mitigate. If you run 1.32.x, there is no excuse not to get the the
> latest bugfix release now.
>
> Basically any version of mpg123 is affected by this, at least those
> that explicitly support so-called Frankenstein streams.
>
> Thanks to kkkkk123 for bringing this heir to the initial bug 322 to my
> attention.
>
>
> Alrighty then,
>
> Thomas
>
> --
> Dr. Thomas Orgis
> HPC @ Universität Hamburg
>
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