[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <lixIOlr_cPeSSS0_EVVTqw8lci0pVbGThxVoko6vjc4nCYcUMZataEuQanpLUZqPKkjNEGB8ciM0XH7aeRDM3xU5NA_H8v1nnEu4Enix3n0=@protonmail.com>
Date: Fri, 29 Mar 2024 21:14:02 +0000
From: terraminator <terraminator@...tonmail.com>
To: oss-security@...ts.openwall.com
Cc: "Alexander E. Patrakov" <patrakov@...il.com>
Subject: Re: backdoor in upstream xz/liblzma leading to ssh server compromise
I can confirm your observation:
there is no relevant difference between the "patched" and the affected version on arch linux.
48,49c48,49
< 000002f0: 0300 0000 474e 5500 71f9 a255 f686 4e44 ....GNU.q..U..ND
< 00000300: c325 3a10 dc37 9c25 c8bf b302 0000 0000 .%:..7.%........
---
> 000002f0: 0300 0000 474e 5500 69df 3c77 1c62 8668 ....GNU.i.<w.b.h
> 00000300: 86ef f245 d5b1 5834 540d f808 0000 0000 ...E..X4T.......
12804c12804
< 00032030: 2e36 2e31 2e64 6562 7567 0000 82fd 6f66 .6.1.debug....of
---
> 00032030: 2e36 2e31 2e64 6562 7567 0000 4ad1 cc28 .6.1.debug..J..(
Terraminator
Rein Fernhout (Levitating) <me@...itati.ng> schrieb am Freitag, 29. März 2024 um 21:46:
> > so I would appreciate it if somebody else confirms my conclusion.
>
>
> I can confirm there is no difference in the disassembly of libzlma in
> Archlinux packages 5.6.1-1 and 5.6.1-2.
>
> This is the difference of the hexdumps as created by xxd:
>
> 48,49c48,49
> < 000002f0: 0300 0000 474e 5500 71f9 a255 f686 4e44 ....GNU.q..U..ND
> < 00000300: c325 3a10 dc37 9c25 c8bf b302 0000 0000 .%:..7.%........
> ---
>
> > 000002f0: 0300 0000 474e 5500 69df 3c77 1c62 8668 ....GNU.i.<w.b.h
> > 00000300: 86ef f245 d5b1 5834 540d f808 0000 0000 ...E..X4T.......
>
> 12804c12804
> < 00032030: 2e36 2e31 2e64 6562 7567 0000 82fd 6f66 .6.1.debug....of
> ---
>
> > 00032030: 2e36 2e31 2e64 6562 7567 0000 4ad1 cc28 .6.1.debug..J..(
>
>
> The commit that updated the pkgrel can be seen here:
>
> https://gitlab.archlinux.org/archlinux/packaging/packages/xz/-/commit/881385757abdc39d3cfea1c3e34ec09f637424ad
>
> 5.6.1-1 was build from the tarball found in releases but 5.6.1-2 is not.
>
> On 2024-03-29 21:18, Alexander E. Patrakov wrote:
>
> > On Sat, Mar 30, 2024 at 2:59 AM Alexander E. Patrakov
> > patrakov@...il.com wrote:
> >
> > > On Sat, Mar 30, 2024 at 12:09 AM Andres Freund andres@...razel.de
> > > wrote:
> > >
> > > > == Affected Systems ==
> > > >
> > > > The attached de-obfuscated script is invoked first after configure, where it
> > > > decides whether to modify the build process to inject the code.
> > > >
> > > > These conditions include...
> > > > <snip>
> > > > Running as part of a debian or RPM package build:
> > > > if test -f "$srcdir/debian/rules" || test "x$RPM_ARCH" = "xx86_64";then
> > >
> > > Could you please confirm that the Arch Linux binary package was never
> > > actually compromised?
> >
> > Answering my own question. Supposedly (as "confirmed" by
> > https://lists.archlinux.org/archives/list/arch-security@lists.archlinux.org/thread/R3HBBSVYIRTXB4O64N2WZX55BF6IIPST/),
> > "package xz before version 5.6.1-2 is vulnerable". So, I downloaded
> > versions 5.6.1-1 (supposedly vulnerable) and 5.6.1-2 (supposedly
> > fixed) from Arch Linux Archive:
> > https://archive.archlinux.org/packages/x/xz/
> >
> > I extracted both binary packages and disassembled the liblzma.so.5.6.1
> > library contained therein using "objdump -d". The files are not
> > identical, however, their disassembly is. Therefore, either both are
> > trojaned, or none. Based on the "if test -f "$srcdir/debian/rules" ||
> > test "x$RPM_ARCH" = "xx86_64";then" line, I think that the correct
> > answer is "none", and therefore no advisory should have been created.
> > But it's 4:18am here, not the best time to think, so I would
> > appreciate it if somebody else confirms my conclusion.
> >
> > P.S. Kudos to the reproducible-builds project for making the analysis
> > that easy.
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
