[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sat, 30 Mar 2024 04:18:43 +0800
From: "Alexander E. Patrakov" <patrakov@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: backdoor in upstream xz/liblzma leading to ssh
server compromise
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.
--
Alexander E. Patrakov
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.
