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Date: Thu, 13 Sep 2012 13:31:36 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Sebastian Krahmer <krahmer@...e.de>, Tomas Hoger <thoger@...hat.com>
Subject: Re: libdbus CVE-2012-3524 fix

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On 09/12/2012 08:04 AM, Sebastian Krahmer wrote:
> 
> Hi,
> 
> As the CRD is today, and list policy requires "opening" the 
> distros-list posting, here is the forward.
> 
> As a quick fix, the exploit can also be mitigated by properly 
> placing the dbus-launch binary into the expected path, usually 
> "/bin/dbus-launch", e.g.
> 
> # ln -s /usr/bin/dbus-launch /bin/dbus-launch
> 
> since for some reason, on most dists the binary is mis-placed into
> /usr/bin. This makes an execv() fail in libdbus itself, triggering
> an execvp().
> 
> Sebastian
> 
> ----- Forwarded message from Sebastian Krahmer <krahmer@...e.de>
> -----
> 
> 
> Hi,
> 
> The recently discussed libdbus getenv() issue [1] turned out to be
> easily exploitable on various UNIX systems, including some Linux
> distributions. Common attack vectors are Xorg and spice-gtk via
> auto-launching [2]. Properly patching requires fixes for libdbus
> and libgio, depending on which you link your suid binaries. Would
> be nice if someone from RH could forward their patch, as they have
> some developers upstream and possibly access to the private git
> commit (they also already assigned this CVE). My CRD proposal is
> Sept. 12th. As can be seen in [1], this issue is indeed public
> since 1+ year.
> 
> Sebastian
> 
> [1] https://bugzilla.novell.com/show_bug.cgi?id=697105 [2]
> http://stealth.openwall.net/null/dzug.c
> 
> PS: This is a re-send, the first mail to distros list was probably 
> catched by spam filter.
> 

There is a second vulnerability as well:

spice(with naughty env variables)+glib = glib executes "dbus-launch"
from USER specific $PATH with elevated privileges.

Please use CVE-2012-4425 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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