oss-security - Re: CVE-2012-2248: isc-dhcp, Debian-specific: build path included in PATH

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Date: Wed, 17 Oct 2012 18:41:12 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Michael Gilbert <mgilbert@...ian.org>
Subject: Re: CVE-2012-2248: isc-dhcp, Debian-specific: build
 path included in PATH

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On 10/17/2012 01:46 PM, Michael Gilbert wrote:
> On Wed, Oct 17, 2012 at 3:42 PM, Kurt Seifried wrote:
>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
>> 
>> On 10/15/2012 02:50 PM, Raphael Geissert wrote:
>>> Hi,
>>> 
>>> Michael Stapelberg, Tollef Fog Heen, and Michael Biebl
>>> discovered that dhclient was setting dhclient-script's PATH to
>>> one that included a subdirectory of the build directory[1].
>>> This issue is caused by the way isc-dhcp is packaged in
>>> Debian.
>>> 
>>> At least two versions of isc-dhcp for the amd64 (x86_64) 
>>> architecture in Debian were found two be setting PATH to a 
>>> subdirectory of /home/zero79/, which would allow a user with
>>> such HOME directory to be able to execute code as root.
>>> 
>>> To clarify the bug report: it is not specific to samba or hooks
>>> in general, PATH is injected in the environment passed to the
>>> execve() call that executes dhclient-script.
>>> 
>>> Since this issue doesn't affect the stable release, there won't
>>> be a DSA. This email is just a heads up.
>>> 
>>> [1]http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=690532
>>> 
>>> Cheers,
>>> 
>> 
>> Was this software released however?
> 
> It was uploaded to and affected Debian testing and unstable.
> Testing has not yet been officially "released", but some people use
> testing as if it were an official release.  Unstable never gets
> released.

When I say released I meant in the sense of made available for
download, not in the sense of software engineering and doing a proper
"release".

Release information here:

http://lists.alioth.debian.org/pipermail/pkg-dhcp-devel/2012-April/001275.html

Any ways as you can see it's had a CVE assigned:

So for Debian Bug report logs - #690532
CVE-2012-2248: build system paths used in -DCLIENT_PATH

So my work here is done =).

> Best wishes, Mike




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

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