[ GLSA 200709-11 ] GDM: Local Denial of Service
Date: Tue, 18 Sep 2007 23:33:55 +0200
From: Raphael Marichez <falco@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200709-11 ] GDM: Local Denial of Service
Message-ID: <20070918213355.GD27586@falco.falcal.net.>
Mail-Followup-To: gentoo-announce@gentoo.org,
bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk,
security-alerts@linuxsecurity.com
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
protocol="application/pgp-signature"; boundary="iFRdW5/EC4oqxDHL"
Content-Disposition: inline
X-Web: http://falco.bz/
X-GPG-fingerprint: 04EB 153A 6B28 3E80 87A9 9B4F A77C 4BDE 021C 5BD2
X-GPG-Key: http://subkeys.pgp.net:11371/pks/lookup?op=get&search=0x021C5BD2
Organization: Gentoo Linux Security Team
User-Agent: Mutt/1.5.16 (2007-06-09)
X-Virus-Scanned: antivirus-gw at tyumen.ru
--iFRdW5/EC4oqxDHL
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200709-11
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Low
Title: GDM: Local Denial of Service
Date: September 18, 2007
Bugs: #187919
ID: 200709-11
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
========
GDM can be crashed by a local user, preventing it from managing future
displays.
Background
==========
GDM is the GNOME display manager.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 gnome-base/gdm < 2.18.4 >= 2.18.4
*>= 2.16.7
Description
===========
The result of a g_strsplit() call is incorrectly parsed in the files
daemon/gdm.c, daemon/gdmconfig.c, gui/gdmconfig.c and
gui/gdmflexiserver.c, allowing for a null pointer dereference.
Impact
======
A local user could send a crafted message to /tmp/.gdm_socket that
would trigger the null pointer dereference and crash GDM, thus
preventing it from managing future displays.
Workaround
==========
Restrict the write permissions on /tmp/.gdm_socket to trusted users
only after each GDM restart.
Resolution
==========
All GDM users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose "gnome-base/gdm"
References
==========
[ 1 ] CVE-2007-3381
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3381
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200709-11.xml
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2007 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.5
--iFRdW5/EC4oqxDHL
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (GNU/Linux)
iQEVAwUBRvBEQzvRww8BFPxFAQLq4wf+JG7GQG+jBZySYXUd+EHKgF+kOYz+U/dW
UCBKbTVsVIZMzychdEm4XwDdAOjWXkMFMJsj9X9uIgbpA48a+k/d936QOkD1eAaE
9mc+IF+aHxCjlPhnET/3ywlO8YJvO9Sv1aDEWL9U9TpeMmZK76FtaIOPfrXx/1sY
ZZUfhXdR9LoDy/lz0zNFPqPpyOpOgTJpKuiDtCO3hMgEanf7UUkcFqBVCe0V+E1v
xteuf1EC2SdBQAtK96b70LWmI+va+w3OfwI0sgwfp0OkxSJrFlV09i11dGKaoISO
+d56c2sS7SPNTObuk3rOF8eLDqP1E9IjkjimX0xztCWXN6NA46SKWA==
=XEty
-----END PGP SIGNATURE-----
--iFRdW5/EC4oqxDHL--
