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Category:   Application (Generic)  >   GNOME Display Manager Vendors:   Gnome Development Team
(Red Hat Issues Fix) GNOME Display Manager Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1028981
SecurityTracker URL:  http://securitytracker.com/id/1028981
CVE Reference:   CVE-2013-4169   (Links to External Site)
Date:  Sep 5 2013
Impact:   Execution of arbitrary code via local system, Modification of system information, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.21.1
Description:   A vulnerability was reported in GNOME Display Manager (GDM). A local user can obtain elevated privileges on the target system.

The system does not properly use temporary files in the '/tmp/.X11-unix/' directory. A local user can exploit this flaw to overwrite or modify arbitrary file contents via symbolic link attacks, including root owned files.

Vladz reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2013-1213.html

Vendor URL:  projects.gnome.org/gdm/ (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Sep 5 2013 GNOME Display Manager Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2013:1213-01] Important: gdm security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: gdm security update
Advisory ID:       RHSA-2013:1213-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-1213.html
Issue date:        2013-09-05
CVE Names:         CVE-2013-4169 
=====================================================================

1. Summary:

Updated gdm and initscripts packages that fix one security issue are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

The GNOME Display Manager (GDM) provides the graphical login screen, shown
shortly after boot up, log out, and when user-switching.

A race condition was found in the way GDM handled the X server sockets
directory located in the system temporary directory. An unprivileged user
could use this flaw to perform a symbolic link attack, giving them write
access to any file, allowing them to escalate their privileges to root.
(CVE-2013-4169)

Note that this erratum includes an updated initscripts package. To fix
CVE-2013-4169, the vulnerable code was removed from GDM and the initscripts
package was modified to create the affected directory safely during the
system boot process. Therefore, this update will appear on all systems,
however systems without GDM installed are not affected by this flaw.

Red Hat would like to thank the researcher with the nickname vladz for
reporting this issue.

All users should upgrade to these updated packages, which correct this
issue. The system must be rebooted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

988498 - CVE-2013-4169 gdm: TOCTTOU race condition on /tmp/.X11-unix

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gdm-2.16.0-59.el5_9.1.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/initscripts-8.45.42-2.el5_9.1.src.rpm

i386:
gdm-2.16.0-59.el5_9.1.i386.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.i386.rpm
gdm-docs-2.16.0-59.el5_9.1.i386.rpm
initscripts-8.45.42-2.el5_9.1.i386.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.i386.rpm

x86_64:
gdm-2.16.0-59.el5_9.1.x86_64.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.x86_64.rpm
gdm-docs-2.16.0-59.el5_9.1.x86_64.rpm
initscripts-8.45.42-2.el5_9.1.x86_64.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gdm-2.16.0-59.el5_9.1.src.rpm
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/initscripts-8.45.42-2.el5_9.1.src.rpm

i386:
gdm-2.16.0-59.el5_9.1.i386.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.i386.rpm
gdm-docs-2.16.0-59.el5_9.1.i386.rpm
initscripts-8.45.42-2.el5_9.1.i386.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.i386.rpm

ia64:
gdm-2.16.0-59.el5_9.1.ia64.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.ia64.rpm
gdm-docs-2.16.0-59.el5_9.1.ia64.rpm
initscripts-8.45.42-2.el5_9.1.ia64.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.ia64.rpm

ppc:
gdm-2.16.0-59.el5_9.1.ppc.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.ppc.rpm
gdm-docs-2.16.0-59.el5_9.1.ppc.rpm
initscripts-8.45.42-2.el5_9.1.ppc.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.ppc.rpm

s390x:
gdm-2.16.0-59.el5_9.1.s390x.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.s390x.rpm
gdm-docs-2.16.0-59.el5_9.1.s390x.rpm
initscripts-8.45.42-2.el5_9.1.s390x.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.s390x.rpm

x86_64:
gdm-2.16.0-59.el5_9.1.x86_64.rpm
gdm-debuginfo-2.16.0-59.el5_9.1.x86_64.rpm
gdm-docs-2.16.0-59.el5_9.1.x86_64.rpm
initscripts-8.45.42-2.el5_9.1.x86_64.rpm
initscripts-debuginfo-8.45.42-2.el5_9.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2013-4169.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.
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