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TITLE:
GNOME Display Manager Configuration GUI Access Vulnerability

SECUNIA ADVISORY ID:
SA20532

VERIFY ADVISORY:
http://secunia.com/advisories/20532/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
Local system

SOFTWARE:
GNOME Display Manager (GDM) 2.x
http://secunia.com/product/2060/

DESCRIPTION:
Victor Daniel has reported a vulnerability in GNOME Display Manager
(GDM), which can be exploited by malicious, local users to bypass
certain security restrictions.

The vulnerability is caused due to an error in restricting access to
the GDM configuration GUI. This can be exploited to gain access to
the configuration GUI using the user's own password instead of the
root password.

Successful exploitation requires that the "Face Browser"
functionality is enabled.

The vulnerability has been reported in the 2.8.x, 2.14.x, and 2.15.x
branches.

SOLUTION:
Update to the fixed versions.

Version 2.8.x.:
Update to version 2.8.0.8.
http://ftp.gnome.org/pub/gnome/sources/gdm/2.8/

Version 2.14.x:
Update to version 2.14.8.
http://ftp.gnome.org/pub/gnome/sources/gdm/2.14/

Version 2.15.x:
The vulnerability has been fixed in version 2.15.4.

PROVIDED AND/OR DISCOVERED BY:
Victor Daniel

ORIGINAL ADVISORY:
http://bugzilla.gnome.org/show_bug.cgi?id=343476
http://ftp.gnome.org/pub/gnome/sources/gdm/2.8/gdm-2.8.0.8.news
http://ftp.gnome.org/pub/gnome/sources/gdm/2.14/gdm-2.14.8.news
http://ftp.acc.umu.se/pub/gnome/sources/gdm/2.15/gdm-2.15.4.news

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