(Red Hat Issues Fix) gnome-screensaver Lets Local Users Bypass the Password
SecurityTracker Alert ID: 1019754|
SecurityTracker URL: http://securitytracker.com/id/1019754
(Links to External Site)
Date: Apr 2 2008
User access via local system|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): prior to 2.22.1|
A vulnerability was reported in gnome-screensaver. A local user can bypass the login function.|
When the system uses a remote NIS server for authentication, a physically local user that can cause a network outage can cause gnome-screensaver to crash and unlock the screen.
Alan Matsuoka reported this vulnerability.
A physically local user can bypass the screensaver password function.|
Red Hat has released a fix.|
The Red Hat advisory is available at:
Vendor URL: live.gnome.org/GnomeScreensaver/ (Links to External Site)
Access control error|
|Underlying OS: Linux (Red Hat Enterprise)|
|Underlying OS Comments: 5|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2008:0197-01] Moderate: gnome-screensaver security update|
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Red Hat Security Advisory
Synopsis: Moderate: gnome-screensaver security update
Advisory ID: RHSA-2008:0197-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2008-0197.html
Issue date: 2008-04-02
CVE Names: CVE-2008-0887
An updated gnome-screensaver package that fixes a security flaw is now
available for Red Hat Enterprise Linux 5.
This update has been rated as having moderate security impact by the Red
Hat Security Response Team.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
gnome-screensaver is the GNOME project's official screen saver program.
A flaw was found in the way gnome-screensaver verified user passwords. When
a system used a remote directory service for login credentials, a local
attacker able to cause a network outage could cause gnome-screensaver to
crash, unlocking the screen. (CVE-2008-0887)
Users of gnome-screensaver should upgrade to this updated package, which
contains a backported patch to correct this issue.
Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.
This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
5. Bugs fixed (http://bugzilla.redhat.com/):
435773 - CVE-2008-0887 gnome-screensaver using NIS auth will unlock if NIS goes away
6. Package List:
Red Hat Enterprise Linux Desktop (v. 5 client):
Red Hat Enterprise Linux (v. 5 server):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2008 Red Hat, Inc.
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