GNOME Screensaver monitor security bypass

gnome-screensaver-monitor-sec-bypass (56364) The risk level is classified as MediumMedium Risk

Description:

GNOME Screensaver could allow a local attacker to bypass security restrictions, caused by a vulnerability in the keyboard grab when adding and removing monitors repeatedly. A local attacker could exploit this vulnerability to bypass the user's locked screen and gain unauthorized access to the victim's system.

*CVSS:

Base Score: 2.1
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 1.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of Screensaver (2.28.3 or later), available from the GNOME Web site. See References.

References:

  • GNOME Bugzilla Bug 609789: CVE-2010-0422 gnome-screensaver: loses its unlock dialog and keyboard grab sometimes when plugging and unplugging monitor repeatedly.
  • GNOME Web site: GnomeScreensaver - GNOME Live!.
  • BID-38248: gnome-screensaver Monitor Topology Security Bypass Vulnerability
  • CVE-2010-0422: gnome-screensaver 2.28.x before 2.28.3 does not properly synchronize the state of screen locking and the unlock dialog in situations involving a change to the number of monitors, which allows physically proximate attackers to bypass screen locking and access an unattended workstation by connecting and disconnecting monitors multiple times, a related issue to CVE-2010-0414.
  • SA38565: gnome-screensaver Monitor Topology Change Security Bypass Weakness
  • SUSE-SR:2010:004: SUSE Security Summary Report
  • USN-907-1: gnome-screensaver vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 8.10
  • GNOME Screensaver 2.28
  • GNOME Screensaver 2.28.1
  • GNOME Screensaver 2.28.2

Reported:

Feb 12, 2010

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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