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Vigil@nce: GNOME, unlocking gnome-screensaver

February 2010 by Vigil@nce

A local attacker can plug a second screen, in order to stop gnome-screensaver.

- Severity: 1/4
- Consequences: user access/rights
- Provenance: user console
- Means of attack: 1 attack
- Ability of attacker: technician (2/4)
- Confidence: confirmed by the editor (5/5)
- Diffusion of the vulnerable configuration: high (3/3)
- Creation date: 15/02/2010

IMPACTED PRODUCTS

- Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The gnome-screensaver program locks the screen and displays a drawing.

When a system is locked, an attacker can:
- plug a second screen
- wait for its autodetection, and wait for the password input form to be displayed on this screen
- unplug the secondary screen
- press a few keyboard keys The gnome-screensaver then tries to handle keys associated to a non existing screen, which stops it.

A local attacker can therefore plug a second screen, in order to stop gnome-screensaver, and to access to user’s session.

CHARACTERISTICS

- Identifiers: 564464, 609789, CVE-2010-0422, VIGILANCE-VUL-9452
- Url: http://vigilance.fr/vulnerability/G...




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