GLSA-201201-16 : X.Org X Server/X Keyboard Configuration Database: Screen lock bypass

Medium Nessus Plugin ID 57722


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-201201-16 (X.Org X Server/X Keyboard Configuration Database: Screen lock bypass)

Starting with the =x11-base/xorg-server-1.11 package, the X.Org X Server again provides debugging functionality that can be used terminate an application that exclusively grabs mouse and keyboard input, like screen locking utilities.
Gu1 reported that the X Keyboard Configuration Database maps this functionality by default to the Ctrl+Alt+Numpad * key combination.
Impact :

A physically proximate attacker could exploit this vulnerability to gain access to a locked X session without providing the correct credentials.
Workaround :

Downgrade to any version of x11-base/xorg-server below x11-base/xorg-server-1.11:
# emerge --oneshot --verbose '<x11-base/xorg-server-1.11'


All xkeyboard-config users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=x11-misc/xkeyboard-config-2.4.1-r3' NOTE: The X.Org X Server 1.11 was only stable on the AMD64, ARM, HPPA, and x86 architectures. Users of the stable branches of all other architectures are not affected and will be directly provided with a fixed X Keyboard Configuration Database version.

See Also

Plugin Details

Severity: Medium

ID: 57722

File Name: gentoo_GLSA-201201-16.nasl

Version: $Revision: 1.7 $

Type: local

Published: 2012/01/30

Modified: 2016/05/16

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 4.6

Temporal Score: 4

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:xkeyboard-config, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list, Host/Gentoo/arch

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2012/01/27

Reference Information

CVE: CVE-2012-0064

BID: 51562

OSVDB: 78445

GLSA: 201201-16