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

medium Nessus Plugin ID 57722

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Synopsis

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

Description

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'

Solution

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

https://security.gentoo.org/glsa/201201-16

Plugin Details

Severity: Medium

ID: 57722

File Name: gentoo_GLSA-201201-16.nasl

Version: 1.10

Type: local

Published: 1/30/2012

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

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 Ease: No known exploits are available

Patch Publication Date: 1/27/2012

Reference Information

CVE: CVE-2012-0064

BID: 51562

GLSA: 201201-16