Gentoo: GLSA-201201-16: X.Org X Server/X Keyboard Configuration Database: Screen lock bypass
Summary
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.
Resolution
References
[ 1 ] CVE-2012-0064 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0064
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201201-16
Concerns
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
![Dist Gentoo](/images/distros/dist-gentoo.png)
Synopsis
A debugging functionality in the X.Org X Server that is bound to a hotkey by default can be used by local attackers to circumvent screen locking utilities.
Background
The X Keyboard Configuration Database provides keyboard configuration for various X server implementations.
Affected Packages
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 x11-misc/xkeyboard-config < 2.4.1-r3 >= 2.4.1-r3 ------------------------------------------------------------------- # Package 1 only applies to users of these architectures: amd64, arm, hppa, x86
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 "
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.