--nextPart1730380.bKA0QACqZf
Content-Type: Text/Plain;
  charset="us-ascii
Content-Transfer-Encoding: quoted-printable

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 201201-16
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 Severity: Normal
    Title: X.Org X Server/X Keyboard Configuration Database: Screen lock
           bypass
     Date: January 27, 2012
     Bugs: #399347
       ID: 201201-16

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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

Description
===========

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"

Resolution
==========

All xkeyboard-config users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot -v ">=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.

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:

 http://security.gentoo.org/glsa/glsa-201201-16.xml

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.

License
=======

Copyright 2012 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

--nextPart1730380.bKA0QACqZf
Content-Type: application/pgp-signature; name=signature.asc 
Content-Description: This is a digitally signed message part.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.18 (GNU/Linux)

iQIcBAABCAAGBQJPIx5VAAoJEDa6ZWES7jAAkCUQAKdAx2aVkQQi6+ilJK3lfdFy
g4bH18qpFcof6Y6YKpa0NlbXy1IlxctbY//8FyQTl3gtZLtzyKH7sBhhCoO044kg
XcO8F8wG6HzX0hA16+tEokaFmCTmk+ipvtOuelWzoKX4BwREu7D4e1DlqwvDK0Ma
lpGTOQOB6bw6215gwiyHoDIwfq3Hu6M9jG8INQpRjFZ51AxS4wpYqwWUBlcCjfV5
Cxg8OeZg/rm0wiSK8SHI3B5pbBvEf/996sDHCjXzepQHfDvZ7Jnh95H6D0nmVjeR
AgHPtbb3QKBMBYbBsAECfh5PiWdNzo1Zo43P870i4QHzP1Up+H1gXrPs3en0T3v8
mvrCFUjdT0N4icNuZfYE+C3WwCWE6z/7kok4qO/ryw07BevGWbI7nXvmLGF5LEDk
i1hQ1POIKCc3eyUqnST69Wd2PzB5YKeiYf6EjAltfn3G1xb8IORYu0sKnBjyZHSh
EpX6foc4/SLaJA8SbXomVo2cVkCwzkql/ozJCJyOStz10jEpLrySRw2MrdGgOI7+
qTlLxEZbwlig+VQbMTPyK5rvlmoGJyFWFYnGMlds+pWtswK3Q7MBoY4hZgs6cFHA
vD2mzI/vpp7H089y9Fhjou7vPlvwQshdDGstMJMxv8+mqnnTsS/18bB7HEex9cQr
1FcncRUWAnsOqQ1yxet8
=uxCR
-----END PGP SIGNATURE-----

--nextPart1730380.bKA0QACqZf--