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Gentoo Linux Security Advisory GLSA 201201-16 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: X.Org X Server/X Keyboard Configuration Database: Screen lock |
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bypass |
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Date: January 27, 2012 |
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Bugs: #399347 |
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ID: 201201-16 |
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Synopsis |
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======== |
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|
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A debugging functionality in the X.Org X Server that is bound to a |
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hotkey by default can be used by local attackers to circumvent screen |
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locking utilities. |
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Background |
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========== |
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|
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The X Keyboard Configuration Database provides keyboard configuration |
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for various X server implementations. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 x11-misc/xkeyboard-config |
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< 2.4.1-r3 >= 2.4.1-r3 |
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------------------------------------------------------------------- |
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# Package 1 only applies to users of these architectures: |
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amd64, arm, hppa, x86 |
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|
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Description |
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=========== |
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|
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Starting with the =x11-base/xorg-server-1.11 package, the X.Org X |
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Server again provides debugging functionality that can be used |
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terminate an application that exclusively grabs mouse and keyboard |
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input, like screen locking utilities. |
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|
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Gu1 reported that the X Keyboard Configuration Database maps this |
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functionality by default to the Ctrl+Alt+Numpad * key combination. |
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|
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Impact |
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====== |
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|
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A physically proximate attacker could exploit this vulnerability to |
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gain access to a locked X session without providing the correct |
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credentials. |
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|
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Workaround |
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========== |
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Downgrade to any version of x11-base/xorg-server below |
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x11-base/xorg-server-1.11: |
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# emerge --oneshot --verbose "<x11-base/xorg-server-1.11" |
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Resolution |
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========== |
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All xkeyboard-config users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot -v ">=x11-misc/xkeyboard-config-2.4.1-r3" |
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|
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NOTE: The X.Org X Server 1.11 was only stable on the AMD64, ARM, HPPA, |
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and x86 architectures. Users of the stable branches of all other |
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architectures are not affected and will be directly provided with a |
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fixed X Keyboard Configuration Database version. |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2012-0064 |
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http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-0064 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-201201-16.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2012 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |
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