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Gentoo Linux Security Advisory GLSA 200907-13 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: PulseAudio: Local privilege escalation |
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Date: July 16, 2009 |
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Bugs: #276986 |
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ID: 200907-13 |
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Synopsis |
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======== |
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|
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A vulnerability in PulseAudio may allow a local user to execute code |
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with escalated privileges. |
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Background |
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========== |
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|
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PulseAudio is a network-enabled sound server with an advanced plug-in |
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system. |
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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 media-sound/pulseaudio < 0.9.9-r54 >= 0.9.9-r54 |
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|
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Description |
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=========== |
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|
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Tavis Ormandy and Julien Tinnes of the Google Security Team discovered |
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that the pulseaudio binary is installed setuid root, and does not drop |
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privileges before re-executing itself. The vulnerability has |
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independently been reported to oCERT by Yorick Koster. |
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|
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Impact |
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====== |
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|
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A local user who has write access to any directory on the file system |
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containing /usr/bin can exploit this vulnerability using a race |
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condition to execute arbitrary code with root privileges. |
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|
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Workaround |
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========== |
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Ensure that the file system holding /usr/bin does not contain |
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directories that are writable for unprivileged users. |
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|
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Resolution |
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========== |
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All PulseAudio users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot -v ">=media-sound/pulseaudio-0.9.9-r54" |
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|
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References |
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========== |
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[ 1 ] CVE-2009-1894 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1894 |
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|
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Availability |
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============ |
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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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|
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http://security.gentoo.org/glsa/glsa-200907-13.xml |
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|
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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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http://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2009 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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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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http://creativecommons.org/licenses/by-sa/2.5 |
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