glsa-200907-13.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200907-13">
  <title>PulseAudio: Local privilege escalation</title>
  <synopsis>
    A vulnerability in PulseAudio may allow a local user to execute code with
    escalated privileges.
  </synopsis>
  <product type="ebuild">pulseaudio</product>
  <announced>July 16, 2009</announced>
  <revised>July 16, 2009: 01</revised>
  <bug>276986</bug>
  <access>local</access>
  <affected>
    <package name="media-sound/pulseaudio" auto="yes" arch="*">
      <unaffected range="ge">0.9.9-r54</unaffected>
      <vulnerable range="lt">0.9.9-r54</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    PulseAudio is a network-enabled sound server with an advanced plug-in
    system.
    </p>
  </background>
  <description>
    <p>
    Tavis Ormandy and Julien Tinnes of the Google Security Team discovered
    that the pulseaudio binary is installed setuid root, and does not drop
    privileges before re-executing itself. The vulnerability has
    independently been reported to oCERT by Yorick Koster.
    </p>
  </description>
  <impact type="high">
    <p>
    A local user who has write access to any directory on the file system
    containing /usr/bin can exploit this vulnerability using a race
    condition to execute arbitrary code with root privileges.
    </p>
  </impact>
  <workaround>
    <p>
    Ensure that the file system holding /usr/bin does not contain
    directories that are writable for unprivileged users.
    </p>
  </workaround>
  <resolution>
    <p>
    All PulseAudio users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=media-sound/pulseaudio-0.9.9-r54&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1894">CVE-2009-1894</uri>
  </references>
  <metadata tag="requester" timestamp="Thu, 09 Jul 2009 16:33:42 +0000">
    rbu
  </metadata>
  <metadata tag="submitter" timestamp="Thu, 09 Jul 2009 16:51:52 +0000">
    rbu
  </metadata>
  <metadata tag="bugReady" timestamp="Thu, 16 Jul 2009 14:13:15 +0000">
    rbu
  </metadata>
</glsa>