glsa-201702-21.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201702-21">
  <title>Opus: User-assisted execution of arbitrary code</title>
  <synopsis>A vulnerability in Opus could cause memory corruption.</synopsis>
  <product type="ebuild">opus</product>
  <announced>2017-02-20</announced>
  <revised count="1">2017-02-20</revised>
  <bug>605894</bug>
  <access>remote</access>
  <affected>
    <package name="media-libs/opus" auto="yes" arch="*">
      <unaffected range="ge">1.1.3-r1</unaffected>
      <vulnerable range="lt">1.1.3-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>Opus is a totally open, royalty-free, highly versatile audio codec.</p>
  </background>
  <description>
    <p>A large NLSF values could cause the stabilization code in
      silk/NLSF_stabilize.c to wrap-around and have the last value in
      NLSF_Q15[] to be negative, close to -32768.
    </p>
    
    <p>Under normal circumstances, the code will simply read from the wrong
      table resulting in an unstable LPC filter. The filter would then go
      through the LPC stabilization code at the end of silk_NLSF2A().
    </p>
    
    <p>Ultimately, the output audio would be garbage, but no worse than with
      any other harmless bad packet.
    </p>
    
    <p>Please see the referenced upstream patch and Debian bug report below for
      a detailed analysis.
    </p>
    
    <p>However, the original report was about a successful exploitation of
      Android’s Mediaserver in conjunction with this vulnerability.
    </p>
  </description>
  <impact type="normal">
    <p>A remote attacker could entice a user to open a specially crafted media
      stream, possibly resulting in execution of arbitrary code with the
      privileges of the process, or a Denial of Service condition.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All Opus users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=media-libs/opus-1.1.3-r1"
    </code>
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-0381">CVE-2017-0381</uri>
    <uri link="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851612#10">
      Debian Bug 851612
    </uri>
    <uri link="https://git.xiph.org/?p=opus.git;a=commitdiff;h=70a3d641b">
      Upstream patch
    </uri>
  </references>
  <metadata tag="requester" timestamp="2017-02-16T12:24:20Z">whissi</metadata>
  <metadata tag="submitter" timestamp="2017-02-20T23:45:02Z">whissi</metadata>
</glsa>