<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202011-07">
  <title>Mozilla Firefox: Remote code execution</title>
  <synopsis>A use-after-free in Mozilla Firefox might allow remote attacker(s)
    to execute arbitrary code.
  </synopsis>
  <product type="ebuild">firefox</product>
  <announced>2020-11-11</announced>
  <revised count="1">2020-11-11</revised>
  <bug>753773</bug>
  <access>remote</access>
  <affected>
    <package name="www-client/firefox" auto="yes" arch="*">
      <unaffected range="ge">82.0.3</unaffected>
      <unaffected range="ge" slot="0/esr78">78.4.1</unaffected>
      <vulnerable range="lt">82.0.3</vulnerable>
    </package>
    <package name="www-client/firefox-bin" auto="yes" arch="*">
      <unaffected range="ge">82.0.3</unaffected>
      <unaffected range="ge" slot="0/esr78">78.4.1</unaffected>
      <vulnerable range="lt">78.4.1</vulnerable>
    </package>
  </affected>
  <background>
    <p>Mozilla Firefox is a popular open-source web browser from the Mozilla
      project.
    </p>
  </background>
  <description>
    <p>Invalid assumptions when emitting the the MCallGetProperty opcode in the
      JavaScript JIT may result in a use-after-free condition.
    </p>
  </description>
  <impact type="normal">
    <p>A remote attacker could possibly execute arbitrary code with the
      privileges of the process, or cause a Denial of Service condition.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All Mozilla Firefox users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=www-client/firefox-82.0.3"
    </code>
    
    <p>All Mozilla Firefox (bin) users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose
      "&gt;=www-client/firefox-bin-78.4.1:0/esr78"
    </code>
    
    <p>All Mozilla Firefox (ESR) users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=www-client/firefox-82.0.3"
    </code>
    
    <p>All Mozilla Firefox (ESR) bin users should upgrade to the latest
      version:
    </p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose
      "&gt;=www-client/firefox-bin-78.4.1:0/esr78"
    </code>
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2020-26950">CVE-2020-26950</uri>
    <uri link="https://www.mozilla.org/en-US/security/advisories/mfsa2020-49/">
      MFSA-2020-49
    </uri>
  </references>
  <metadata tag="requester" timestamp="2020-11-09T20:03:19Z">sam_c</metadata>
  <metadata tag="submitter" timestamp="2020-11-11T03:36:43Z">sam_c</metadata>
</glsa>
