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<?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 ">=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
">=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 ">=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
">=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>
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