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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202101-21">
<title>Flatpak: Sandbox escape</title>
<synopsis>A vulnerability was discovered in Flatpak which could allow a
remote attacker to execute arbitrary code.
</synopsis>
<product type="ebuild">flatpak</product>
<announced>2021-01-25</announced>
<revised count="1">2021-01-25</revised>
<bug>765457</bug>
<access>remote</access>
<affected>
<package name="sys-apps/flatpak" auto="yes" arch="*">
<unaffected range="ge">1.10.0</unaffected>
<vulnerable range="lt">1.10.0</vulnerable>
</package>
</affected>
<background>
<p>Flatpak is a Linux application sandboxing and distribution framework.</p>
</background>
<description>
<p>A bug was discovered in the flatpak-portal service that can allow
sandboxed applications to execute arbitrary code on the host system (a
sandbox escape).
</p>
</description>
<impact type="normal">
<p>A remote attacker could entice a user to open a specially crafted
Flatpak app possibly resulting in execution of arbitrary code with the
privileges of the process or a Denial of Service condition.
</p>
</impact>
<workaround>
<p>As a workaround, this vulnerability can be mitigated by preventing the
flatpak-portal service from starting, but that mitigation will prevent
many Flatpak apps from working correctly. It is highly recommended to
upgrade.
</p>
</workaround>
<resolution>
<p>All Flatpak users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose "&gt;=sys-apps/flatpak-1.10.0"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/vuln/detail/CVE-2021-21261">CVE-2021-21261</uri>
</references>
<metadata tag="requester" timestamp="2021-01-22T00:26:55Z">sam_c</metadata>
<metadata tag="submitter" timestamp="2021-01-25T00:07:24Z">b-man</metadata>
</glsa>