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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202105-11">
<title>GNU Screen: User-assisted execution of arbitrary code</title>
<synopsis>A vulnerability in GNU screen may allow a remote attacker to
execute arbitrary code.
</synopsis>
<product type="ebuild">screen</product>
<announced>2021-05-26</announced>
<revised count="1">2021-05-26</revised>
<bug>769770</bug>
<access>local, remote</access>
<affected>
<package name="app-misc/screen" auto="yes" arch="*">
<unaffected range="ge">4.8.0-r2</unaffected>
<vulnerable range="lt">4.8.0-r2</vulnerable>
</package>
</affected>
<background>
<p>GNU Screen is a full-screen window manager that multiplexes a physical
terminal between several processes, typically interactive shells.
</p>
</background>
<description>
<p>It was discovered that GNU screen did not properly handle certain UTF-8
character sequences.
</p>
</description>
<impact type="normal">
<p>A remote attacker could entice a user to run a program where attacker
controls the output inside a GNU screen session, possibly resulting in
execution of arbitrary code with the privileges of the process or a
Denial of Service condition.
</p>
</impact>
<workaround>
<p>This vulnerability can be mitigated by disabling UTF-8 processing in
.screenrc.
</p>
</workaround>
<resolution>
<p>All GNU screen users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-misc/screen-4.8.0-r2"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/vuln/detail/CVE-2021-26937">CVE-2021-26937</uri>
</references>
<metadata tag="requester" timestamp="2021-05-25T21:07:51Z">whissi</metadata>
<metadata tag="submitter" timestamp="2021-05-26T08:14:58Z">whissi</metadata>
</glsa>
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