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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200611-01">
<title>Screen: UTF-8 character handling vulnerability</title>
<synopsis>
Screen contains an error in its UTF-8 character handling code that would
allow a remote Denial of Service or possibly the remote execution of
arbitrary code.
</synopsis>
<product type="ebuild">screen</product>
<announced>2006-11-03</announced>
<revised>2006-11-03: 01</revised>
<bug>152770</bug>
<access>remote</access>
<affected>
<package name="app-misc/screen" auto="yes" arch="*">
<unaffected range="ge">4.0.3</unaffected>
<vulnerable range="lt">4.0.3</vulnerable>
</package>
</affected>
<background>
<p>
Screen is a full-screen window manager that multiplexes a physical
terminal between several processes, typically interactive shells.
</p>
</background>
<description>
<p>
cstone and Richard Felker discovered a flaw in Screen's UTF-8 combining
character handling.
</p>
</description>
<impact type="high">
<p>
The vulnerability can be exploited by writing a special string of
characters to a Screen window. A remote attacker could cause a Denial
of Service or possibly execute arbitrary code with the privileges of
the user running Screen through a program being run inside a Screen
session, such as an IRC client or a mail client.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All Screen users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-misc/screen-4.0.3"</code>
</resolution>
<references>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4573">CVE-2006-4573</uri>
</references>
<metadata tag="submitter" timestamp="2006-10-27T12:01:54Z">
aetius
</metadata>
<metadata tag="bugReady" timestamp="2006-10-30T11:11:00Z">
falco
</metadata>
</glsa>
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