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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200909-13">
<title>irssi: Execution of arbitrary code</title>
<synopsis>
A remotely exploitable off-by-one error leading to a heap overflow was
found in irssi which might result in the execution of arbitrary code.
</synopsis>
<product type="ebuild">irssi</product>
<announced>September 12, 2009</announced>
<revised>September 12, 2009: 01</revised>
<bug>271875</bug>
<access>remote</access>
<affected>
<package name="net-irc/irssi" auto="yes" arch="*">
<unaffected range="ge">0.8.13-r1</unaffected>
<vulnerable range="lt">0.8.13-r1</vulnerable>
</package>
</affected>
<background>
<p>
irssi is a modular textUI IRC client with IPv6 support.
</p>
</background>
<description>
<p>
Nemo discovered an off-by-one error leading to a heap overflow in
irssi's event_wallops() parsing function.
</p>
</description>
<impact type="high">
<p>
A remote attacker might entice a user to connect to a malicious IRC
server, use a man-in-the-middle attack to redirect a user to such a
server or use ircop rights to send a specially crafted WALLOPS message,
which might result in the execution of arbitrary code with the
privileges of the user running irssi.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All irssi users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-irc/irssi-0.8.13-r1&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1959">CVE-2009-1959</uri>
</references>
<metadata tag="requester" timestamp="Wed, 10 Jun 2009 19:45:21 +0000">
a3li
</metadata>
<metadata tag="submitter" timestamp="Thu, 02 Jul 2009 19:15:53 +0000">
craig
</metadata>
<metadata tag="bugReady" timestamp="Sat, 12 Sep 2009 16:10:35 +0000">
craig
</metadata>
</glsa>