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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200610-15">
<title>Asterisk: Multiple vulnerabilities</title>
<synopsis>
Asterisk is vulnerable to the remote execution of arbitrary code or a
Denial of Service.
</synopsis>
<product type="ebuild">asterisk</product>
<announced>October 30, 2006</announced>
<revised>January 30, 2007: 02</revised>
<bug>144941</bug>
<bug>151881</bug>
<access>remote</access>
<affected>
<package name="net-misc/asterisk" auto="yes" arch="*">
<unaffected range="ge">1.2.13</unaffected>
<unaffected range="rge">1.0.12</unaffected>
<vulnerable range="lt">1.2.13</vulnerable>
<vulnerable range="lt">1.0.12</vulnerable>
</package>
</affected>
<background>
<p>
Asterisk is an open source implementation of a telephone private branch
exchange (PBX).
</p>
</background>
<description>
<p>
Asterisk contains buffer overflows in channels/chan_mgcp.c from the
MGCP driver and in channels/chan_skinny.c from the Skinny channel
driver for Cisco SCCP phones. It also dangerously handles
client-controlled variables to determine filenames in the Record()
function. Finally, the SIP channel driver in channels/chan_sip.c could
use more resources than necessary under unspecified circumstances.
</p>
</description>
<impact type="high">
<p>
A remote attacker could execute arbitrary code by sending a crafted
audit endpoint (AUEP) response, by sending an overly large Skinny
packet even before authentication, or by making use of format strings
specifiers through the client-controlled variables. An attacker could
also cause a Denial of Service by resource consumption through the SIP
channel driver.
</p>
</impact>
<workaround>
<p>
There is no known workaround for the format strings vulnerability at
this time. You can comment the lines in /etc/asterisk/mgcp.conf,
/etc/asterisk/skinny.conf and /etc/asterisk/sip.conf to deactivate the
three vulnerable channel drivers. Please note that the MGCP channel
driver is disabled by default.
</p>
</workaround>
<resolution>
<p>
All Asterisk users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.13"</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4345">CVE-2006-4345</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4346">CVE-2006-4346</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5444">CVE-2006-5444</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5445">CVE-2006-5445</uri>
</references>
<metadata tag="submitter" timestamp="Wed, 18 Oct 2006 20:57:57 +0000">
falco
</metadata>
<metadata tag="bugReady" timestamp="Sat, 21 Oct 2006 20:37:32 +0000">
falco
</metadata>
</glsa>
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