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<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet href="/xsl/glsa.xsl" type="text/xsl"?>
<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200909-19">
<title>Dnsmasq: Multiple vulnerabilities</title>
<synopsis>
Multiple vulnerabilities in Dnsmasq might result in the remote execution of
arbitrary code, or a Denial of Service.
</synopsis>
<product type="ebuild">dnsmasq</product>
<announced>September 20, 2009</announced>
<revised>September 20, 2009: 01</revised>
<bug>282653</bug>
<access>remote</access>
<affected>
<package name="net-dns/dnsmasq" auto="yes" arch="*">
<unaffected range="ge">2.5.0</unaffected>
<vulnerable range="lt">2.5.0</vulnerable>
</package>
</affected>
<background>
<p>
Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP
server. It includes support for Trivial FTP (TFTP).
</p>
</background>
<description>
<p>
Multiple vulnerabilities have been reported in the TFTP functionality
included in Dnsmasq:
</p>
<ul>
<li>Pablo Jorge and Alberto Solino
discovered a heap-based buffer overflow (CVE-2009-2957).</li>
<li>An
anonymous researcher reported a NULL pointer reference
(CVE-2009-2958).</li>
</ul>
</description>
<impact type="normal">
<p>
A remote attacker in the local network could exploit these
vulnerabilities by sending specially crafted TFTP requests to a machine
running Dnsmasq, possibly resulting in the remote execution of
arbitrary code with the privileges of the user running the daemon, or a
Denial of Service. NOTE: The TFTP server is not enabled by default.
</p>
</impact>
<workaround>
<p>
You can disable the TFTP server either at buildtime by not enabling the
"tftp" USE flag, or at runtime. Make sure "--enable-tftp" is not set in
the DNSMASQ_OPTS variable in the /etc/conf.d/dnsmasq file and
"enable-tftp" is not set in /etc/dnsmasq.conf, either of which would
enable TFTP support if it is compiled in.
</p>
</workaround>
<resolution>
<p>
All Dnsmasq users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.5.0"</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2957">CVE-2009-2957</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2958">CVE-2009-2958</uri>
</references>
<metadata tag="submitter" timestamp="Tue, 01 Sep 2009 10:28:12 +0000">
a3li
</metadata>
<metadata tag="bugReady" timestamp="Sun, 20 Sep 2009 18:56:49 +0000">
a3li
</metadata>
</glsa>
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