<?xml version="1.0" encoding="utf-8"?> <!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>