| <?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> |