Dnsmasq: Multiple vulnerabilities

Dnsmasq: Multiple vulnerabilities Multiple vulnerabilities in Dnsmasq might result in the remote execution of arbitrary code, or a Denial of Service. dnsmasq 2009-09-20 2009-09-20 282653 remote 2.5.0 2.5.0

Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server. It includes support for Trivial FTP (TFTP).

Multiple vulnerabilities have been reported in the TFTP functionality included in Dnsmasq:

Pablo Jorge and Alberto Solino discovered a heap-based buffer overflow (CVE-2009-2957).
An anonymous researcher reported a NULL pointer reference (CVE-2009-2958).

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.

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.

All Dnsmasq users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.5.0"

CVE-2009-2957 CVE-2009-2958 a3li a3li