Dnsmasq: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200909-19 / dnsmasq
||September 20, 2009
||September 20, 2009: 01
All supported architectures
Multiple vulnerabilities in Dnsmasq might result in the remote execution of
arbitrary code, or a Denial of Service.
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).
anonymous researcher reported a NULL pointer reference
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:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.5.0"