GLSA Advocate
Joined: 12 May 2004 Posts: 2663
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Posted: Sun Sep 20, 2009 7:26 pm Post subject: [ GLSA 200909-19 ] Dnsmasq: Multiple vulnerabilities |
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Gentoo Linux Security Advisory
Title: Dnsmasq: Multiple vulnerabilities (GLSA 200909-19)
Severity: normal
Exploitable: remote
Date: September 20, 2009
Bug(s): #282653
ID: 200909-19
Synopsis
Multiple vulnerabilities in Dnsmasq might result in the remote execution of
arbitrary code, or a Denial of Service.
Background
Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP
server. It includes support for Trivial FTP (TFTP).
Affected Packages
Package: net-dns/dnsmasq
Vulnerable: < 2.5.0
Unaffected: >= 2.5.0
Architectures: All supported architectures
Description
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).
Impact
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.
Workaround
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.
Resolution
All Dnsmasq users should upgrade to the latest version:
Code: | # emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.5.0" |
References
CVE-2009-2957
CVE-2009-2958
Last edited by GLSA on Sun Nov 22, 2009 4:29 am; edited 1 time in total |
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