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TITLE:
Dnsmasq Denial of Service and Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA36394

VERIFY ADVISORY:
http://secunia.com/advisories/36394/

DESCRIPTION:
Some vulnerabilities have been reported in Dnsmasq, which can be
exploited by malicious people to cause a DoS (Denial of Service) and
potentially compromise a vulnerable system.

1) A boundary error within the "tftp_request()" function in
src/tftp.c can be exploited to cause a heap-based buffer overflow by
sending specially crafted requests to the server.

2) A NULL pointer dereference error within the "tftp_request()"
function in src/ftpd.c can be exploited to cause a crash by sending a
specially crafted request to the server.

Successful exploitation of both vulnerabilities requires that Dnsmasq
is compiled with TFTP support. Successful exploitation of
vulnerability #1 also requires that Dnsmasq is configured with a long
directory prefix.

The vulnerability is reported in versions prior to 2.50.

SOLUTION:
Update to version 2.50.
http://www.thekelleys.org.uk/dnsmasq/

PROVIDED AND/OR DISCOVERED BY:
1) Pablo Jorge and Alberto Soliņo, Core Security Technologies
2) Steve Grubb, Red Hat

ORIGINAL ADVISORY:
Dnsmasq:
http://www.thekelleys.org.uk/dnsmasq/CHANGELOG

Core Security Technologies:
http://www.coresecurity.com/content/dnsmasq-vulnerabilities

Red Hat:
https://rhn.redhat.com/errata/RHSA-2009-1238.html

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