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TITLE:
dnsmasq Denial of Service and DNS Cache Poisoning

SECUNIA ADVISORY ID:
SA31197

VERIFY ADVISORY:
http://secunia.com/advisories/31197/

CRITICAL:
Moderately critical

IMPACT:
Spoofing, DoS

WHERE:
>From remote

SOFTWARE:
Dnsmasq 2.x
http://secunia.com/product/4837/

DESCRIPTION:
Some vulnerabilities have been reported in dnsmasq, which can be
exploited by malicious people to cause a DoS (Denial of Service) and
poison the DNS cache.

1) A vulnerability is caused due to dnsmasq not sufficiently
randomising the DNS transaction ID and the source port number, which
can be exploited to poison the DNS cache.

2) An error when an unknown client tries to renew a DHCP lease can be
exploited to crash the service.

Note: Additionally, an error within the netlink code and a potential
crash when a host without a lease performs a DHCPINFORM have been
reported in version 2.43.

Vulnerability #1 is reported in versions prior to 2.43, vulnerability
#2 is reported in version 2.43.

SOLUTION:
Update to version 2.45.

PROVIDED AND/OR DISCOVERED BY:
1) Dan Kaminsky, IOActive
2) The vendor thanks Carlos Carvalho

ORIGINAL ADVISORY:
dnsmasq release announcements:
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2156
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2189
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2199

Vendor statement regarding DNS cache poisoning:
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2176

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About:
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