GLSA-200901-03 : pdnsd: Denial of Service and cache poisoning

This script is Copyright (C) 2009-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-200901-03
(pdnsd: Denial of Service and cache poisoning)

Two issues have been reported in pdnsd:
The p_exec_query() function in src/dns_query.c does not properly handle
many entries in the answer section of a DNS reply, related to a
'dangling pointer bug' (CVE-2008-4194).
The default value for query_port_start was set to 0, disabling UDP
source port randomization for outgoing queries (CVE-2008-1447).

Impact :

An attacker could exploit the second weakness to poison the cache of
pdnsd and thus spoof DNS traffic, which could e.g. lead to the
redirection of web or mail traffic to malicious sites. The first issue
can be exploited by enticing pdnsd to send a query to a malicious DNS
server, or using the port randomization weakness, and might lead to a
Denial of Service.

Workaround :

Port randomization can be enabled by setting the 'query_port_start'
option to 1024 which would resolve the CVE-2008-1447 issue.

See also :

http://www.gentoo.org/security/en/glsa/glsa-200901-03.xml

Solution :

All pdnsd users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=net-dns/pdnsd-1.2.7'

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P)
CVSS Temporal Score : 5.3
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 35347 (gentoo_GLSA-200901-03.nasl)

Bugtraq ID: 30131

CVE ID: CVE-2008-1447
CVE-2008-4194