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

Medium Nessus Plugin ID 35347

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.

Solution

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

See Also

https://security.gentoo.org/glsa/200901-03

Plugin Details

Severity: Medium

ID: 35347

File Name: gentoo_GLSA-200901-03.nasl

Version: 1.31

Type: local

Published: 2009/01/12

Updated: 2019/08/02

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:pdnsd, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2009/01/11

Reference Information

CVE: CVE-2008-1447, CVE-2008-4194

BID: 30131

GLSA: 200901-03

IAVA: 2008-A-0045

CWE: 399