Detections
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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
Plugin Details
Severity: Medium
ID: 35347
File Name: gentoo_GLSA-200901-03.nasl
Version: 1.32
Type: local
Family: Gentoo Local Security Checks
Published: 1/12/2009
Updated: 1/6/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.0
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.9
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
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: 1/11/2009
Reference Information
CVE: CVE-2008-1447, CVE-2008-4194
BID: 30131