GLSA-200908-02 : BIND: Denial of Service

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-200908-02
(BIND: Denial of Service)

Matthias Urlichs reported that the dns_db_findrdataset() function fails
when the prerequisite section of the dynamic update message contains a
record of type 'ANY' and where at least one RRset for this FQDN exists
on the server.

Impact :

A remote unauthenticated attacker could send a specially crafted
dynamic update message to the BIND daemon (named), leading to a Denial
of Service (daemon crash). This vulnerability affects all primary
(master) servers -- it is not limited to those that are configured to
allow dynamic updates.

Workaround :

Configure a firewall that performs Deep Packet Inspection to prevent
nsupdate messages from reaching named. Alternatively, expose only
secondary (slave) servers to untrusted networks.

See also :

https://www.isc.org/node/474
http://www.gentoo.org/security/en/glsa/glsa-200908-02.xml

Solution :

All BIND users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=net-dns/bind-9.4.3_p3'

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 3.6
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 40463 (gentoo_GLSA-200908-02.nasl)

Bugtraq ID: 35848

CVE ID: CVE-2009-0696