GLSA 200702-06: BIND: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	BIND: Denial of Service
Date:	02/17/2007
Bugs:	#163692
ID:	200702-06

Synopsis

ISC BIND contains two vulnerabilities allowing a Denial of Service under certain conditions.

Background

ISC BIND is the Internet Systems Consortium implementation of the Domain Name System (DNS) protocol.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-dns/bind	< 9.3.4	>= 9.3.4	All supported architectures

Description

An unspecified improper usage of an already freed context has been reported. Additionally, an assertion error could be triggered in the DNSSEC validation of some responses to type ANY queries with multiple RRsets.

Impact

A remote attacker could crash the server through unspecified vectors or, if DNSSEC validation is enabled, by sending certain crafted ANY queries.

Workaround

There is no known workaround at this time for the first issue. The DNSSEC validation Denial of Service can be prevented by disabling DNSSEC validation until the upgrade to a fixed version. Note that DNSSEC validation is disabled on a default configuration.

Resolution

All ISC BIND 9.3 users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/bind-9.3.4"

All ISC BIND 9.2 users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/bind-9.2.8"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200702-06.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.