BIND: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200702-06 / bind
Release Date	February 17, 2007
Latest Revision	February 17, 2007: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-dns/bind	< 9.3.4	>= 9.3.4, revision >= 9.2.8	All supported architectures

Related bugreports: #163692

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

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:

Code Listing 3.1: Resolution

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

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

Code Listing 3.2: Resolution

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

4. References

Page updated February 17, 2007

Summary: This is a Gentoo Linux Security Advisory

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