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BIND: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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.


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


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.


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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