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BIND: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200609-11 / bind
Release Date September 15, 2006
Latest Revision September 15, 2006: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-dns/bind < 9.3.2-r4 >= 9.3.2-r4, revision >= 9.2.6-r4 All supported architectures

Related bugreports: #146486


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.


Queries for SIG records will cause an assertion error if more than one SIG RRset is returned. Additionally, an INSIST failure can be triggered by sending multiple recursive queries if the response to the query arrives after all the clients looking for the response have left the recursion queue.


An attacker having access to a recursive server can crash the server by querying the SIG records where there are multiple SIG RRsets, or by sending many recursive queries in a short time. The exposure can be lowered by restricting the clients that can ask for recursion. An attacker can also crash an authoritative server serving a DNSSEC zone in which there are multiple SIG RRsets.

3.  Resolution Information


There are no known workarounds at this time.


All BIND 9.3 users should update to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/bind-9.3.2-r4"

All BIND 9.2 users should update to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/bind-9.2.6-r4"

4.  References


Page updated September 15, 2006

Summary: This is a Gentoo Linux Security Advisory

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