[ GLSA 200609-11 ] BIND: Denial of Service

[GLSA]

Gentoo Linux Security Advisory

Title: BIND: Denial of Service (GLSA 200609-11)
Severity: normal
Exploitable: remote
Date: September 15, 2006
Bug(s): #146486
ID: 200609-11

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: net-dns/bind
Vulnerable: < 9.3.2-r4
Unaffected: >= 9.3.2-r4
Unaffected: >= 9.2.6-r4 < 9.2.7
Architectures: All supported architectures


Description

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.

Impact

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.

Workaround

There are no known workarounds at this time.

Resolution

All BIND 9.3 users should update to the latest version: