bind, caching security update

2010-01-20T17:59:57
ID CESA-2010:0062
Type centos
Reporter CentOS Project
Modified 2010-01-20T17:59:57

Description

CentOS Errata and Security Advisory CESA-2010:0062

The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.

A flaw was found in the BIND DNSSEC NSEC/NSEC3 validation code. If BIND was running as a DNSSEC-validating resolver, it could incorrectly cache NXDOMAIN responses, as if they were valid, for records proven by NSEC or NSEC3 to exist. A remote attacker could use this flaw to cause a BIND server to return the bogus, cached NXDOMAIN responses for valid records and prevent users from retrieving those records (denial of service). (CVE-2010-0097)

The original fix for CVE-2009-4022 was found to be incomplete. BIND was incorrectly caching certain responses without performing proper DNSSEC validation. CNAME and DNAME records could be cached, without proper DNSSEC validation, when received from processing recursive client queries that requested DNSSEC records but indicated that checking should be disabled. A remote attacker could use this flaw to bypass the DNSSEC validation check and perform a cache poisoning attack if the target BIND server was receiving such client queries. (CVE-2010-0290)

All BIND users are advised to upgrade to these updated packages, which contain a backported patch to resolve these issues. After installing the update, the BIND daemon (named) will be restarted automatically.

Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2010-January/016477.html http://lists.centos.org/pipermail/centos-announce/2010-January/016478.html

Affected packages: bind bind-chroot bind-devel bind-libbind-devel bind-libs bind-sdb bind-utils caching-nameserver

Upstream details at: