Scientific Linux Security Update : bind on SL5.x i386/x86_64
Medium Nessus Plugin ID 60726
SynopsisThe remote Scientific Linux host is missing one or more security updates.
DescriptionCVE-2010-0097 BIND DNSSEC NSEC/NSEC3 validation code could cause bogus NXDOMAIN responses
CVE-2010-0290 BIND upstream fix for CVE-2009-4022 is incomplete
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.
After installing the update, the BIND daemon (named) will be restarted automatically.
SolutionUpdate the affected packages.