Posting date: 19 Jan 2010
9.0.x, 9.1.x, 9.2.x, 9.3.x, 9.4.0 -> 9.4.3-P4, 9.5.0 -> 9.5.2-P1, 9.6.0 -> 9.6.1-P2
There was an error in the DNSSEC NSEC/NSEC3
validation code that could cause bogus NXDOMAIN responses (that is,
NXDOMAIN responses for records proven by NSEC or NSEC3 to exist) to be
cached as if they had validated correctly, so that future queries to the
resolver would return the bogus NXDOMAIN with the AD flag set.
problem affects all DNSSEC-validating resolvers. It would be difficult
to exploit due to other existing protections against cache poisoning
(including transaction ID and source port randomization), but it could
impair the ability of DNSSEC to protect against a denial-of-service
attack on a secure zone.
None, administrators need to upgrade to one of the versions detailed below.
None known at this time.
Upgrade BIND to one of the following: 9.4.3-P5,
9.5.2-P2 or 9.6.1-P3. There are no fixes available for BIND versions 9.0
through 9.3, as those releases are at End of Life. Note for BIND 9.7
beta-testers: pre-releases of 9.7.0 are vulnerable. Upcoming releases
will include these patches.
See our BIND Security Matrix for a complete listing of Security Vulnerabilities and versions affected.
If you'd like more information on our Forum or product support please visit www.isc.org/support.
Do you still have questions? Questions regarding this advisory should go to firstname.lastname@example.org
Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.
ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found here: https://www.isc.org/security-vulnerability-disclosure-policy
This Knowledge Base article https://kb.isc.org/article/AA-00932 is the complete and official security advisory document.
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