CVE-2010-0097: BIND 9 DNSSEC validation code could cause bogus NXDOMAIN responses
  • 01 Oct 2018
  • 1 Minute to read
  • Contributors
  • Dark
  • PDF

CVE-2010-0097: BIND 9 DNSSEC validation code could cause bogus NXDOMAIN responses

  • Dark
  • PDF

Article Summary


CERT: VU#360341

Posting Date: 19 Jan 2010

Program ImpactedBIND

Versions Affected: 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

Severity: Low

Exploitable: Remotely


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.


This 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.

Workarounds: None. Administrators need to upgrade to one of the versions detailed below.

Active Exploits: 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.

Related Documents

See our BIND 9 Security Vulnerability Matrix for a complete listing of Security Vulnerabilities and versions affected.

Do you still have questions? Questions regarding this advisory should go to

ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in our Software Defect and Security Vulnerability Disclosure Policy.

Legal Disclaimer

Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time.

A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors.