CVE-2010-3613: cache incorrectly allows a ncache entry and a rrsig for the same type
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CVE-2010-3613: cache incorrectly allows a ncache entry and a rrsig for the same type

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Article summary

Failure to clear existing RRSIG records when a NO DATA is negatively cached could cause subsequent lookups to crash named.


CERT: VU#706148

Posting Date: 01 Dec 2010

Program ImpactedBIND

Versions Affected: 9.0.x to 9.7.2-P2, 9.4-ESV to 9.4-ESV-R3, 9.6-ESV to 9.6-ESV-R2

Severity: High

Exploitable: Remotely


Adding certain types of signed negative responses to cache doesn't clear any matching RRSIG records already in cache. A subsequent lookup of the cached data can cause named to crash (INSIST).

Impact and Risk Assessment

The INSIST crashes the server.

This vulnerability affects recursive nameservers irrespective of whether DNSSEC validation is enabled or disabled.

CVSS Score: 7.8

CVSS Equation:   (AV:N/AC:L/Au:N/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit:

Workarounds: None.

Active exploits: None known at this time.


The versions listed below are supported by ISC. All other versions are End of Life, and will not be patched. If you are running a version not listed below, you should upgrade as soon as possible.

  • 9.4.x: upgrade to 9.4-ESV-R4, or newer
  • 9.6.x: upgrade to 9.6.2-P3 or newer
  • 9.6-ESV: upgrade to 9.6-ESV-R3 or newer
  • 9.7.x: upgrade to 9.7.2-P3

Acknowledgements: Shinichi Furuso

Document Revision History

24 Nov 2010: Corrected/Updated: Versions affected, CVSS Score, Impact and Risk Assessment and Solution 14 Dec 2010: Updated Versions Affected, Solution and Acknowledgement

Related Documents

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

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