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


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

Posting date: 
01 Dec 2010
Program Impacted: 
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


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)

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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 Matrix for a complete listing of Security Vulnerabilities and versions affected.

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