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
9.0.x to 9.7.2-P2, 9.4-ESV to 9.4-ESV-R3, 9.6-ESV to
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: http://nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)
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
- 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
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-00938 is the complete and official security advisory document.
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