CVE-2007-0494: Denial of service via ANY query response containing multiple RRsets.
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CVE-2007-0494: Denial of service via ANY query response containing multiple RRsets.

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Article Summary

Verification logic for multiple DNSSEC RRsets can trigger server failure.



Posting date: 

30 Jan 2007

Program Impacted: 


Versions affected: 

9.0, 9.1, 9.2, 9.3.0-9.3.3, pre-release versions of 9.4.0, Alpha release of 9.5.0






When validating responses to type * (ANY) queries that return multiple RRsets in the answer section it is possible to trigger assertions checks. To be vulnerable you need to have enabled DNSSEC validation in named.conf by specifying trusted-keys.


Disable or restrict recursion (to limit exposure). Disable DNSSEC validation (remove all trusted-keys from named.conf).

Active exploits:

None known at this time.


Upgrade to BIND 9.2.8, BIND 9.3.4 or a released version of BIND 9.4 or 9.5


It is recommended that anyone using DNSSEC upgrade to BIND 9.3, as the DNSSEC implementation in BIND 9.2 has been obsoleted.

Related Documents:

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

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

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:

This Knowledge Base article is the complete and official security advisory document.

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