CVE-2010-3614: Key algorithm rollover bug in BIND 9
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CVE-2010-3614: Key algorithm rollover bug in BIND 9

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Article summary

named (acting as DNSSEC validating resolver) could incorrectly mark zone data as insecure when the zone being queried is undergoing a key algorithm rollover.


CERT: VU#837744

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: Low

Exploitable: Remotely


named, acting as a DNSSEC validator, was determining if an NS RRset is insecure based on a value that could mean either that the RRset is actually insecure or that there wasn't a matching key for the RRSIG in the DNSKEY RRset when resuming from validating the DNSKEY RRset.

This can happen when in the middle of a DNSKEY algorithm rollover, when two different algorithms were used to sign a zone but only the new set of keys are in the zone DNSKEY RRset.
See for example scenario.

Impact and Risk Assessment: Answers are marked incorrectly as insecure.

CVSS Score: 5.0

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

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.


If you are running anything not listed below, upgrade as other versions are EOL and not being patched. 9.4: upgrade to 9.4-ESV-R4, or newer 9.6: upgrade to 9.6.2-P3 or 9.6-ESV-R3, or newer 9.7: upgrade to 9.7.2-P3

Document Revision History

Nov24-Corrected/updated: Versions Affected, CVSS Base Score and Solution

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

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