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CVE-2010-3614: Key algorithm rollover bug in bind9
Author: Cathy Almond Reference Number: AA-00936 Views: 2214 Created: 2013-05-23 23:03 Last Updated: 2013-05-23 23:03 0 Rating/ Voters
named (acting as DNSSEC validating resolver) could incorrectly mark zone data as insecure when the zone being queried is undergoing a key algorithm rollover.

Posting date: 
01 Dec 2010
Program Impacted: 
BIND
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

Description:

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 http://tools.ietf.org/html/draft-ietf-dnsop-rfc4641bis-02#section-4.2.4 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: http://nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:L/Au:N/C:N/I:P/A:N)

Workarounds:

None.

Active exploits:

None known at this time.

Solution: 

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 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 security-officer@isc.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-00936 is the complete and official security advisory document.

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