(acting as DNSSEC
validating resolver) could incorrectly mark zone data
as insecure when the zone being queried is undergoing a key algorithm
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 9.6-ESV-R2
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)
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
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-00936 is the complete and official security advisory document.
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