CVE-2006-4095: Assertion failure when querying for SIG records
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CVE-2006-4095: Assertion failure when querying for SIG records

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Article Summary

CVE: CVE-2006-4095

Posting date: 5 Sep 2006

Program Impacted: BIND

Versions affected:
BIND 9.3.x versions 9.3.0, 9.3.1, 9.3.2, 9.3.3b, and 9.3.3rc1, and BIND 9.4.x versions 9.4.0a1, 9.4.0a2, 9.4.0a3, 9.4.0a4, 9.4.0a5, 9.4.0a6, and 9.4.0b1.




Recursive servers:

Queries for SIG records will trigger a assertion failure if more than one SIG(covered) RRset is returned.

Exposure can be minimized by restricting sources that can ask for recursion.

Authoritative servers:

If a nameserver is serving a RFC 2535 DNSSEC zone and is queried for the SIG records where the are multiple SIG(covered) RRsets (e.g. a zone apex) then named will trigger a assertion failure when it trys to construct the response.


Active exploits:
None known at this time.

Upgrade to BIND 9.3.4, or 9.4.0, or 9.5.0

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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