CVE-2006-4096: BIND vulnerable to an INSIST failure via sending of multiple recursive queries
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CVE-2006-4096: BIND vulnerable to an INSIST failure via sending of multiple recursive queries

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Article summary

CVE: CVE-2006-4096

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.
See note for BIND 9.2.x




It is possible to trigger a INSIST failure by sending enough recursive queries that the response to the query arrives after all the clients looking for the response have left the recursion queue.

Exposure can be minimized by restricting sources that can
ask for recursion. Disable or restrict recursion (to limit exposure).

Active exploits:
None known at this time.

Upgrade to BIND 9.2.8, 9.3.4, or 9.4.0, or 9.5.0

Note for BIND 9.2.x:
Code handling this path for 9.2.x has been determined to be wrong, though ISC has not been able to detect an execution path that would trigger the erroneous code in 9.2.x. Nonetheless a patch is provided.

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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