Knowledge Base ISC Main Website Ask a Question/Contact ISC
CVE-2006-4095: Multiple DoS vulnerabilities
Author: Cathy Almond Reference Number: AA-00916 Views: 2074 Created: 2013-05-23 15:05 Last Updated: 2013-05-23 15:15 0 Rating/ Voters

Certain query sequences can cause server failure

CVE: 
CVE-2006-4095  
Posting date: 
06 Sep 2006
Program Impacted: 
BIND
Versions affected: 
9.2, 9.3.0-9.2, pre-release versions of 9.4.0
Severity: 
High
Exploitable: 
Remotely

Description:

SIG Query Processing:

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.

Excessive Recursive Queries INSIST failure:

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 canask for recursion. 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.

Workarounds:

None.

Active exploits:

None known at this time

Solution:  

Upgrade to BIND 9.4.0b2, BIND 9.3.3rc2, BIND 9.3.2-P1, BIND 9.2.7rc1 or BIND 9.2.6-P1 (or later).

See also CVE-2006-4096

Acknowledgements: ISC would like to thank The Measurement Factory for bringing this to our attention.

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-00916 is the complete and official security advisory document.

Legal Disclaimer:
Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time.  A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors.


© 2001-2014 Internet Systems Consortium

Feedback
  • Please help us to improve the content of our knowledge base by letting us know how we can improve this article or by submitting suggestions for other articles you'd like to see created. Information on how to obtain further help on our products or services can be found on our main website.' If you have a technical question or problem on which you'd like help, we recommend searching our community mailing list archives and/or posting your question there (you will need to register there first for your posts to be accepted). The bind-users and the dhcp-users lists particularly have a long-standing and active membership.
Info Submit Feedback on this Article
Nickname: Your Email: Subject: Comment:
Enter the code below:
Quick Jump Menu