Knowledge Base ISC Main Website Ask a Question/Contact ISC
CVE-2007-2926: cryptographically weak query ids
Author: Cathy Almond Reference Number: AA-00921 Views: 5089 Created: 2013-05-23 16:16 Last Updated: 2013-05-23 16:16 0 Rating/ Voters

The DNS query id generation is vulnerable to cryptographic analysis

Posting date: 
24 Jul 2007
Program Impacted: 
BIND
Versions affected: 
9.0 (all versions), 9.1 (all versions), 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7, 9.2.8, 9.3.0, 9.3.1, 9.3.2, 9.3.3, 9.3.4, 9.4.0, 9.4.1
Severity: 
Medium
Exploitable: 
Remotely

Description:

The DNS query id generation is vulnerable to cryptographic analysis which provides a 1 in 8 chance of guessing the next query id for 50% of the query ids. This can be used to perform cache poisoning by an attacker.

This bug only affects outgoing queries, generated by BIND 9 to answer questions as a resolver, or when it is looking up data for internal uses, such as when sending NOTIFYs to slave name servers.

All users are encouraged to upgrade.

Workarounds:

None.

Active exploits:

None known at this time.

Solution: 

Upgrade to BIND 9.2.8-P1, BIND 9.3.4-P1, BIND 9.4.1-P1 or BIND 9.5.0a6.

Acknowledgements: Amit Klein from Trusteer (www.trusteer.com) found this vulnerability.

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.

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-00921 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.


© 2001-2015 Internet Systems Consortium

Please help us to improve the content of our knowledge base by letting us know below how we can improve this article.

If you have a technical question or problem on which you'd like help, please don't submit it here as article feedback.

For assistance with problems and questions for which you have not been able to find an answer in our Knowledge Base, 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.

ISC relies on the financial support of the community to fund the development of its open source software products. If you would like to support future product evolution and maintenance as well having peace of mind knowing that our team of experts are poised to provide you with individual technical assistance whenever you call upon them, then please consider our Professional Subscription Support services - details can be found on our main website.

Feedback
  • There is no feedback for this article
Info Submit Feedback on this Article
Nickname: Your Email: Subject: Comment:
Enter the code below:
Quick Jump Menu