Knowledge Base ISC Main Website Ask a Question/Contact ISC
CVE-2012-4244: A specially crafted Resource Record could cause named to terminate
Author: Cathy Almond Reference Number: AA-00778 Views: 28130 Created: 2012-08-23 12:32 Last Updated: 2012-09-12 16:46 0 Rating/ Voters
A nameserver can be caused to exit with a REQUIRE exception if it can be induced to load a specially crafted resource record.

Document Version:        
 2.0
Posting date: 
12 September 2012
Program Impacted: 
BIND
Versions affected: 
9.0.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P2, 9.7.0->9.7.6-P2, 9.8.0->9.8.3-P2, 9.9.0->9.9.1-P2
Severity: 
Critical
Exploitable: 

Remotely

Description:

If a record with RDATA in excess of 65535 bytes is loaded into a nameserver, a subsequent query for that record will cause named to exit with an assertion failure.

Please Note: Versions of BIND 9.4 and 9.5 are also affected, but these branches are beyond their "end of life" (EOL) and no longer receive testing or security fixes from ISC. For current information on which versions are actively supported, please see http://www.isc.org/software/bind/versions.

Impact:

This vulnerability can be exploited remotely against recursive servers by inducing them to query for records provided by an authoritative server. It affects authoritative servers if a zone containing this type of resource record is loaded from file or provided via zone transfer.

CVSS Score:  7.8

CVSS Equation:  (AV:N/AC:L/Au:N/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Workarounds:

Workarounds are under investigation, but none are known at this time.

Active exploits:

No known active exploits.

Solution:  Upgrade to the patched version or new release most closely related to your current version of BIND. The patched versions of BIND can be downloaded from http://www.isc.org/downloads/all.  The new release versions will be available within the next week.

  • BIND 9 version 9.7.7, 9.7.6-P3
  • BIND 9 version 9.6-ESV-R8, 9.6-ESV-R7-P3
  • BIND 9 version 9.8.4, 9.8.3-P3
  • BIND 9 version 9.9.2, 9.9.1-P3

Document Revision History:

1.0 - 4 Sept., 2012  Advance Notification to Phase 1
1.1 - 6 Sept. 2012 Corrected error in Description (65535 bytes)
1.2 - 11 Sept. 2012 Phase 2 & 3 notified
2.0 - 12 Sept. 2012 Phase 4 - Public Released

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/software/guild or 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-00778 is the complete and official security advisory document.  There is also a summary article located on our website and linking to here: https://www.isc.org/software/bind/advisories/cve-2012-4244

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