A defect in the prefetch feature can cause named to crash when handling some queries.
A defect in the pre-fetch feature (which is enabled by default) can cause BIND 9.10.0 to terminate with a "REQUIRE" assertion failure if it processes queries whose answers have particular attributes. This can be triggered as the result of normal query processing.
Recursive nameservers are vulnerable to
this defect. Authoritative-only servers are not at risk. On an affected nameserver, the assertion failure, if triggered, results in an immediate exit from named, denying service to clients attempting to query the recursive server.
CVSS Score: 7.8
CVSS Vector: (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&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)
The problematic code is bypassed and prefetching is disabled by setting the prefetch option to zero within the options block in named.conf:
There are no known active exploits but the crash has been independently reported by multiple organizations.
Solution: Upgrade to the patched release listed below. BIND software can be downloaded from http://www.isc.org/downloads
Document Revision History:
1.0 Phase One, Advance Notification: 7 May 2014
2.0 Phase Four, Public Disclosure: 8 May 2014
See our BIND Security Matrix for a complete listing of Security Vulnerabilities and versions affected.
If you'd like more information on ISC product support please visit http://www.dns-co.com/solutions/.
Do you still have questions? Questions regarding this advisory should go to firstname.lastname@example.org. To report a new issue, please encrypt your message using email@example.com's PGP key which can be found here: https://www.isc.org/downloads/software-support-policy/openpgp-key/. If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/mission/contact/.
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: ISC Software Defect and Security Vulnerability Disclosure Policy
This Knowledge Base article https://kb.isc.org/article/AA-01161 is the complete and official security advisory document.
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.
© 2001-2017 Internet Systems ConsortiumFor 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.