CVE-2012-1667: Handling of zero length rdata can cause named to terminate unexpectedly
| Author: Cathy Almond Reference Number: AA-00698 Views: 10177 Created: 2012-06-04 08:37 Last Updated: 2012-07-24 00:13
0 Rating/ Voters
of DNS resource records where the rdata field is zero length may cause
various issues for the servers handling them.
Posting date: 04 Jun 2012
9.0.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1,
9.6-ESV->9.6-ESV-R7, 9.7.0->9.7.6, 9.8.0->9.8.3,
This problem was uncovered while testing with
experimental DNS record types. It is possible to add records to BIND
with null (zero length) rdata fields.
Processing of these records may lead to unexpected outcomes.
Recursive servers may crash or disclose some portion of memory to the
client. Secondary servers may crash on restart after transferring a
zone containing these records. Master servers may corrupt zone data if
the zone option "auto-dnssec" is set to "maintain". Other unexpected
problems that are not listed here may also be encountered.
This issue primarily affects recursive
nameservers. Authoritative nameservers will only be impacted if an
administrator configures experimental record types with no data. If the
server is configured this way, then secondaries can crash on restart
after transferring that zone. Zone data on the master can become
corrupted if the zone with those records has named configured to manage
the DNSSEC key rotation.
CVSS Score: 8.5
CVSS Equation: (AV:N/AC:L/Au:N/C:P/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:P/I:N/A:C)
Workarounds are under investigation, but none are known at this time.
No known active exploits but a public discussion of
the issue has taken place on a public mailing list.Solution:
Upgrade to BIND version 9.6-ESV-R7-P1, 9.7.6-P1, 9.8.3-P1, or 9.9.1-P1
Acknowledgment: Dan Luther,
Level3 Communications, for finding the issue, Jeffrey A. Spain,
Cincinnati Day School, for replication and testing.
Document Revision History:
1.0 Released to Public 4 June, 2012
1.1 Updated Severity to Critical
1.2 Added German Translation 7 June, 2012
1.3 Added link to FAQ supplemental article in KB
1.4 Added Chinese Translation
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 ConsortiumPlease 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.