A specially crafted query sent to a BIND nameserver can cause it to crash with a REQUIRE assertion error.
Posting date: 11 June 2014
A query specially crafted to exploit a defect in EDNS option processing can cause named to
terminate with an assertion failure.
Both authoritative and recursive servers are vulnerable to this defect. Exploitation of this
condition can cause a denial of service in nameservers running affected versions of BIND 9.10. Access Control Lists do not provide protection.
The bug which causes this condition is in libdns; consequently in
addition to the named server process other applications (for example: dig and delv) built using the libdns library from
the affected source distributions can also be forced to crash with assertion failures
triggered in the same fashion.
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)
No known workarounds at this time.
There are no known active exploits.
Upgrade to the patched release most closely related to your current version of BIND. Open source versions can all be downloaded from http://www.isc.org/downloads.
ISC would like to thank Codenomicon for detecting this issue.
Document Revision History:
1.0 Phase One, Advance Notification, 04 June 2014
2.0 Phase Four, Public Disclosure, 11 June 2014
See our BIND Security Matrix for a complete listing of Security Vulnerabilities and versions affected.
If you'd like more information on our product support or about our Subscription versions of BIND, please visit http://www.dns-co.com/solutions/.
Do you still have questions? Questions regarding this advisory should go to email@example.com. To report a new issue, please encrypt your message using firstname.lastname@example.org'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 although when possible we indicate EOL versions affected. The latest versions of ISC software can always be found on our web site at http://www.isc.org/downloads/. There you will find additional information about each release.
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-01166 is the complete and official security advisory document.
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