CVE-2016-2776: Assertion Failure in buffer.c While Building Responses to a Specifically Constructed Request
mcnally at isc.org
Tue Sep 27 17:03:06 UTC 2016
Document Version: 2.0
Posting date: 2016-09-27
Program Impacted: BIND
Versions affected: 9.0.x -> 9.8.x, 9.9.0->9.9.9-P2, 9.9.3-S1->9.9.9-S3,
Testing by ISC has uncovered a critical error condition which
can occur when a nameserver is constructing a response. A defect
in the rendering of messages into packets can cause named to
exit with an assertion failure in buffer.c while constructing a
response to a query that meets certain criteria.
This assertion can be triggered even if the apparent source
address isn't allowed to make queries (i.e. doesn't match
All servers are vulnerable if they can receive request packets from
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:
No practical workarounds exist.
No known active exploits.
Upgrade to the patched release most closely related to your
current version of BIND. These can all be downloaded from
BIND 9 version 9.9.9-P3
BIND 9 version 9.10.4-P3
BIND 9 version 9.11.0rc3
BIND 9 Supported Preview edition is a feature preview version of
BIND provided exclusively to eligible ISC Support customers.
BIND 9 version 9.9.9-S5
Document Revision History:
1.0 Advance Notification 2016-09-14
1.1 Added information about the Stable Preview release to versions
Updated solution section to reflect replacing 9.11.0rc2 with
and 9.9.9-S4 with 9.9.9-S5.
2.0 Posting date changed and public disclosure, 2016-09-28
See our BIND9 Security Vulnerability Matrix at
https://kb.isc.org/article/AA-00913 for a complete listing of
Security Vulnerabilities and versions affected.
If you'd like more information on ISC Subscription Support and
Advance Security Notifications, please visit http://www.isc.org/support/.
Do you still have questions? Questions regarding this advisory
should go to security-officer at isc.org. To report a new issue,
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issues at: https://www.isc.org/community/report-bug/.
ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which
versions are actively supported, please see
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can
be found here: https://kb.isc.org/article/AA-00861
This Knowledge Base article https://kb.isc.org/article/AA-01419 is
the complete and official security advisory document.
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