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AUSCERT External Security Bulletin Redistribution
ESB-2016.2264
CVE-2016-2776: Assertion Failure in buffer.c While Building
Responses to a Specifically Constructed Request
28 September 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIND
Publisher: Internet Systems Consortium
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-2776
Original Bulletin:
https://kb.isc.org/article/AA-01419/0
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CVE-2016-2776: Assertion Failure in buffer.c While Building Responses to a
Specifically Constructed Request
Author: Brian Conry
Reference Number: AA-01419
Created: 2016-09-27 08:30
Last Updated: 2016-09-27 16:08
CVE:
CVE-2016-2776
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, 9.10.0->9.10.4-P2,
9.11.0a1->9.11.0rc1
Severity:
High
Exploitable:
Remotely
Description:
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 'allow-query').
Impact:
All servers are vulnerable if they can receive request packets from any
source.
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&adv&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Workarounds:
No practical workarounds exist.
Active exploits:
No known active exploits.
Solution: Upgrade to the patched release most closely related to your current
version of BIND. These can all be downloaded from
http://www.isc.org/downloads.
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 affected.
Updated solution section to reflect replacing 9.11.0rc2 with 9.11.0rc3 and
9.9.9-S4 with 9.9.9-S5.
2.0 Posting date changed and public disclosure.
Related Documents:
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@isc.org. To report a new issue, please encrypt your message
using security-officer@isc.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/community/report-bug/.
Note: ISC patches only currently supported versions. When possible we indicate
EOL versions affected. (For current information on which versions are actively
supported, please see http://www.isc.org/downloads/).
ISC Security Vulnerability Disclosure Policy: Details of our current security
advisory policy and practice can be found here:
https://kb.isc.org/article/AA-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html
This Knowledge Base article https://kb.isc.org/article/AA-01419 is the
complete and official security advisory document.
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.
2001-2016 Internet Systems Consortium
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