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AUSCERT External Security Bulletin Redistribution
ESB-2016.1773
A vulnerability has been identified in BIND
19 July 2016
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AusCERT Security Bulletin Summary
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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-2016-2775
Original Bulletin:
https://kb.isc.org/article/AA-01393
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Although not commonly used, the BIND package contains provisions
to allow systems to resolve names using the lightweight resolver
protocol, a protocol similar to (but distinct from) the normal DNS
protocols. The lightweight resolver protocol can be used either
by running the lwresd utility installed with BIND or by configuring
named using the "lwres" statement in named.conf.
An error has been discovered in the BIND implementation of the
lightweight resolver protocol affecting systems which use this
alternate method to do name resolution.
CVE: CVE-2016-2775
Document Version: 2.0
Posting date: 18 July 2016
Program Impacted: BIND (lwres only)
Versions affected: 9.0.x -> 9.9.9-P1, 9.10.0->9.10.4-P1, 9.11.0a3->9.11.0b1
Severity: Medium
Exploitable: Remotely (if lwres is configured to accept remote
client connections)
Description:
If the lightweight resolver is asked to resolve a query name
which, when combined with a search list entry, exceeds the maximum
allowable length, the server can terminate due to an error.
Impact:
A server which is affected by this defect will terminate with a
segmentation fault error, resulting in a denial of service to
client programs attempting to resolve names.
CVSS Score: 5.4 if the server is configured to accept requests from the network.
CVSS Vector: (AV:N/AC:H/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:H/Au:N/C:N/I:N/A:C)
Workarounds:
None.
Active exploits:
No known active exploits, but the bug has been publicly disclosed
in an open bug repository operated by Red Hat.
Solution:
Upgrade to the patched release most closely related to your
current version of BIND. These can be downloaded from
http://www.isc.org/downloads.
- BIND 9 version 9.9.9-P2
- BIND 9 version 9.10.4-P2
The BIND 9.11 branch is currently in beta development.
- BIND 9 version 9.11.0b2
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-S3
Document Revision History:
1.0 Advance Notification, 14 July 2016
2.0 Public Disclosure, 18 July 2016
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
This Knowledge Base article https://kb.isc.org/article/AA-01393 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.
(c) 2001-2016 Internet Systems Consortium
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