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Date: Tue, 19 Jan 2016 15:06:51 -0600 (CST)
From: "Jeremy C. Reed" <jreed@....org>
To: oss-security@...ts.openwall.com
Subject: CVE-2015-8704: Specific APL data could trigger an INSIST in apl_42.c
causing BIND named to exit
CVE: CVE-2015-8704
Document Version: 2.0
Posting date: 19 January 2016
Program Impacted: BIND
Versions affected: 9.3.0->9.8.8, 9.9.0->9.9.8-P2,
9.9.3-S1->9.9.8-S3, 9.10.0->9.10.3-P2
Severity: High
Exploitable: Remotely
Description:
A buffer size check used to guard against overflow could cause
named to exit with an INSIST failure In apl_42.c.
Impact:
A server could exit due to an INSIST failure in apl_42.c when
performing certain string formatting operations. Examples include
(but may not be limited to):
- Slaves using text-format db files could be vulnerable if
receiving a malformed record in a zone transfer from their master.
- Masters using text-format db files could be vulnerable if
they accept a malformed record in a DDNS update message.
- Recursive resolvers are potentially vulnerable when debug
logging, if they are fed a deliberately malformed record by
a malicious server.
- A server which has cached a specially constructed record
could encounter this condition while performing 'rndc dumpdb'.
Please Note:
Versions of BIND from 9.3 through 9.8 are also affected, but
these branches are beyond their "end of life" (EOL) and no longer
receive testing or security fixes from ISC. For current information
on which versions are actively supported, please see
http://www.isc.org/downloads/.
CVSS Score: 6.8
CVSS Vector: (AV:N/AC:L/Au:S/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:S/C:N/I:N/A:C)
Workarounds:
None
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 9.9.8-P3
- BIND 9 version 9.10.3-P3
BIND 9 Supported Preview edition is a feature preview version
of BIND provided exclusively to eligible ISC Support customers.
- BIND 9 version 9.9.8-S4
Document Revision History:
1.0 Advance Notification 12 January 2016
2.0 Public Disclosure 19 January 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@....org. To report a new issue,
please encrypt your message using security-officer@....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-01335
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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