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AUSCERT External Security Bulletin Redistribution
ESB-2012.0974
CVE-2012-5166: Specially crafted DNS data can cause a lockup in named
10 October 2012
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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-2012-5166
Original Bulletin:
https://kb.isc.org/article/AA-00801
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CVE-2012-5166: Specially crafted DNS data can cause a lockup in named
A nameserver can be locked up if it can be induced to load a specially
crafted combination of resource records.
CVE: CVE-2012-5166
Document Version: 2.0
Posting date: 9 October 2012
Program Impacted: BIND
Versions affected:
9.2.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P3,
9.7.0->9.7.6-P3, 9.8.0->9.8.3-P3, 9.9.0->9.9.1-P3
Severity: Critical
Exploitable:
Remotely
Description:
If specific combinations of RDATA are loaded into a nameserver,
either via cache or an authoritative zone, a subsequent query
for a related record will cause named to lock up.
Please Note: All versions of BIND 9.2, 9.3, 9.4 and 9.5 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/software/bind/versions.
Impact:
A nameserver that has become locked-up due to the problem reported
in this advisory will not respond to queries or control commands.
Normal functionality cannot be restored except by terminating
and restarting named.
This vulnerability can be exploited remotely against recursive
servers by inducing them to query for records provided by an
authoritative server. It affects authoritative servers if one
of the combinations of resource records is loaded from file,
provided via zone transfer, or submitted to a zone via dynamic
update.
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)
Workarounds:
Setting the option 'minimal-responses' to 'yes' will prevent the lockup.
Active exploits:
No known active exploits.
Solution:
Upgrade to the patched version or new release most closely related
to your current version of BIND. The patched versions of BIND
and new releases can be downloaded from
http://www.isc.org/downloads/all.
BIND 9 version 9.7.7, 9.7.6-P4
BIND 9 version 9.6-ESV-R8, 9.6-ESV-R7-P4
BIND 9 version 9.8.4, 9.8.3-P4
BIND 9 version 9.9.2, 9.9.1-P4
Acknowledgement:
ISC would like to thank Jake Montgomery of Dyn, Inc.
Document Revision History:
1.0 - 1 Oct., 2012 Advance Notification to Phase 1
1.1 - 8 Oct., 2012 Notification to Phase 3
2.0 - 9 Oct., 2012 Notification to Phase 4 (Public)
Related Documents:
See our BIND Security Matrix for a complete listing of Security
Vulnerabilities and versions affected. If you'd like more
information on our Forum or product support please visit
www.isc.org/software/guild or www.isc.org/support.
Do you still have questions? Questions regarding this advisory
should go to security-officer@isc.org
Note: ISC patches only currently supported versions. When possible
we indicate EOL versions affected.
ISC Security Vulnerability Disclosure Policy: Details of our
current security advisory policy and practice can be found here:
https://www.isc.org/security-vulnerability-disclosure-policy
The Knowledge Base article https://kb.isc.org/article/AA-00801
is the complete and official security advisory document. There
is also a summary article located on our website and linking to
here: https://www.isc.org/software/bind/advisories/cve-2012-5166
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) 2001-2012 Internet Systems Consortium
_______________________________________________
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