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AUSCERT External Security Bulletin Redistribution
ESB-2012.0871
A vunerability has been identified in BIND9
13 September 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-2012-4244
Original Bulletin:
https://kb.isc.org/article/AA-00778
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CVE-2012-4244: A specially crafted Resource Record could cause named
to terminate
A nameserver can be caused to exit with a REQUIRE exception if it
can be induced to load a specially crafted resource record.
CVE: CVE-2012-4244
Document Version: 2.0
Posting date: 12 September 2012
Program Impacted: BIND
Versions affected:
9.0.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P2,
9.7.0->9.7.6-P2, 9.8.0->9.8.3-P2, 9.9.0->9.9.1-P2
Severity: Critical
Exploitable: Remotely
Description:
If a record with RDATA in excess of 65535 bytes is loaded into
a nameserver, a subsequent query for that record will cause named
to exit with an assertion failure.
Please Note: Versions of BIND 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:
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 a zone
containing this type of resource record is loaded from file or
provided via zone transfer.
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: None are known at this time.
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 (-P3) of BIND can be downloaded from
http://www.isc.org/downloads/all. The new release versions will
be available within the next week.
BIND 9 version 9.7.7, 9.7.6-P3
BIND 9 version 9.6-ESV-R8, 9.6-ESV-R7-P3
BIND 9 version 9.8.4, 9.8.3-P3
BIND 9 version 9.9.2, 9.9.1-P3
Document Revision History:
1.0 - 4 Sept., 2012 Advance Notification to Phase 1
1.1 - 6 Sept. 2012 Corrected error in Description (65535 bytes)
1.2 - 11 Sept. 2012 Phase 2 & 3 notified
2.0 - 12 Sept. 2012 Phase 4 - Public Released
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-00778 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-2012-4244
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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