There's an attack in the wild on BIND >9.7; if you have DNS problems, this may be pertinent. [Forwarded from NANOG] Cheers, -- jra ----- Forwarded Message -----

From: "staticsafe" <me@staticsafe.ca> To: nanog@nanog.org Sent: Saturday, July 27, 2013 6:27:59 AM Subject: [security-officer@isc.org: Notice: BIND Security Jul2013 CVE2013-4854] ----- Forwarded message from ISC Security Officer <security-officer@isc.org> -----

Date: Fri, 26 Jul 2013 13:46:50 -0700 From: ISC Security Officer <security-officer@isc.org> To: bind-announce@lists.isc.org, bind-workers@lists.isc.org, bind-users@lists.isc.org Subject: Notice: BIND Security Jul2013 CVE2013-4854

IMPORTANT: The security issue described below has been confirmed by ISC to be 'in the wild' as of 18:00UTC July 26, and exploitation of this vulnerability against production servers has been reported by multiple organizations. Please be advised that immediate action is recommended.

A specially crafted query can cause BIND to terminate CVE: CVE-2013-4854 Document Version: 2.0 Posting date: 26 July 2013 Program Impacted: BIND Versions affected: Open source: 9.7.0->9.7.7, 9.8.0->9.8.5-P1, 9.9.0->9.9.3-P1, 9.8.6b1 and 9.9.4b1; Subscription: 9.9.3-S1 and 9.9.4-S1b1 Severity: Critical Exploitable: Remotely Description:

A specially crafted query that includes malformed rdata can cause named to terminate with an assertion failure while rejecting the malformed query.

BIND 9.6 and BIND 9.6-ESV are unaffected by this problem. Earlier branches of BIND 9 are believed to be unaffected but have not been tested. BIND 10 is also unaffected by this issue.

Please Note: All versions of BIND 9.7 are known to be 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/software-support-policy/bind-software-status/.

Impact:

Authoritative and recursive servers are equally vulnerable. Intentional exploitation of this condition can cause a denial of service in all nameservers running affected versions of BIND 9. Access Control Lists do not provide any protection from malicious clients.

In addition to the named server, applications built using libraries from the affected source distributions may crash with assertion failures triggered in the same fashion.

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...)

Workarounds:

No known workarounds at this time.

Active exploits:

Crashes have been reported by multiple ISC customers. First observed in the wild on 26 July 2013, 18:00 UTC.

Solution:

Upgrade to the patched release most closely related to your current version of BIND. Open source versions can all be downloaded from http://www.isc.org/downloads. Subscription version customers will be contacted directly by ISC Support regarding delivery.

BIND 9 version 9.8.5-P2 BIND 9 version 9.9.3-P2 BIND 9 version 9.9.3-S1-P1 (Subscription version available via DNSco)

Acknowledgements:

ISC would like to thank Maxim Shudrak and the HP Zero Day Initiative for reporting this issue.

Document Revision History:

1.0 Phase One Advance Notification, 18 July 2013 1.1 Phases Two and Three Advance Notification, 26 July 2013 2.0 Notification to public (Phase Four), 26 July 2013

Related Documents:

Spanish Translation: planned Japanese Translation: https://kb.isc.org/article/AA-01023 Portuguese Translation: https://kb.isc.org/article/AA-01021

See our BIND Security Matrix for a complete listing of Security Vulnerabilities and versions affected.

This Knowledge Base article https://kb.isc.org/article/AA-01016 provides additional information and Frequently Asked Questions about this advisory.

If you'd like more information on our product support or about our Subscription versions of BIND, please visit http://www.dns-co.com/solutions

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/mission/contact/.

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: ISC Software Defect and Security Vulnerability Disclosure Policy

This Knowledge Base article https://kb.isc.org/article/AA-01015 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) 2001-2013 Internet Systems Consortium

_______________________________________________ bind-announce mailing list bind-announce@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-announce

----- End forwarded message -----

-- staticsafe O< ascii ribbon campaign - stop html mail - www.asciiribbon.org Please don't top post. Please don't CC! I'm subscribed to whatever list I just posted on.

-- Jay R. Ashworth Baylink jra@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII St Petersburg FL USA #natog +1 727 647 1274