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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2300
           Multiple vulnerabilities have been identified in BIND
                             3 September 2015

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BIND
Publisher:         ISC
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-5986 CVE-2015-5722 

Original Bulletin: 
   https://kb.isc.org/article/AA-01291/74/CVE-2015-5986%3A-An-incorrect-boundary-check-can-trigger-a-REQUIRE-assertion-failure-in-openpgpkey_61.c.html
   https://kb.isc.org/article/AA-01287/74/CVE-2015-5722%3A-Parsing-malformed-keys-may-cause-BIND-to-exit-due-to-a-failed-assertion-in-buffer.c.html

Comment: This bulletin contains two (2) ISC security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

CVE-2015-5986: An incorrect boundary check can trigger a REQUIRE assertion 
failure in openpgpkey_61.c

Author: Michael McNally

Reference Number: AA-01291

Created: 2015-08-19 08:22

Last Updated: 2015-09-02 20:00

CVE: CVE-2015-5986

Document Version: 2.0

Posting date: 02 September 2015

Program Impacted: BIND

Versions affected: 9.9.7 -> 9.9.7-P2, 9.10.2 -> 9.10.2-P3.

Severity: Critical

Exploitable: Remotely

Description:

An incorrect boundary check in openpgpkey_61.c can cause named to terminate 
due to a REQUIRE assertion failure. This defect can be deliberately exploited
by an attacker who can provide a maliciously constructed response in answer to
a query.

Impact:

A server which encounters this error will terminate due to a REQUIRE assertion
failure, resulting in denial of service to clients.

Recursive servers are at greatest risk from this defect but some circumstances
may exist in which the attack can be successfully exploited against an 
authoritative server. Servers should be upgraded to a fixed version.

CVSS Score: 7.1

CVSS Vector: (AV:N/AC:M/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:M/Au:N/C:N/I:N/A:C)

Workarounds:

No workarounds are known to exist.

Active exploits:

None known.

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 9.9.7-P3

    BIND 9 version 9.10.2-P4

BIND development releases scheduled to be published at the same time as the 
public disclosure of this vulnerability will also contain the fix for this 
security issue.

    BIND 9 version 9.9.8rc1

    BIND 9 version 9.10.3rc1

Document Revision History:

1.0 Advance Notification 19 August, 2015

2.0 Public Disclosure 2 September, 2015

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-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html

This Knowledge Base article https://kb.isc.org/article/AA-01291 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) 2001-2015 Internet Systems Consortium

Please help us to improve the content of our knowledge base by letting us know
below how we can improve this article.

If you have a technical question or problem on which you'd like help, please 
don't submit it here as article feedback.

For assistance with problems and questions for which you have not been able to
find an answer in our Knowledge Base, we recommend searching our community 
mailing list archives and/or posting your question there (you will need to 
register there first for your posts to be accepted). The bind-users and the 
dhcp-users lists particularly have a long-standing and active membership.

ISC relies on the financial support of the community to fund the development 
of its open source software products. If you would like to support future 
product evolution and maintenance as well having peace of mind knowing that 
our team of experts are poised to provide you with individual technical 
assistance whenever you call upon them, then please consider our Professional
Subscription Support services - details can be found on our main website.

- ------------------------------------------------------------------------------

CVE-2015-5722: Parsing malformed keys may cause BIND to exit due to a failed 
assertion in buffer.c

Author: Michael McNally

Reference Number: AA-01287

Created: 2015-08-03 21:26

Last Updated: 2015-09-02 20:00

CVE: CVE-2015-5722

Document Version: 2.0

Posting date: 2 September 2015

Program Impacted: BIND

Versions affected: BIND 9.0.0 -> 9.8.8, BIND 9.9.0 -> 9.9.7-P2, BIND 9.10.0 ->
9.10.2-P3

Severity: Critical

Exploitable: Remotely

Description:

Parsing a malformed DNSSEC key can cause a validating resolver to exit due to
a failed assertion in buffer.c. It is possible for a remote attacker to 
deliberately trigger this condition, for example by using a query which 
requires a response from a zone containing a deliberately malformed key.

Impact:

Recursive servers are at greatest risk but an authoritative server could be 
affected if an attacker controls a zone the server must query against to 
perform its zone service.

Servers which are affected may terminate with an assertion failure, causing 
denial of service to all clients.

CVSS Score: 7.8

CVSS Vector: (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: 
https://nvd.nist.gov/cvss.cfm?calculator&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Workarounds:

Servers which are not performing validation are not at risk from this defect 
(but are at increased risk from other types of DNS attack.) ISC does not 
recommend disabling validation to deal with this issue; upgrading to a fixed 
version is the preferred solution.

Active exploits:

None known

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 9.9.7-P3

    BIND 9 version 9.10.2-P4

BIND development releases scheduled to be published at the same time as the 
public disclosure of this vulnerability will also contain the fix for this 
security issue.

    BIND 9 version 9.9.8rc1

    BIND 9 version 9.10.3rc1

Acknowledgements:

ISC would like to thank Hanno Bck from the Fuzzing Project for discovering and
reporting this defect. We would also like to express our appreciation to the 
developers of the American Fuzzy Lop tool, which has been instrumental in 
revealing recently-disclosed vulnerabilities in BIND.

Document Revision History:

1.0 Advance Notification 19 August 2015

1.1 "Versions affected" information clarified 24 August, 2015

2.0 Public Disclosure 2 September, 2015

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-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html

This Knowledge Base article https://kb.isc.org/article/AA-01287 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) 2001-2015 Internet Systems Consortium

Please help us to improve the content of our knowledge base by letting us know
below how we can improve this article.

If you have a technical question or problem on which you'd like help, please 
don't submit it here as article feedback.

For assistance with problems and questions for which you have not been able to
find an answer in our Knowledge Base, we recommend searching our community 
mailing list archives and/or posting your question there (you will need to 
register there first for your posts to be accepted). The bind-users and the 
dhcp-users lists particularly have a long-standing and active membership.

ISC relies on the financial support of the community to fund the development 
of its open source software products. If you would like to support future 
product evolution and maintenance as well having peace of mind knowing that 
our team of experts are poised to provide you with individual technical 
assistance whenever you call upon them, then please consider our Professional
Subscription Support services - details can be found on our main website.

- --------------------------END INCLUDED TEXT--------------------

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