ESB-2017.0087

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Published:

12 January 2017

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AUSCERT External Security Bulletin Redistribution

ESB-2017.0087
Multiple vulnerabilities have been identified in BIND
12 January 2017

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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-2016-9778 CVE-2016-9444 CVE-2016-9147
CVE-2016-9131

Original Bulletin:
https://kb.isc.org/article/AA-01439/74/CVE-2016-9131
https://kb.isc.org/article/AA-01439/74/CVE-2016-9147
https://kb.isc.org/article/AA-01441/74/CVE-2016-9444
https://kb.isc.org/article/AA-01442/74/CVE-2016-9778

Comment: This bulletin contains four (4) Internet Systems Consortium security
advisories.

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CVE-2016-9131: A malformed response to an ANY query can cause an assertion
failure during recursion

Author: Michael McNally

Reference Number:
AA-01439

Created:
2017-01-11 10:31

Last Updated:
2017-01-11 22:36

CVE:
CVE-2016-9131

Document Version:
2.0

Posting date:
11 Jan 2017

Program Impacted:
BIND

Versions affected:
9.4.0 -> 9.6-ESV-R11-W1, 9.8.5 -> 9.8.8, 9.9.3 -> 9.9.9-P4, 9.9.9-S1 ->
9.9.9-S6, 9.10.0 -> 9.10.4-P4, 9.11.0 -> 9.11.0-P1
Severity:
High
Exploitable:
Remotely

Description:

A malformed query response received by a recursive server in response to
a query of RTYPE ANY could trigger an assertion failure while named is
attempting to add the RRs in the query response to the cache. While the
combination of properties which triggers the assertion should not occur in
normal traffic, it is potentially possible for the assertion to be triggered
deliberately by an attacker sending a specially-constructed answer having the
required properties, after having engineered a scenario whereby an ANY query
is sent to the recursive server for the target QNAME. A recursive server
will itself only send a query of type ANY if it receives a client query of
type ANY for a QNAME for which it has no RRsets at all in cache, otherwise
it will respond to the client with the the RRsets that it has available.

Impact:

Successful exploitation of this vulnerability will cause named to encounter
an assertion failure and stop executing, resulting in denial of service
to clients.

CVSS Score: 7.5

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

For more information on the Common Vulnerability Scoring System
and to obtain your specific environmental score please visit:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds:

The use of external packet filtering to drop client queries of RTYPE=ANY
should prevent exploitation of this vulnerability.

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 9.9.9-P5
BIND 9 version 9.10.4-P5
BIND 9 version 9.11.0-P2

BIND Supported Preview Edition is a special feature preview branch of BIND
provided to eligible ISC support customers.

BIND 9 version 9.9.9-S7

Document Revision History:

1.0 Advance Notification, 03 January 2017
2.0 Public Announcement, 11 January 2017

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-01439 is the
complete and official security advisory document.

Legal Disclaimer:
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For assistance with problems and questions for which you have not been able
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Subscription Support services - details can be found on our main website.

- ---

CVE-2016-9147: An error handling a query response containing inconsistent
DNSSEC information could cause an assertion failure
Author: Michael McNally Reference Number: AA-01440 Views: 137 Created:
2017-01-11 10:31 Last Updated: 2017-01-11 22:36 0 Rating/ Voters
CVE:
CVE-2016-9147
Document Version:
2.0
Posting date:
11 Jan 2017
Program Impacted:
BIND
Versions affected:
9.9.9-P4, 9.9.9-S6, 9.10.4-P4, 9.11.0-P1
Severity:
High
Exploitable:
Remotely

Description:

Depending on the type of query and the EDNS options in the query they
receive, DNSSEC-enabled authoritative servers are expected to include RRSIG
and other RRsets in their responses to recursive servers. DNSSEC-validating
servers will also make specific queries for DS and other RRsets. Whether
DNSSEC-validating or not, an error in processing malformed query responses
that contain DNSSEC-related RRsets that are inconsistent with other RRsets
in the same query response can trigger an assertion failure. Although the
combination of properties which triggers the assertion should not occur
in normal traffic, it is potentially possible for the assertion to be
triggered deliberately by an attacker sending a specially-constructed answer.

Impact:

This vulnerability occurs during the processing of an answer packet received
in response to a query. As a result, recursive servers are at the greatest
risk; authoritative servers are at risk only to the extent that they perform
a limited set of queries (for example, in order to do zone service - see
https://kb.isc.org/article/AA-00914/55/Why-does-my-authoritative-only-nameserver-try-to-query-the-root-nameservers.html).
There are several variations of malformed query response that can cause
an assertion failure, some of which will trigger a failure on recursive
servers that are not DNSSEC-validating.

Successful exploitation of this vulnerability will cause named to encounter
an assertion failure and stop executing, resulting in denial of service
to clients.

CVSS Score: 7.5

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds:

None known.

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 9.9.9-P5
BIND 9 version 9.10.4-P5
BIND 9 version 9.11.0-P2

BIND Supported Preview Edition is a special feature preview branch of BIND
provided to eligible ISC support customers.

BIND 9 version 9.9.9-S7

Document Revision History:

1.0 Advance Notification, 03 January 2017
1.1 Updated Versions affected to include 9.9.9-S6 and Solution to include
9.9.9-S7, 09 January 2017
2.0 Public Announcement, 11 January 2017

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/.

This Knowledge Base article https://kb.isc.org/article/AA-01440 is the
complete and official security advisory document.

- ---

CVE-2016-9444: An unusually-formed DS record response could cause an
assertion failure
Author: Michael McNally Reference Number: AA-01441 Views: 124 Created:
2017-01-11 10:31 Last Updated: 2017-01-11 22:37 0 Rating/ Voters
CVE:
CVE-2016-9444
Document Version:
2.0
Posting date:
11 Jan 2017
Program Impacted:
BIND
Versions affected:
9.6-ESV-R9 -> 9.6-ESV-R11-W1, 9.8.5 -> 9.8.8, 9.9.3 -> 9.9.9-P4, 9.9.9-S1 ->
9.9.9-S6, 9.10.0 -> 9.10.4-P4, 9.11.0 -> 9.11.0-P1
Severity:
High
Exploitable:
Remotely

Description:

An unusually-formed answer containing a DS resource record could trigger an
assertion failure. While the combination of properties which triggers the
assertion should not occur in normal traffic, it is potentially possible
for the assertion to be triggered deliberately by an attacker sending a
specially-constructed answer having the required properties.

Impact:

Successful exploitation of this vulnerability will cause named to encounter
an assertion failure and stop executing, resulting in denial of service
to clients.

CVSS Score: 7.5

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds:

None known.

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 9.9.9-P5
BIND 9 version 9.10.4-P5
BIND 9 version 9.11.0-P2

BIND Supported Preview Edition is a special feature preview branch of BIND
provided to eligible ISC support customers.

BIND 9 version 9.9.9-S7

Document Revision History:

1.0 Advance Notification, 03 January 2017
2.0 Public Announcement, 11 January 2017

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/.

This Knowledge Base article https://kb.isc.org/article/AA-01441 is the
complete and official security advisory document.

- ---

CVE-2016-9778: An error handling certain queries using the nxdomain-redirect
feature could cause a REQUIRE assertion failure in db.c
Author: Michael McNally Reference Number: AA-01442 Views: 160 Created:
2017-01-11 10:31 Last Updated: 2017-01-11 22:35 0 Rating/ Voters
CVE:
CVE-2016-9778
Document Version:
2.0
Posting date:
11 Jan 2017
Program Impacted:
BIND
Versions affected:
9.9.8-S1 -> 9.9.8-S3, 9.9.9-S1 -> 9.9.9-S6, 9.11.0-9.11.0 -> P1
Severity:
High (for affected configurations)
Exploitable:
Remotely

Description:

An error in handling certain queries can cause an assertion failure when
a server is using the nxdomain-redirect feature to cover a zone for which
it is also providing authoritative service. A vulnerable server could be
intentionally stopped by an attacker if it was using a configuration that
met the criteria for the vulnerability and if the attacker could cause it
to accept a query that possessed the required attributes.

Please note: This vulnerability affects the "nxdomain-redirect" feature,
which is one of two methods of handling NXDOMAIN redirection, and is only
available in certain versions of BIND. Redirection using zones of type
"redirect" is not affected by this vulnerability.

Impact:

Only servers which are performing NXDOMAIN redirection using the
"nxdomain-redirect" function are potentially vulnerable and then only a
subset of those servers. In order to be affected a server must be using
nxdomain-redirect AND must be redirecting NXDOMAIN responses for a zone
for which the server also provides authoritative service -- therefore a
purely recursive server is not at risk, either. Successful exploitation of
the vulnerability will cause named to stop execution after encountering a
REQUIRE assertion failure in db.c, resulting in denial of service to clients.

CVSS Score: 7.5

CVSSv3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Workarounds:

Either provide an ordinary (that is: not redirected) NXDOMAIN for
non-existent resource records in zones for which authoritative data is served
on the same server or use redirect zones instead of the nxdomain-redirect
feature.

Active exploits:

No known active exploits.

Solution: Upgrade to the patched release most closely related
to your current version of BIND. These can be downloaded from
http://www.isc.org/downloads.

BIND 9 version 9.11.0-P2

BIND Supported Preview Edition is a special feature preview branch of BIND
provided to eligible ISC support customers.

BIND 9.9.9-S7

Document Revision History:

1.0 Advance Notification, 03 January 2017
1.1 Updated Versions affected to include 9.11.0-P1, 04 January 2017
2.0 Public Announcement, 11 January 2017

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/.

This Knowledge Base article https://kb.isc.org/article/AA-01442 is the
complete and official security advisory document.

2001-2017 Internet Systems Consortium

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