CVE-2016-9444: An unusually-formed DS record response could cause an assertion failure
mcnally at isc.org
Wed Jan 11 22:35:35 UTC 2017
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
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.
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
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:
No known active exploits.
Upgrade to the patched release most closely related to your
current version of BIND. These can all be downloaded from
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
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
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ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on
which versions are actively supported, please see
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Details of our current security advisory policy and practice can
be found here: https://kb.isc.org/article/AA-00861
This Knowledge Base article https://kb.isc.org/article/AA-01441 is
the complete and official security advisory document.
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