CVE-2017-3136: An error handling synthesized records could cause an assertion failure when using DNS64 with "break-dnssec yes;"
mcnally at isc.org
Thu Apr 13 00:03:49 UTC 2017
Document Version: 2.0
Posting date: 12 April 2017
Program Impacted: BIND
Versions affected: 9.8.0 -> 9.8.8-P1, 9.9.0 -> 9.9.9-P6,
9.10.0 -> 9.10.4-P6, 9.10.5b1->9.10.5rc1,
9.11.0 -> 9.11.0-P3, 9.11.1b1->9.11.1rc1,
9.9.3-S1 -> 9.9.9-S8
Severity: Medium, but only a risk to systems with
A query with a specific set of characteristics could cause a
server using DNS64 to encounter an assertion failure and terminate.
An attacker could deliberately construct a query, enabling
denial-of-service against a server if it was configured to use
the DNS64 feature and other preconditions were met.
Servers are at risk if they are configured to use DNS64 and if
the option "break-dnssec yes;" is in use.
CVSS Score: 5.9
CVSS Vector: CVSS:3.0/AV:N/AC:H/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:
Servers which have configurations which require DNS64 and
"break-dnssec yes;" should upgrade. Servers which are not using
these features in conjunction are not at risk from this defect.
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-P8
- BIND 9 version 9.10.4-P8
- BIND 9 version 9.11.0-P5
BIND Supported Preview Edition is a special feature preview
branch of BIND provided to eligible ISC support customers.
- BIND 9 version 9.9.9-S10
New development releases of BIND are also available which contain
the fix for this vulnerability:
- BIND 9 version 9.9.10rc3
- BIND 9 version 9.10.5rc3
- BIND 9 version 9.11.1rc3
ISC would like to thank Oleg Gorokhov of Yandex for making us
aware of this vulnerability.
Document Revision History:
1.0 Advance Notification 08 March 2017
1.1 Revised Publication Date; Added pre-releases to Versions Affected
20 March 2017
2.0 Public Announcement 12 April 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.
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Security Notifications, please visit http://www.isc.org/support/.
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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-01465 is
the complete and official security advisory document.
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