BIND RPZ and DNS64 State Error Lets Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID: 1037801|
SecurityTracker URL: http://securitytracker.com/id/1037801
(Links to External Site)
Date: Feb 9 2017
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): 9.9.3-S1 - 9.9.9-S7, 9.9.3 - 9.9.9-P5, 9.9.10b1, 9.10.0 - 9.10.4-P5, 9.10.5b1, 9.11.0 - 9.11.0-P2, 9.11.1b1|
A vulnerability was reported in BIND. A remote user can cause the target service to crash in certain cases.|
A remote user can trigger a state error in query processing and cause the target service to crash.
Some configurations using both Response Policy Zones (RPZ) and DNS64 to rewrite query responses are affected.
Ramesh Damodaran (Infoblox) and Aliaksandr Shubnik (Infoblox) reported this vulnerability.
A remote user can cause the target service to crash.|
The vendor has issued a fix (9.9.9-P6, 9.10.4-P6, 9.11.0-P3).|
The vendor advisory is available at:
Vendor URL: kb.isc.org/article/AA-01453 (Links to External Site)
|Underlying OS: Linux (Any), UNIX (Any)|
This archive entry has one or more follow-up message(s) listed below.|
Source Message Contents
Subject: CVE-2017-3135: Combination of DNS64 and RPZ Can Lead to Crash|
Some configurations using both DNS64 and RPZ can lead to an INSIST
assertion failure or a NULL pointer read; in either case named will
Document Version: 2.0
Posting date: 08 Feb 2017
Program Impacted: BIND
Versions affected: 9.9.3-S1 -> 9.9.9-S7, 9.9.3 -> 9.9.9-P5, 9.9.10b1,
9.10.0 -> 9.10.4-P5, 9.10.5b1, 9.11.0 -> 9.11.0-P2,
Severity: High, for servers with specific configurations
Exploitable: Remotely, but only affecting servers with specific
Under some conditions when using both DNS64 and RPZ to rewrite query
responses, query processing can resume in an inconsistent state
leading to either an INSIST assertion failure or an attempt to read
through a NULL pointer.
Servers utilizing both DNS64 and RPZ are potentially susceptible to
encountering this condition. When this condition occurs, it will
result in either an INSIST assertion failure (and subsequent abort)
or an attempt to read through a NULL pointer. On most platforms a
NULL pointer read leads to a segmentation fault (SEGFAULT), which
causes the process to be terminated.
Only servers which are configured to simultaneously use both
Response Policy Zones (RPZ) and DNS64 (a method for synthesizing
AAAA records from A records) can be affected by this vulnerability.
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:
While it is possible to avoid the condition by removing either DNS64
or RPZ from the configuration, or by carefully restricting the
contents of the policy zone, for an affected configuration the most
practical and safest course of action is to upgrade to a version of
BIND without this vulnerability.
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-P6
BIND 9 version 9.10.4-P6
BIND 9 version 9.11.0-P3
BIND Supported Preview Edition is a special feature preview branch
of BIND provided to eligible ISC support customers.
BIND 9 version 9.9.9-S8
ISC would like to thank Ramesh Damodaran(Infoblox) and Aliaksandr
Shubnik (Infoblox) for reporting the issue and assisting us in the
Document Revision History:
1.0 Advance Notification 01 Feb, 2017
2.0 Public Announcement 08 Feb, 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 Advance
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
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
This Knowledge Base article https://kb.isc.org/article/AA-01453 is the
complete and official security advisory document.
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