CVE: CVE-2017-3143
Document Version: 2.0
Posting date: 29 June 2017
Program Impacted: BIND
Versions affected: 9.4.0 -> 9.8.8, 9.9.0 -> 9.9.10-P1, 9.10.0 ->
9.10.5-P1,
9.11.0 -> 9.11.1-P1, 9.9.3-S1 -> 9.9.10-S2,
9.10.5-S1 -> 9.10.5-S2
Severity: High
Exploitable: Remotely
Description:
An attacker who is able to send and receive messages to an
authoritative DNS server and who has knowledge of a valid TSIG
key name for the zone and service being targeted may be able
to manipulate BIND into accepting an unauthorized dynamic update.
Impact:
A server that relies solely on TSIG keys with no other address-based
ACL protection could be vulnerable to malicious zone content
manipulation using this technique.
CVSS Score: 7.5
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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:H/A:N
Workarounds:
The effects of this vulnerability can be mitigated by using
Access Control Lists (ACLs) that require both address range
validation and use of TSIG authentication in conjunction. For
information on how to configure this type of compound authentication
control, please see:
https://kb.isc.org/article/AA-00723/0/Using-Access-Control-Lists
Administrators who have made use of named.conf option "update-policy
local;" should refer to the Administrator Reference Manual (ARM)
for details of the automatic update policy that will be established
and to assess whether or not this conveys any additional risk
to their server. (Note that this option is not enabled by
default).
Active exploits:
No known active exploits but a similar issue was announced
publicly on 23 June 2017 by another DNS server software provider.
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 9.9.10-P2
- BIND 9 version 9.10.5-P2
- BIND 9 version 9.11.1-P2
BIND Supported Preview Edition is a special feature preview
branch of BIND provided to eligible ISC support customers.
- BIND 9 version 9.9.10-S3
- BIND 9 version 9.10.5-S3
Acknowledgements:
ISC would like to thank Clément Berthaux from Synacktiv for
reporting this issue.
Document Revision History:
1.0 Advance Notification 26 June 2017
1.1 CVSS score corrected (was previously erroneously listed
as 7.8) 27 June 2017
1.2 Update phrasing in the Workarounds section; Correct date of similar
public announcement, 29 June 2017
1.3 Remove references to SIG(0), which is not affected, 29 June 2017
2.0 Public disclosure 29 June 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/.
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should go to security-offi...@isc.org. To report a new issue,
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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
This Knowledge Base article https://kb.isc.org/article/AA-01503 is
the complete and official security advisory document.
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