Bug 1466193 (CVE-2017-3143)

Summary: CVE-2017-3143 bind: An error in TSIG authentication can permit unauthorized dynamic updates
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: code, dkholia, jpopelka, mruprich, msehnout, pemensik, security-response-team, slawomir, thozza, vonsch, yozone, zdohnal
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: bind 9.9.10-P2, bind 9.10.5-P2,bind 9.11.1-P2 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way BIND handled TSIG authentication for dynamic updates. A remote attacker able to communicate with an authoritative BIND server could use this flaw to manipulate the contents of a zone, by forging a valid TSIG or SIG(0) signature for a dynamic update request.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2017-07-06 08:27:26 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1466206, 1466207, 1466208, 1466209, 1466609, 1466610, 1466807    
Bug Blocks: 1466195    

Description Adam Mariš 2017-06-29 08:47:16 UTC 
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. A server that relies solely on TSIG or SIG(0) keys with no other address-based ACL protection could be vulnerable to malicious zone content manipulation using this technique.

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 parallel. 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-ACLs-with-both-addresses-and-keys.html.

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).

Upstream patch:

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=581c1526ab
Comment 1 Adam Mariš 2017-06-29 08:47:23 UTC 
Acknowledgments:

Name: Internet Systems Consortium
Upstream: Clement Berthaux (Synacktiv)
Comment 3 Dhiru Kholia 2017-06-30 04:23:50 UTC 
External References:

https://kb.isc.org/article/AA-01503
Comment 4 Dhiru Kholia 2017-06-30 04:24:59 UTC 
Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1466609]


Created bind99 tracking bugs for this issue:

Affects: fedora-all [bug 1466610]
Comment 7 Dhiru Kholia 2017-07-03 10:28:38 UTC 
Mitigation:

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 parallel. 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-ACLs-with-both-addresses-and-keys.html
Comment 8 errata-xmlrpc 2017-07-05 09:17:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1680 https://access.redhat.com/errata/RHSA-2017:1680
Comment 9 errata-xmlrpc 2017-07-05 09:27:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:1679 https://access.redhat.com/errata/RHSA-2017:1679