Bug 1411377 (CVE-2016-9444)

Summary: CVE-2016-9444 bind: assertion failure while handling an unusually-formed DS record response
Product: [Other] Security Response Reporter: Dhiru Kholia <dkholia>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact: Petr Sklenar <psklenar>
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: pemensik, security-response-team, slawomir, slong, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
A denial of service flaw was found in the way BIND handled an unusually-formed DS record response. A remote attacker could use this flaw to make named exit unexpectedly with an assertion failure via a specially crafted DNS response.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2017-07-25 20:46:11 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1411417, 1411418, 1412462, 1412463, 1457189    
Bug Blocks: 1411339    

Description Dhiru Kholia 2017-01-09 15:10:40 UTC 
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.

This description is borrowed from the upstream advisory.
Comment 1 Dhiru Kholia 2017-01-09 15:10:56 UTC 
Acknowledgments:

Name: ISC
Comment 4 Dhiru Kholia 2017-01-12 05:17:55 UTC 
Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1412462]
Comment 5 Dhiru Kholia 2017-01-12 05:18:01 UTC 
Created bind99 tracking bugs for this issue:

Affects: fedora-all [bug 1412463]
Comment 6 Dhiru Kholia 2017-01-12 05:18:42 UTC 
External References:

https://kb.isc.org/article/AA-01441
Comment 7 errata-xmlrpc 2017-01-16 05:51:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:0062 https://rhn.redhat.com/errata/RHSA-2017-0062.html
Comment 9 errata-xmlrpc 2017-06-28 09:01:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Extended Update Support

Via RHSA-2017:1583 https://access.redhat.com/errata/RHSA-2017:1583