Bug 1315690 (CVE-2016-2088)

Summary:	CVE-2016-2088 bind: malformed packet containing multiple cookie options can trigger assertion failure
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	gagriogi, security-response-team, slawomir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bind 9.10.3-P4	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-03-15 12:37:30 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:	1316445
Bug Blocks:	1315695

Description Martin Prpič 2016-03-08 12:22:22 UTC

The following flaw, reported by ISC, was found in BIND 9.10:

BIND 9.10 has preliminary support for DNS cookies (or source identity tokens), a proposed mechanism designed to allow lightweight transaction security between a querying party and a nameserver. An error in the BIND code implementing support for this optional feature permits a deliberately misconstructed packet containing multiple cookie options to cause named to terminate with an INSIST assertion failure in resolver.c if DNS cookie support is enabled in the server. Only servers with DNS cookie support enabled at build time can be affected by this defect; in servers which do not have DNS cookie support selected any cookies encountered will be ignored as unknown option types.

Servers which are built with DNS cookie support enabled are vulnerable to denial of service if an attacker can cause them to receive and process a response that contains multiple cookie options.

External References:

https://kb.isc.org/article/AA-01351

Comment 1 Martin Prpič 2016-03-08 12:22:26 UTC

Acknowledgments:

Name: ISC

Comment 3 Huzaifa S. Sidhpurwala 2016-03-10 09:12:08 UTC

Public via:

https://kb.isc.org/article/AA-01351

Comment 4 Huzaifa S. Sidhpurwala 2016-03-10 09:36:16 UTC

Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1316445]

Comment 5 Tomas Hoger 2016-03-15 08:57:45 UTC

Upstream commit:

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=d7ff9a1c41bf0ba9773cb3adb08b48b9fd57c956

Comment 6 Stefan Cornelius 2016-03-15 12:37:30 UTC

Statement:

This issue did not affect the versions of bind97 as shipped with Red Hat Enterprise Linux 5 and bind as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include support for DNS cookies.