Bug 1171912 (CVE-2014-8500)

Summary:	CVE-2014-8500 bind: delegation handling denial of service
Product:	[Other] Security Response	Reporter:	Murray McAllister <mmcallis>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	chazlett, fahnoe, hannsj_uhl, hayato.suzuki, jrusnack, marianne, parmstro, psimerda, redhat-bugzilla, thozza, tkubota, tnagata, vchepkov, vdanen, vonsch, yohmura, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bind 9.9.6-P1, bind 9.10.1-P1	Doc Type:	Bug Fix
Doc Text:	A denial of service flaw was found in the way BIND followed DNS delegations. A remote attacker could use a specially crafted zone containing a large number of referrals which, when looked up and processed, would cause named to use excessive amounts of memory or crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-12-12 03:54:47 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:	1171913, 1171971, 1171972, 1171973, 1171974, 1171975, 1171976, 1300760, 1300761
Bug Blocks:	1171914

Description Murray McAllister 2014-12-08 23:07:25 UTC

The BIND 9.9.6-P1 and 9.10.1-P1 release fix the following flaw:

""
By making use of maliciously-constructed zones or a rogue server, an attacker can exploit an oversight in the code BIND 9 uses to follow delegations in the Domain Name Service, causing BIND to issue unlimited queries in an attempt to follow the delegation.  This can lead to resource exhaustion and denial of service (up to and including termination of the named server process.)

All recursive resolvers are affected.  Authoritative servers can be affected if an attacker can control a delegation traversed by the authoritative server in servicing the zone.
""

It is reported that versions 9.0.x to 9.8.x, 9.9.0 to 9.9.6, and 9.10.0 to 9.10.1 are affected.

External References:

https://kb.isc.org/article/AA-01216/74/CVE-2014-8500%3A-A-Defect-in-Delegation-Handling-Can-Be-Exploited-to-Crash-BIND.html

Comment 1 Murray McAllister 2014-12-08 23:09:04 UTC

Created bind tracking bugs for this issue:

Affects: fedora-all [bug 1171913]

Comment 8 Tomas Hoger 2014-12-09 12:38:10 UTC

Upstream commits for bind 9.9:

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=603a0e2637b35a2da820bc807f69bcf09c682dce
https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;h=711e833921d3dd67df7515438e152bbfdb2c1249

Comment 9 Tomáš Hozza 2014-12-10 08:48:53 UTC

(In reply to Tomas Hoger from comment #8)
> Upstream commits for bind 9.9:
> 
> https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;
> h=603a0e2637b35a2da820bc807f69bcf09c682dce
> https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commitdiff;
> h=711e833921d3dd67df7515438e152bbfdb2c1249

Also:

https://source.isc.org/cgi-bin/gitweb.cgi?p=bind9.git;a=commit;h=6cd340997bad88472dfd80b86192a57205ab1c8e

Comment 12 errata-xmlrpc 2014-12-12 02:10:16 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:1985 https://rhn.redhat.com/errata/RHSA-2014-1985.html

Comment 13 errata-xmlrpc 2014-12-12 03:41:24 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 5

Via RHSA-2014:1984 https://rhn.redhat.com/errata/RHSA-2014-1984.html

Comment 14 Tomas Hoger 2014-12-12 20:14:02 UTC

Advisory from the original reporter ANSSI, the French Network and Information Security Agency:

http://www.ssi.gouv.fr/en/the-anssi/events/vulnerabilty-disclosure-the-infinitely-delegating-name-servers-idns-attack.html

Comment 15 Fedora Update System 2014-12-18 06:10:45 UTC

bind-9.9.4-17.P2.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 16 Fedora Update System 2015-01-06 06:05:01 UTC

bind-9.9.6-5.P1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 17 Fedora Update System 2015-01-06 06:14:09 UTC

bind-9.9.3-16.P2.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 19 errata-xmlrpc 2016-01-28 13:27:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 AUS - Server Only
  Red Hat Enterprise Linux 6.4 AUS - Server Only

Via RHSA-2016:0078 https://rhn.redhat.com/errata/RHSA-2016-0078.html