Bug 679496 (CVE-2011-0414)

Summary:	CVE-2011-0414 bind: named lockup with IXFR or DDNS update and a high query rate
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	atkac, bressers, wnefal+redhatbugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-07-13 10:06:30 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:	679560
Bug Blocks:

Description Vincent Danen 2011-02-22 18:09:27 UTC

It was reported [1] that when the BIND authoritative name server daemon (named) processed a successful IXFR transfer or a dynamic update, there was a small period of time during which the IXFR/update, along with a query, could cause the server to stop processing all requests.  A higher update and/or query rate would increase the probability of the deadlock occurring.

This flaw only affects BIND 9.7.1 and 9.7.2; upstream has released 9.7.3 to
correct this flaw.  Upstream also documents that using the "-n1" option to
cause named to use only one worker thread would mitigate this problem.

[1] https://www.isc.org/software/bind/advisories/cve-2011-0414

Comment 1 Vincent Danen 2011-02-22 20:46:43 UTC

Upstream verified to me that this was introduced in 9.7.1, so bind in RHEL6 is not vulnerable.

The fix is also noted as:

Corrected a defect where a combination of dynamic updates and zone transfers incorrectly locked the in-memory zone database, causing named to  freeze. [RT #22614]

in http://ftp.isc.org/isc/bind9/9.7.3/RELEASE-NOTES-BIND-9.7.3.html

9.7.3 is currently in Fedora 13 and 14 testing repositories.

Comment 2 Vincent Danen 2011-02-22 20:47:33 UTC

Statement:

Not vulnerable. This issue did not affect the versions of bind as shipped with Red Hat Enterprise Linux 4, 5, or 6.