Bug 1353576 (CVE-2016-6173)

Summary:	CVE-2016-6173 nsd: Improper restriction of zone size limit
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	drjohnson1, fale, jv+fedora, pwouters, tis
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-07-07 13:28:09 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:	1353577, 1353578
Bug Blocks:

Description Adam Mariš 2016-07-07 13:21:43 UTC

It was found that NSD does not implement reasonable restrictions for zone sizes. This allows an explicitly configured primary DNS server for a zone to crash a secondary DNS server, affecting service of other zones hosted on the same secondary server.

CVE request:

http://seclists.org/oss-sec/2016/q3/19

Upstream bug:

https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=790

Proposed patches:

https://github.com/sischkg/xfer-limit/blob/master/nsd-4.1.10-xfer-limit-0.0.2.patch
https://github.com/sischkg/xfer-limit/blob/master/nsd-4.1.10-xfer-limit-0.0.3.patch
https://github.com/sischkg/xfer-limit/blob/master/nsd-4.1.5-xfer-limit-0.0.1.patch

Comment 1 Adam Mariš 2016-07-07 13:22:10 UTC

Created nsd tracking bugs for this issue:

Affects: fedora-all [bug 1353577]
Affects: epel-all [bug 1353578]