Bug 1353565 (CVE-2016-6172)

Summary:	CVE-2016-6172 pdns: 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:	ms, ruben, sander
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 13:27:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1353566, 1353567
Bug Blocks:

Description Adam Mariš 2016-07-07 13:10:56 UTC

It was found that PowerDNS 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

Proposed patch:

https://github.com/sischkg/xfer-limit/blob/master/powerdns-3.4.7-xfer-limit-0.0.1.patch

Comment 1 Adam Mariš 2016-07-07 13:11:54 UTC

Created pdns tracking bugs for this issue:

Affects: fedora-all [bug 1353566]
Affects: epel-all [bug 1353567]

Comment 2 Martin Prpič 2016-07-08 06:42:24 UTC

Upstream issue:

https://github.com/PowerDNS/pdns/issues/4128

The following patches are still under review but should be merged soon:

- Master: https://github.com/PowerDNS/pdns/pull/4133
- 3.4.x: https://github.com/PowerDNS/pdns/pull/4134

Comment 3 Fedora Update System 2016-08-08 20:23:57 UTC

pdns-4.0.1-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.