Bug 1398350 (CVE-2016-9311)

Summary:	CVE-2016-9311 ntp: Null pointer dereference when trap service is enabled
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	apmukher, bhoefer, fleite, huzaifas, keyur.three0, mlichvar, sardella, slawomir, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp 4.2.8p9	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way ntpd implemented the trap service. A remote attacker could send a specially crafted packet to cause a null pointer dereference that will crash ntpd, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-02-06 06:50:46 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:	1397351, 1411642, 1411643, 1411644, 1411645
Bug Blocks:	1397349

Description Adam Mariš 2016-11-24 14:01:56 UTC

If trap service, disabled by default, has been explicitly enabled, an attacker can send a specially crafted packet to cause a null pointer dereference that will crash ntpd, resulting in a denial of service.

External References:

http://support.ntp.org/bin/view/Main/NtpBug3119

Comment 1 Huzaifa S. Sidhpurwala 2016-12-14 08:16:49 UTC

Mitigation:

Use "restrict default noquery ..." in your ntp.conf file. Only allow mode 6 queries from trusted networks and hosts.

Comment 5 Keyur Pujara 2017-01-16 11:31:11 UTC

Is an RPM released with fix for this. I haven't seen one @ http://mirror.centos.org. 

If not released, what is ETA for same?

Thanks, Keyur

Comment 7 errata-xmlrpc 2017-02-06 06:17:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2017:0252 https://rhn.redhat.com/errata/RHSA-2017-0252.html