Bug 1176040 (CVE-2014-9296)

Summary:	CVE-2014-9296 ntp: receive() missing return on error
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	carnil, fkrska, fweimer, john.haxby, jrusnack, mdshaikh, mjc, mlichvar, ovasik, sardella, security-response-team, thozza, vkaigoro
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp 4.2.8	Doc Type:	Bug Fix
Doc Text:	A missing return statement in the receive() function could potentially allow a remote attacker to bypass NTP's authentication mechanism.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-12-20 02:46:24 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:	1176067, 1176068, 1176069, 1176070, 1176191, 1176680, 1182172
Bug Blocks:	1176041

Description Huzaifa S. Sidhpurwala 2014-12-19 09:16:00 UTC

As per upstream NTP security advisory:

Code in ntp_proto.c:receive() was missing a 'return;' in the code path where an error was detected, which meant processing did not stop when a specific rare error occurred. We haven't found a way for this bug to affect system integrity. If there is no way to affect system integrity the base CVSS score for this bug is 0. If there is one avenue through which system integrity can be partially affected, the base score becomes a 5. If system integrity can be partially affected via all three integrity metrics, the CVSS base score become 7.5.

This vulnerability was discovered by Stephen Roettger of the Google Security Team. 


Mitigation:

Remove or comment out all configuration directives beginning with the crypto keyword in your ntp.conf file.

Comment 1 Tomas Hoger 2014-12-19 09:23:12 UTC

Upstream change to the NEWS file with details quoted in comment 0:

http://bk1.ntp.org/ntp-dev/?PAGE=patch&REV=5493dc3dofY6drKJde9W-5O1M3s4eg

Upstream bug:
http://bugs.ntp.org/show_bug.cgi?id=2670

Upstream commit:
http://bk1.ntp.org/ntp-dev/?PAGE=patch&REV=548ad06feXHK1HlZoY-WZVyynwvwAg

Comment 5 Huzaifa S. Sidhpurwala 2014-12-19 14:22:44 UTC

External References:

https://access.redhat.com/articles/1305723
http://support.ntp.org/bin/view/Main/SecurityNotice#receive_missing_return_on_error

Comment 6 Tomas Hoger 2014-12-19 16:22:02 UTC

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1176191]

Comment 7 errata-xmlrpc 2014-12-20 02:40:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2014:2024 https://rhn.redhat.com/errata/RHSA-2014-2024.html

Comment 8 Fedora Update System 2014-12-22 02:37:36 UTC

ntp-4.2.6p5-19.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2014-12-23 18:28:43 UTC

ntp-4.2.6p5-25.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Fedora Update System 2014-12-31 19:00:36 UTC

ntp-4.2.6p5-13.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 14 Vincent Danen 2015-01-07 14:28:13 UTC

Statement:

This issue did not affect the versions of ntpd as shipped with Red Hat Enterprise Linux 4 and 5.  It has been addressed in Red Hat Enterprise Linux 6 and 7 via RHSA-2014:2024.

Comment 16 errata-xmlrpc 2015-01-28 18:52:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 EUS - Server and Compute Node Only

Via RHSA-2015:0104 https://rhn.redhat.com/errata/RHSA-2015-0104.html