Bug 1300654 (CVE-2015-8139)

Summary:	CVE-2015-8139 ntp: ntpq and ntpdc disclose origin timestamp to unauthenticated clients
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mlichvar, sardella
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp-4.2.8p6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-01-21 13:33:45 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:	1300277, 1342128
Bug Blocks:	1297474

Description Andrej Nemec 2016-01-21 11:17:44 UTC

To prevent off-path attackers from impersonating legitimate peers, clients require that the origin timestamp in a received response packet match the transmit timestamp from its last request to a given peer. Under assumption that only the recipient of the request packet will know the value of the transmit timestamp, this prevents an attacker from forging replies

Upstream bug report:

http://support.ntp.org/bin/view/Main/NtpBug2946

Comment 1 Martin Prpič 2016-01-21 11:26:14 UTC

External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_p6_NTP_Security_Vul
http://www.talosintel.com/reports/TALOS-2016-0078/

Comment 2 Martin Prpič 2016-01-21 13:33:45 UTC

Upstream has not released a fix for this issue and has opted for publishing a mitigation instead.

Mitigation:

This issue can be mitigated by one of the following methods: adding the noquery option to all restrict entries in ntp.conf, configuring ntpd to get time from multiple sources, or using a restriction list in your ntp.conf to limit who is allowed to issue ntpq and ntpdc queries. Note that ntpdc queries are disabled by default.

Comment 3 Fedora Update System 2016-06-18 18:47:20 UTC

ntp-4.2.6p5-41.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-07-02 19:26:42 UTC

ntp-4.2.6p5-41.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-07-02 19:32:30 UTC

ntp-4.2.6p5-41.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.