Bug 1331467 – CVE-2016-2517 ntp: certain remote configuration values not properly validated

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Bug 1331467 - (CVE-2016-2517) CVE-2016-2517 ntp: certain remote configuration values not properly validated

Summary:	CVE-2016-2517 ntp: certain remote configuration values not properly validated

Status:	CLOSED NOTABUG

Aliases:	CVE-2016-2517

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20160426,reported=2...
Keywords:	Security

Depends On:	1332160
Blocks:	1331437
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Reported:	2016-04-28 10:53 EDT by Martin Prpič
Modified:	2016-05-14 03:15 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	ntp 4.2.8p7
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-05-02 08:51:14 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Knowledge Base (Solution)	2300641	None	None	None	2016-05-05 21:29 EDT

Groups: None (edit)

Description Martin Prpič 2016-04-28 10:53:12 EDT

The following flaw was found in ntpd:

If ntpd was expressly configured to allow for remote configuration, a malicious user who knows the controlkey for ntpq or the requestkey for ntpdc (if mode7 is expressly enabled) can create a session with ntpd and then send a crafted packet to ntpd that will change the value of the trustedkey, controlkey, or requestkey to a value that will prevent any subsequent authentication with ntpd until ntpd is restarted. 

Upstream bugs:

http://support.ntp.org/bin/view/Main/NtpBug3010

External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security

Comment 1 Martin Prpič 2016-05-02 07:37:53 EDT

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1332160]

Comment 2 Martin Prpič 2016-05-02 08:51:14 EDT

Statement:

Red Hat Product Security does not consider this to be a security issue. An authenticated user could use various other means to disable access to an NTP server (for example, using the 'restrict' command). To mitigate this issue, disable remote configuration of NTP, or restrict this ability to trusted users.

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