Bug 1331466 – CVE-2016-2516 ntp: assertion failure in ntpd on duplicate IPs on unconfig directives

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Bug 1331466 - (CVE-2016-2516) CVE-2016-2516 ntp: assertion failure in ntpd on duplicate IPs on unconfig directives

Summary:	CVE-2016-2516 ntp: assertion failure in ntpd on duplicate IPs on unconfig dir...

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-2516

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

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

URL:
Whiteboard:	impact=moderate,public=20160426,repor...
Keywords:	Security

Depends On:	1332160
Blocks:	1331437
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Reported:	2016-04-28 10:52 EDT by Martin Prpič
Modified:	2016-05-12 03:21 EDT (History)
CC List:	4 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 08:56:01 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 10:52:50 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 if an existing association is unconfigured using the same IP twice on the unconfig directive line, ntpd will abort.

Upstream bugs:

http://support.ntp.org/bin/view/Main/NtpBug3011

External References:

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

Comment 1 Martin Prpič 2016-05-02 07:37:40 EDT

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1332160]

Comment 2 Martin Prpič 2016-05-02 08:56:01 EDT

Mitigation:

Disable remote configuration of NTP, or restrict this ability to trusted users.

Comment 3 Fedora Update System 2016-05-07 07:42:11 EDT

ntp-4.2.6p5-40.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 2016-05-10 13:58:37 EDT

ntp-4.2.6p5-40.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-05-12 03:21:45 EDT

ntp-4.2.6p5-40.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

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