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...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2016-2516
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1332160
Blocks: 1331437
TreeView+ depends on / blocked
 
Reported: 2016-04-28 14:52 UTC by Martin Prpič
Modified: 2021-02-17 03:57 UTC (History)
4 users (show)

Fixed In Version: ntp 4.2.8p7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-05-02 12:56:01 UTC

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System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2300641 0 None None None 2016-05-06 01:29:08 UTC

Description Martin Prpič 2016-04-28 14:52:50 UTC 
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 11:37:40 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1332160]
Comment 2 Martin Prpič 2016-05-02 12:56:01 UTC 
Mitigation:

Disable remote configuration of NTP, or restrict this ability to trusted users.
Comment 3 Fedora Update System 2016-05-07 11:42:11 UTC 
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 17:58:37 UTC 
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 07:21:45 UTC 
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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