Bug 1331466 - (CVE-2016-2516) CVE-2016-2516 ntp: assertion failure in ntpd on duplicate IPs on unconfig directives
CVE-2016-2516 ntp: assertion failure in ntpd on duplicate IPs on unconfig dir...
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20160426,repor...
: 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)
4 users (show)

See Also:
Fixed In Version: ntp 4.2.8p7
Doc Type: Bug Fix
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Last Closed: 2016-05-02 08:56:01 EDT
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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

  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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