Bug 1274254 - (CVE-2015-7691, CVE-2015-7692, CVE-2015-7702) CVE-2015-7691 CVE-2015-7692 CVE-2015-7702 ntp: incomplete checks in ntp_crypto.c
CVE-2015-7691 CVE-2015-7692 CVE-2015-7702 ntp: incomplete checks in ntp_crypto.c
Status: CLOSED ERRATA
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=20151021,repor...
: Security
Depends On: 1274351 1296207 1317795
Blocks: 1260670 1323912
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Reported: 2015-10-22 07:28 EDT by Martin Prpič
Modified: 2016-11-06 00:13 EDT (History)
9 users (show)

See Also:
Fixed In Version: ntp 4.2.8p4
Doc Type: Bug Fix
Doc Text:
It was found that the fix for CVE-2014-9750 was incomplete: three issues were found in the value length checks in NTP's ntp_crypto.c, where a packet with particular autokey operations that contained malicious data was not always being completely validated. A remote attacker could use a specially crafted NTP packet to crash ntpd.
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Last Closed: 2016-11-06 00:13:38 EDT
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RHEL 7.3 requirements from Atomic Host:
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Tracker ID Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 2024443 None None None Never

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Description Martin Prpič 2015-10-22 07:28:47 EDT
It was found that the fix for CVE-2014-9750 was incomplete: three issues were found in the value length checks in ntp_crypto.c, where a packet with particular autokey operations that contained malicious data was not always being completely validated. Receipt of these packets can cause ntpd to crash.

Upstream patch:

https://github.com/ntp-project/ntp/commit/c4cd4aaf418f57f7225708a93bf48afb2bc9c1da

Mitigation:

Disable NTP autokey authentication by removing, or commenting out, all configuration directives beginning with the 'crypto' keyword in your ntp.conf file.

External References:

https://github.com/ntp-project/ntp/blob/stable/NEWS#L11
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
Comment 1 Martin Prpič 2015-10-22 10:34:32 EDT
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1274351]
Comment 6 Fedora Update System 2015-11-02 13:52:49 EST
ntp-4.2.6p5-34.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2015-11-04 17:49:26 EST
ntp-4.2.6p5-34.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
Comment 14 Fedora Update System 2016-02-20 21:25:08 EST
ntp-4.2.6p5-36.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 18 errata-xmlrpc 2016-05-10 16:17:26 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0780 https://rhn.redhat.com/errata/RHSA-2016-0780.html
Comment 19 errata-xmlrpc 2016-11-03 15:32:55 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2583 https://rhn.redhat.com/errata/RHSA-2016-2583.html

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