Bug 1340852 (CVE-2016-4953) - CVE-2016-4953 ntp: bad authentication demobilizes ephemeral associations
Summary: CVE-2016-4953 ntp: bad authentication demobilizes ephemeral associations
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2016-4953
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1302226
TreeView+ depends on / blocked
 
Reported: 2016-05-30 12:23 UTC by Martin Prpič
Modified: 2021-02-17 03:48 UTC (History)
3 users (show)

Fixed In Version: ntp-4.2.8p7
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Environment:
Last Closed: 2016-05-30 13:07:19 UTC
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Description Martin Prpič 2016-05-30 12:23:55 UTC 
It was found that the fixes for CVE-2015-7979 and CVE-2016-1547 were incomplete: An attacker can send a spoofed packet that contains an invalid MAC to a client/peer and demobilize its ephemeral association.
Comment 1 Martin Prpič 2016-05-30 12:23:59 UTC 
Acknowledgments:

Name: Miroslav Lichvar (Red Hat)
Comment 2 Martin Prpič 2016-05-30 13:07:19 UTC 
Statement:

This issue did not affect the versions of ntp as shipped with any Red Hat Enterprise Linux version as they already included a fix for this issue in the patch provided to fix the CVE-2015-7979 issue. The fix for this issue (developed by Red Hat) was different from the one provided by upstream, and thus ntp versions in RHEL are not affected by CVE-2016-4953.
Comment 3 Martin Prpič 2016-06-02 13:41:44 UTC 
Upstream bug:

http://support.ntp.org/bin/view/Main/NtpBug3045

External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#June_2016_ntp_4_2_8p8_NTP_Securi
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