Bug 1340852 – CVE-2016-4953 ntp: bad authentication demobilizes ephemeral associations

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Bug 1340852 - (CVE-2016-4953) CVE-2016-4953 ntp: bad authentication demobilizes ephemeral associations

Summary:	CVE-2016-4953 ntp: bad authentication demobilizes ephemeral associations

Status:	CLOSED NOTABUG

Aliases:	CVE-2016-4953

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

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=low,public=20160602,reported=2...
Keywords:	Security

Depends On:
Blocks:	1302226
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Reported:	2016-05-30 08:23 EDT by Martin Prpič
Modified:	2016-06-02 10:30 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	ntp-4.2.8p7
Doc Type:	If docs needed, set a value
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Environment:
Last Closed:	2016-05-30 09:07:19 EDT
Type:	---
Regression:	---
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RHEL 7.3 requirements from Atomic Host:
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Description Martin Prpič 2016-05-30 08:23:55 EDT

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 08:23:59 EDT

Acknowledgments:

Name: Miroslav Lichvar (Red Hat)

Comment 2 Martin Prpič 2016-05-30 09:07:19 EDT

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 09:41:44 EDT

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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