Bug 1397329 – CVE-2016-7427 ntp: Broadcast Mode Replay Prevention DoS

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Bug 1397329 - (CVE-2016-7427) CVE-2016-7427 ntp: Broadcast Mode Replay Prevention DoS

Summary:	CVE-2016-7427 ntp: Broadcast Mode Replay Prevention DoS

Status:	CLOSED NOTABUG

Aliases:	CVE-2016-7427

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

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20161121,repor...
Keywords:	Security

Depends On:
Blocks:	1397349
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Reported:	2016-11-22 05:33 EST by Adam Mariš
Modified:	2017-01-29 22:18 EST (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	ntp 4.2.8p9
Doc Type:	If docs needed, set a value
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Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-12-19 23:20:07 EST
Type:	---
Regression:	---
Mount Type:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Adam Mariš 2016-11-22 05:33:14 EST

The broadcast mode of NTP is expected to only be used in a trusted network. If the broadcast network is accessible to an attacker, a potentially exploitable denial of service vulnerability in ntpd's broadcast mode replay prevention functionality can be abused. An attacker with access to the NTP broadcast domain can periodically inject specially crafted broadcast mode NTP packets into the broadcast domain which, while being logged by ntpd, can cause ntpd to reject broadcast mode packets from legitimate NTP broadcast servers.

External References:

http://support.ntp.org/bin/view/Main/NtpBug3114

Comment 1 Adam Mariš 2016-11-22 06:09:06 EST

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1397351]

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