Bug 1397329 (CVE-2016-7427) - CVE-2016-7427 ntp: Broadcast Mode Replay Prevention DoS
Summary: CVE-2016-7427 ntp: Broadcast Mode Replay Prevention DoS
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2016-7427
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1397349
TreeView+ depends on / blocked
 
Reported: 2016-11-22 10:33 UTC by Adam Mariš
Modified: 2021-02-17 03:00 UTC (History)
5 users (show)

Fixed In Version: ntp 4.2.8p9
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Clone Of:
Environment:
Last Closed: 2016-12-20 04:20:07 UTC
Embargoed:

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Description Adam Mariš 2016-11-22 10:33:14 UTC 
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 11:09:06 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1397351]
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