Improper Data Handling Affecting ntp package, versions [0,4.2.8p7)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.86% (83rd percentile)

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  • Snyk IDSNYK-UNMANAGED-NTP-2382714
  • published26 Jan 2022
  • disclosed6 Jan 2017
  • creditUnknown

Introduced: 6 Jan 2017

CVE-2016-1548  (opens in a new tab)
CWE-19  (opens in a new tab)

How to fix?

Upgrade ntp to version 4.2.8p7 or higher.

Overview

Affected versions of this package are vulnerable to Improper Data Handling. An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

CVSS Scores

version 3.1