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Security Features The advisory has been revoked - it doesn't affect any version of package ntp  (opens in a new tab)

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0.5% (77th percentile)

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  • Snyk IDSNYK-UBUNTU1404-NTP-622840
  • published10 Sept 2020
  • disclosed27 Jan 2017
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Introduced: 27 Jan 2017

CVE-2016-1551  (opens in a new tab)
CWE-254  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:14.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ntp package and not the ntp package as distributed by Ubuntu.

ntpd in NTP 4.2.8p3 and NTPsec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 relies on the underlying operating system to protect it from requests that impersonate reference clocks. Because reference clocks are treated like other peers and stored in the same structure, any packet with a source ip address of a reference clock (127.127.1.1 for example) that reaches the receive() function will match that reference clock's peer record and will be treated as a trusted peer. Any system that lacks the typical martian packet filtering which would block these packets is in danger of having its time controlled by an attacker.