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.
Published 2017-01-27 17:59:00
Updated 2017-11-21 02:29:03
Source CERT/CC
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2016-1551

0.45%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2016-1551

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
2.6
LOW AV:N/AC:H/Au:N/C:N/I:P/A:N
4.9
2.9
NIST
3.7
LOW CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
2.2
1.4
NIST

CWE ids for CVE-2016-1551

  • Assigned by: nvd@nist.gov (Primary)

References for CVE-2016-1551

Products affected by CVE-2016-1551

  • NTP » NTP » Version: 4.2.8 Update P3
    cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:*
  • Ntpsec » Ntpsec » Version: A5fb34b9cc89b92a8fef2f459004865c93bb7f92
    cpe:2.3:a:ntpsec:ntpsec:a5fb34b9cc89b92a8fef2f459004865c93bb7f92:*:*:*:*:*:*:*
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