Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2016-1548

Published: Jan 06, 2017 | Modified: Apr 20, 2025
CVSS 3.x
7.2
HIGH
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
CVSS 2.x
6.4 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:P
RedHat/V2
6.4 MODERATE
AV:N/AC:L/Au:N/C:N/I:P/A:P
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2016-1548
CWEhttps://cwe.mitre.org/data/definitions/19.html

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.

Affected Software

NameVendorStart VersionEnd Version
NtpNtp4.2.8-p4 (including)4.2.8-p4 (including)
Red Hat Enterprise Linux 6RedHatntp-0:4.2.6p5-10.el6.1*
Red Hat Enterprise Linux 6.7 Extended Update SupportRedHatntp-0:4.2.6p5-5.el6_7.5*
Red Hat Enterprise Linux 7RedHatntp-0:4.2.6p5-22.el7_2.2*
NtpUbuntuesm-infra-legacy/trusty*
NtpUbuntuesm-infra/xenial*
NtpUbuntuprecise*
NtpUbuntutrusty*
NtpUbuntutrusty/esm*
NtpUbuntuupstream*
NtpUbuntuvivid/stable-phone-overlay*
NtpUbuntuwily*
NtpUbuntuxenial*

References

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