CVE-2016-1548

2017-01-0621:59:00

Debian Security Bug Tracker

security-tracker.debian.org

7.2 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

6.4 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:P/A:P

0.006 Low

EPSS

Percentile

78.7%

JSON

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.

OSVersionArchitecturePackageVersionFilename
Debian11allntp< 1:4.2.8p7+dfsg-1ntp_1:4.2.8p7+dfsg-1_all.deb
Debian10allntp< 1:4.2.8p7+dfsg-1ntp_1:4.2.8p7+dfsg-1_all.deb