CVE-2016-1548

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 legitimat...

CVE-2016-1547

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if...

PT-2016-4858

Name of the Vulnerable Software and Affected Versions NTP versions 4.2.8p3 and earlier NTPsec version a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and earlier Description The issue arises because ntpd relies on the underlying operating system to protect it from requests that impersonate reference...

Network Time Protocol Ephemeral Association Time Spoofing Vulnerability

SUMMARY ntpd is vulnerable to Sybil attacks. A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win ntpd’s clock selection algorithm and modify a victim’s clock. TESTED VERSIONS NTP 4.2.8p3 NTP 4.2.8p4 NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 NTPs...

Network Time Protocol Crypto-NAK Preemptible Association Denial of Service Vulnerability

SUMMARY An off-path attacker can cause a preemptible client association to be demobilized by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled. Furthermore, if the attacker keeps sending cryp...

Network Time Protocol (NTP) / NTPd / NTPsec Detection (UDP)

UDP based detection of services supporting the Network Time Protocol NTP. In addition to the protocol itself the existence of the ntpd NTPd / NTPsec daemon is detected as well. SPDX-FileCopyrightText: 2005 David Lodge SPDX-FileCopyrightText: New / improved code and detection since 2009 Greenbone ...