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 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 (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 ...