NTP BUG 2946: Origin Leak: ntpq and ntpdc Disclose Origin Timestamp to Unauthenticated Clients
Last update: June 28, 2022 20:06 UTC (57417e17c)
To prevent off-path attackers from impersonating legitimate peers, clients require that the origin timestamp in a received response packet match the transmit timestamp from its last request to a given peer. Under assumption that only the recipient of the request packet will know the value of the transmit timestamp, this prevents an attacker from forging replies.
ntpd to get time from multiple sources.
restrict statements to limit who is allowed to issue
ntpdc queries. Note that
ntpdc queries are disabled by default.
- Monitor your
This weakness was discovered by Matthew Van Gundy of Cisco ASIG.