An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and previous versions 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 authentication is enabled.
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ntp ntp |
What's the time? It's time to get ill. Unless you fix these beastly flaws
Cisco has turned over a bunch of Network Time Protocol daemon (ntpd) vulnerabilities to the Linux Foundation's Core Infrastructure Initiative. The vulnerabilities, discovered during its ongoing ntpd evaluation, “allow attackers to craft UDP packets to either cause a denial of service condition or to prevent the correct time being set”, Cisco's Talos Security Intelligence and Research Group writes here. First on the list is CVE-2016-1550, described as an NTP authentication potential timing vu...
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