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 previous versions 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.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
ntp ntp 4.2.8 |
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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