NTP BUG 2918: Potential path traversal vulnerability in the config file saving of ntpd on VMS
Last update: June 28, 2022 20:06 UTC (57417e17c)
ntpd is configured to allow remote configuration, and if the (possibly spoofed) IP address is allowed to send remote configuration requests, and if the attacker knows the remote configuration password or if
ntpd was configured to disable authentication, then an attacker can send a set of packets to
ntpd that may cause
ntpd to overwrite files.
- Implement BCP-38.
- Upgrade to 4.2.8p4 or later.
- If you are unable to upgrade, remote configuration of NTF’s
- an explicitly configured “trusted” key. Only configure this if you need it.
- access from permitted IP addresses. You choose the IPs.
- authentication. Don’t disable it. Practice key security safety.
- If you use
ntpq in scripts, make sure
ntpq does what you expect in your scripts.
This weakness was discovered by Yves Younan of Cisco Talos.