UDP Port 67 – DHCP Server (Dynamic Host Configuration Protocol)
About UDP Port 67
The Internet Assigned Numbers Authority (IANA) registers port 67 for bootps. The IANA description reads: ‘Bootstrap Protocol Server’. This port appears in 8 IDS rules and does not have notable malware activity indicators in our data.
IDS Rule References
8 IDS / security rules reference UDP port 67. Treat that number as context, not a danger score. Many detection rules are written against groups of ports rather than one service, web ports especially, so common web alternate ports inherit large counts while genuinely sensitive services can show few rules or none. Presence in IDS rules does not mean traffic on this port is malicious.
Rule categories (top 4): attempted-admin (3), attempted-user (2), misc-activity (2), misc-attack (1).
Sample rule descriptions for UDP port 67:
- SERVER-OTHER bootp hardware address length overflow
- SERVER-OTHER bootp invalid hardware type
- SERVER-OTHER bootp hostname format string attempt
- OS-OTHER Malicious DHCP server bash environment variable injection attempt
- OS-LINUX Red Hat NetworkManager DHCP client command injection attempt
Data Sources
This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry, Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range), and Snort Community Rules (GPLv2).