Port 1900 · SSDP / UPnP

Port 1900 is SSDP / UPnP, UDP.

Simple Service Discovery Protocol — UPnP device discovery. Can be abused for DDoS reflection amplification attacks.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service udp-1900 protocol udp port 1900

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ssdp service udp-1900 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -ulnp | grep :1900
• nmap nmap -sU -p 1900 <host>

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• 3702 WS-Discovery
• 5353 mDNS
• 19 Chargen
• 11211 Memcached

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