UDP_xdmcp info query

 

Code: p519

Severity: Warning

 

Description: This event is generated when a remote user attempts to query the X Display Manager Control Protocol (XDMCP).

Impact: Reconnaissance. An attacker may obtain a list of usernames on the remote host.

Corrective: Block inbound XDMCP traffic. Disable XDMCP as a listening service on the remote host unless it is required.