File access via the TFTP service.
Unauthorized remote access to system or user files.
The TFTP (trivial file transfer protocol) service provides remote access to files, without asking for a password. It is typically used for the initialization of diskless computers, of X terminals, or of other dedicated hardware.
When the TFTP daemon does not limit access to specific files or hosts, a remote intruder can use the service to obtain copies of the password file or of other system or user files, or to remotely overwrite files.