The ANTlabs InnGate firmware on IG 3100, IG 3101, InnGate 3.00 E, InnGate 3.01 E, InnGate 3.02 E, InnGate 3.10 E, InnGate 3.01 G, and InnGate 3.10 G devices does not require authentication for rsync sessions, which allows remote attackers to read or write to arbitrary files via TCP traffic on port 873.