Modicon PLC IO Scan Status SNMP Request Scan Status Remote Disclosure
Medium Nessus Plugin ID 23824
SynopsisIt is possible to obtain the scan status of a Modicon PLC using an SNMP Get Request.
DescriptionThe Modicon Quantum, Premium and Momentum brands of PLC's have a private SNMP MIB that is available on the Internet. The scan status has been obtained via an SNMP Get Request. The scan status is either idle, operational or stopped.
An attacker may use this information to determine the status of a PLC.
SolutionChange default community strings to a value not easily guessed and filter access to the SNMP port.