The messages exchanged with the Modbus protocol contain the address of the data to be processed. Each type of data (bit or register) has a 16-bit address. MasterPact MTZ, MasterPact NT/NW, ComPact NS, and ComPact NSX circuit breakers support registers only.Įach register has a register number. The Modbus protocol uses 2 types of data: O Maximum value is around 700 ms, so it is recommended to implement a 1 second time out after sending a Modbus request. O Typical value < 10 ms for 90% of the exchanges The slave processes the request then replies to the master. In unicast mode, the master addresses a slave using the specific address of the slave. The Modbus protocol can exchange information using 2 communication modes: O The slaves cannot initiate communication, either to the master or to other slaves. O The slaves can only send replies to the master. O The master can address each slave individually using its specific address or all slaves simultaneously using address 0. O Only the master can initiate communication and send requests to the slaves. O Only 1 master is connected to the network at a time. The master-slave principle is characterized as follows: In a standard Modbus network, there is 1 master and up to 31 slaves.Ī detailed description of the Modbus protocol is available at Characteristics of the Master-Slave Principle The master-slave principle is a model for a communication protocol in which one device (the master) controls one or more other devices (the slaves). No known public exploits specifically target this vulnerability.The Modbus protocol exchanges information using a request-reply mechanism between a master (client) and a slave (server). Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.Īdditional mitigation guidance and recommended practices are publicly available on the ICS webpage at /ics in the technical information paper, ICS-TIP-12-146-01B-Targeted Cyber Intrusion Detection and Mitigation Strategies. Also recognize VPN is only as secure as its connected devices.ĬISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.ĬISA also provides a section for control systems security recommended practices on the ICS webpage at /ics. When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available.Locate control system networks and remote devices behind firewalls and isolate them from business networks.Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet.Rockwell Automation’s general security guidelines can be found in the Recommended Security Guidelines.įor more information, see Rockwell Automation’s security advisory.ĬISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. This issue has been mitigated in the following AOI versions: 2.04.00 and later. Rockwell Automation users of these affected products are encouraged to evaluate the following mitigations and apply them appropriately. Researchers at Veermata Jijabai Technological Institute reported this vulnerability to Rockwell Automation. COMPANY HEADQUARTERS LOCATION: United States.CRITICAL INFRASTRUCTURE SECTORS: Multiple.A CVSS v3 base score of 5.3 has been calculated the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N). If exploited, an unauthorized user could read the connected device’s Modbus TCP Server AOI information.ĬVE-2023-0027 has been assigned to this vulnerability. Versions of Rockwell Automation Modbus TCP Server AOI prior to 2.04.00 are vulnerable to an unauthorized user sending a malformed message that could cause the controller to respond with a copy of the most recent response to the last valid request. Modbus TCP Server AOI: Versions 2.00 and 2.03ģ.2.1 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200.The following versions of Rockwell Automation Modbus TCP Server AOI, are affected: Successful exploitation of this vulnerability could allow an unauthorized user to read the connected device’s Modbus TCP Server AOI information. Vulnerability: Exposure of Sensitive Information to an Unauthorized Actor.Equipment: Modbus TCP Server Add-On Instruction (AOI).ATTENTION: Exploitable remotely/low attack complexity.
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