![]() ![]() Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.ICS‑CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. Until this software can be updated in the vulnerable devices, Schneider Electric recommends a defense-in-depth strategy, which includes locating the PLCs and devices running the vulnerable software behind firewalls configured to limit access to authorized personnel and protocols. For customers concerned about the Modbus Serial Driver used for those applications, please contact Schneider Electric Technical Support at: Schneider Electric has no immediate plan for updating the other identified software products. For other products listed, the updated ModbusDriverSuite will be implemented with each new version of those software products. OFS V3.5 and Unity Pro V8 have been released including the updated ModbusDriverSuite. Schneider Electric recommends that products that use this driver be updated with the latest version of software. Schneider Electric has released a security notification with further information on this vulnerability and how to mitigate it: DIFFICULTYĪn attacker with a high skill would be able to exploit this vulnerability. No known public exploits specifically target this vulnerability. This vulnerability can be remotely exploited. A CVSS v2 base score of 9.3 has been assigned the CVSS vector string is (AV:N/AC:M/Au:N/C:C/I:C/A:C).CVSS Calculator,, web site last accessed March 27, 2014. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. If a large buffer size is specified in this header, a stack-based buffer overflow results.Ī second overflow problem can then be exploited by overwriting the return address, allowing the attacker to execute arbitrary code with the permission of the user running the software.ĬVE-2013-0662NVD,, NIST uses this advisory to create the CVE web site report. When a connection is made, the Modbus Application Header is first read into a buffer. The Modbus Serial Driver creates a listener on Port 27700/TCP. STACK-BASED BUFFER OVERFLOWCWE-121: Stack-based Buffer Overflow,, web site last accessed March 27, 2014. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW Schneider Electric estimates that these products are used primarily in China, United States, and Europe. ![]() According to Schneider Electric, the affected software is deployed across several sectors including Chemical, Critical Manufacturing, Dams, Energy, Food and Agriculture, Government Facilities, Nuclear Reactors, Materials, and Waste, and Transportation Systems. These applications rely on a common driver to communicate with PLCs. The affected products are mostly software-based utilities and engineering tools designed for programming and configuring process, machine, and general control applications. Schneider Electric corporate headquarters is located in Paris, France, and maintains offices in more than 100 countries worldwide. NCCIC/ICS CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. Impact to individual organizations depends on many factors that are unique to each organization. Modbus Serial Driver versions that are affected:Ī successful exploit of this vulnerability could cause a buffer overflow that could allow arbitrary code execution with user privileges. OPC Factory Server Versions 3.50 and earlier.SFT2841 Versions 14, 13.1 and earlier, and.ModbusCommDTM sl Versions 2.1.2 and earlier,.TwidoSuite Versions 2.31.04 and earlier,.The following Schneider Electric products bundle the Schneider Electric Modbus Serial Driver (ModbusDrv.exe), which is started when attempting to connect to a Programmable Logic Controller (PLC) via the serial port of a personal computer: This vulnerability can be exploited remotely. Schneider Electric has produced patches that mitigate this vulnerability. Carsten Eiram of Risk-Based Security has identified a stack-based buffer overflow vulnerability in Schneider Electric’s Serial Modbus Driver that affects 11 Schneider Electric products. ![]()
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