Delta Plc The Password Function Is Ineffective -
[1] Delta Electronics, DVP-PLC User Manual (Programming) , 2019. [2] K. Stouffer, et al., Guide to Industrial Control Systems (ICS) Security , NIST SP 800-82 Rev. 2. [3] J. M. Moura, “Reverse Engineering Delta PLC Communication Protocol,” DEFCON 27 ICS Village , 2019. [4] IEC 62443-4-2: Security for IACS components.
As industrial control systems (ICS) adopt greater connectivity, the security of programmable logic controllers (PLCs) becomes paramount. Delta Electronics PLCs, widely used in automation, offer a built-in password protection function intended to prevent unauthorized access to logic and configuration. This paper critically evaluates the effectiveness of this function. Through a combination of vendor documentation analysis, reverse engineering of communication protocols (specifically Delta’s proprietary RS-485/Modbus variants and Ethernet commands), and practical attack modeling, we demonstrate that the password mechanism is fundamentally ineffective. It provides only a false sense of security, vulnerable to both trivial interception attacks and offline brute-force/cryptanalysis. We conclude that the function serves as an access hurdle rather than a true security boundary, recommending its deprecation in favor of modern, standards-based authentication. delta plc the password function is ineffective
We set up a test environment: a Delta DVP-14SS2 PLC (RS-232/RS-485) and a Delta AS228T (Ethernet). A password was set using ISPSoft. [1] Delta Electronics, DVP-PLC User Manual (Programming) ,
The password protection feature on Delta PLCs (e.g., DVP, AS, and AH series) is marketed as a means to "protect intellectual property" and "prevent unauthorized program modifications." Typically, a user sets an 8-character (or less) alphanumeric password via the ISPSoft or WPLSoft programming software. However, unlike IT systems, PLC password mechanisms are often implemented at the application layer of a proprietary or semi-standard industrial protocol, not as part of a robust security architecture. This paper investigates why this function fails against a motivated adversary. unlike IT systems
[1] Delta Electronics, DVP-PLC User Manual (Programming) , 2019. [2] K. Stouffer, et al., Guide to Industrial Control Systems (ICS) Security , NIST SP 800-82 Rev. 2. [3] J. M. Moura, “Reverse Engineering Delta PLC Communication Protocol,” DEFCON 27 ICS Village , 2019. [4] IEC 62443-4-2: Security for IACS components.
As industrial control systems (ICS) adopt greater connectivity, the security of programmable logic controllers (PLCs) becomes paramount. Delta Electronics PLCs, widely used in automation, offer a built-in password protection function intended to prevent unauthorized access to logic and configuration. This paper critically evaluates the effectiveness of this function. Through a combination of vendor documentation analysis, reverse engineering of communication protocols (specifically Delta’s proprietary RS-485/Modbus variants and Ethernet commands), and practical attack modeling, we demonstrate that the password mechanism is fundamentally ineffective. It provides only a false sense of security, vulnerable to both trivial interception attacks and offline brute-force/cryptanalysis. We conclude that the function serves as an access hurdle rather than a true security boundary, recommending its deprecation in favor of modern, standards-based authentication.
We set up a test environment: a Delta DVP-14SS2 PLC (RS-232/RS-485) and a Delta AS228T (Ethernet). A password was set using ISPSoft.
The password protection feature on Delta PLCs (e.g., DVP, AS, and AH series) is marketed as a means to "protect intellectual property" and "prevent unauthorized program modifications." Typically, a user sets an 8-character (or less) alphanumeric password via the ISPSoft or WPLSoft programming software. However, unlike IT systems, PLC password mechanisms are often implemented at the application layer of a proprietary or semi-standard industrial protocol, not as part of a robust security architecture. This paper investigates why this function fails against a motivated adversary.