The secrets of Schneider Electric’s UMAS protocol

UMAS Unified Messaging Application Services is a proprietary Schneider Electric SE protocol used to configure and monitor Schneider Electric PLCs. Schneider Electric controllers that use UMAS include Modicon M580 CPU part numbers BMEP and BMEH and Modicon M340 CPU part numbers BMXP34. Controllers...

Schneider Electric Modicon M580 UMAS function code 0x6d multiple denial-of-service vulnerabilities

Summary Multiple denial-of-service vulnerabilities exist in the UMAS protocol functionality of the Schneider Electric Modicon M580 Programmable Automation Controller, firmware version SV2.70. Specially crafted UMAS commands can cause the device to enter a non-recoverable fault state, resulting in...

Schneider Electric Modicon M221 Network Protocol Interception

The vulnerability of the microprogramming software of Schneider Electric’s Modicon M221 programmable logic controller is related to the incorrect implementation of the network module in the UMAS protocol. Exploiting this vulnerability allows a malicious actor to intercept the controller’s network...