Nozomi Networks Discovers Vulnerability in Siemens Building Automation Software

Recently, we had the opportunity to do a security analysis of the Siemens PXC4.E16, a Building Automation System (BAS) of the Desigo/APOGEE family for HVAC and building service plants. In this blog, we are publishing the details of a vulnerability that was caused by an improper implementation of the password-based key derivation mechanism for user accounts. It could also have been abused to perform a Denial-of-Service (DoS) attack against the controller.

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