Nowadays, almost all electronic devices include a communication interface
that allows to interact with them, exchange data, or operate their services
remotely. The trend toward increased interconnectivity simultaneously increases
the vulnerability of these systems. Due to the high costs associated with
comprehensive security analysis, many manufacturers neglect the safety aspect
of a product in order to avoid costs. However, the importance of secure IT
systems is growing, as the security of a system can also influence
safety-critical aspects. Standard security analysis approaches are nowadays
still mainly based on time-intensive and error-prone manual activities. In this
paper, we present the formal concepts of the automatic threat and vulnerability
analysis tool ThreatGet. Therefore, we introduce the concept of the Extended
Data-Flow Diagram that is used to represent the system under investigation in
an abstracted form, and we highlight the formal analysis language of the tool.
This domain-specific language is used to formulate so-called anti-patterns.
These anti-patterns that can be interpreted by the tool for an automatic
security analysis of the system. Besides the language declaration, we present
the entire semantic evaluation of the language during the analysis. Parts of
the definitions and elaborations of the diagram model and the analysis language
were developed in the context of the master thesis of Korbinian Christl, in
cooperation with the University of Vienna.

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