XSS pattern for attack modeling in testing

Security issues of web applications are still a current topic of interest especially when considering the consequences of unintended behaviour. Such services might handle sensitive data about several thousands or millions of users. Hence, exploiting services or other undesired effects that cause harm on users has to be avoided. Therefore, for software developers of such applications one of the major tasks in providing security is to embed testing methodologies into the software development cycle, thus minimizing the subsequent damage resulting in debugging and time intensive upgrading. Model-based testing evolved as one of the methodologies which offer several theoretical and practical approaches in testing the system under test (SUT) that combine several input generation strategies like mutation testing, using of concrete and symbolic execution etc. by putting the emphasis on specification of the model of an application. In this work we propose an approach that makes use of an attack pattern model in form of a UML state machine for test case generation and execution. The paper also discusses the current implementation of our attack pattern testing tool using a XSS attack pattern and demonstrates the execution in a case study.