DISV: Domain Independent Semantic Validation of Data Files

Data format specification languages such as PDF or HTML have been used extensively for exchanging structured data over the internet. While receivers of data files (e.g., PDF viewers or web browsers) perform syntax validation of files, validating deep semantic properties has not been systematically explored in practice. However, data files that violate semantic properties may cause unintended effects on receivers, such as causing them to crash or creating security breaches, as recent attacks showed. We present our tool DISV (Domain Independent Semantic Validator). It includes a declarative specification language for users to specify semantic properties of a data format. It also includes a validator that takes a data file together with a property specification and checks if the file follows the specification. We demonstrate a rich variety of properties that can be verified by our tool using eight case studies over three data formats. We also demonstrate that our tool can be used to detect advanced attacks on PDF documents.