Psono Security Vulnerability Assessment Report

This document is a final report detailing the findings of a security vulnerability assessment conducted by X41 D-Sec GmbH on the Psono solution, an end-to-end encrypted password manager. The assessment was performed through a combination of source code review and dynamic testing, focusing on identifying security vulnerabilities, particularly in the cryptographic implementation. The review, conducted between June 17 and July 8, 2024, resulted in the discovery of four vulnerabilities, categorized by severity as one high and three medium, with no critical or low vulnerabilities identified. The report outlines the methodology used, including adherence to established standards for penetration testing and source code review. It also discusses the scope of the review, covering both backend and client implementations, and provides recommendations for further testing, particularly on client-side implementations. The findings indicate that while vulnerabilities were present, the overall security level of the Psono solution is considered good compared to similar systems.