Bitwarden Cryptography Vulnerability Analysis Report

This technical report details the findings of an analysis conducted by the Applied Cryptography Group at ETH Zurich, focusing on Bitwarden's core cryptography operations. The analysis was conducted under a malicious server threat model, highlighting vulnerabilities that are relevant when a server deviates from expected behavior. The report lists ten identified issues, with seven addressed through fixes or ongoing remediation efforts. The report outlines the conditions necessary for exploitation and the mitigations implemented, emphasizing the variations in threat profiles for self-hosted versus cloud instances of Bitwarden. Additionally, the document acknowledges contributions from ETH Zurich researchers, expressing gratitude for their assistance in enhancing the security framework of Bitwarden, ensuring improved safety for its users. For transparency, it includes a copy of the report's findings section, providing a complete view of the issues and the steps taken to resolve them.