Artemis: Defanging Software Supply Chain Attacks in Multi-repository Update Systems
Marina Moore, Trishank Karthik Kuppusamy, Justin Cappos · Annual Computer Security Applications Conference · 2023
Modern software installation tools often use packages from more than one repository, presenting a unique set of security challenges. Such a configuration increases the risk of repository compromise and introduces attacks like dependency confusion and repository fallback. In this paper, we offer the first exploration of attacks that specifically target multiple repository update systems, and propose a unique defensive strategy we call articulated trust. Articulated trust is a principle that allows software installation tools to specify trusted developers and repositories for each package. To implement articulated trust, we built Artemis, a framework that introduces several new security techniques, such as per-package prioritization of repositories, multi-role delegations, multiple-repository consensus, and key pinning. These techniques allow for a greater diversity of trust relationships while eliminating the security risk of single points of failure.