The Update Framework

Article summary

The Update Framework (TUF) is a software framework designed to protect mechanisms that automatically identify and download updates to software. TUF uses a series of roles and keys to provide a means to retain security, even when some keys or servers are compromised. It does this with a stated goal of requiring minimal changes and effort from repository administrators, software developers, and end users. In this way, it protects software repositories, which are an increasingly desirable target for hackers. A software update, sometimes referred to as a patch, can add functionalities and address flaws in existing code. Unfortunately, in delivering updates to neutralize flaws, these systems can unintentionally introduce vulnerabilities that, in turn, can be exploited by attackers. The design of TUF acknowledges that all software repositories will likely be compromised at some point, so any security strategy must be prepared for that scenario. TUF-enabled systems focus on limiting the impact of attacks and providing a mechanism for recovery. This strategy of “compromise-resilience” improves on existing methods based on keysigning by incorporating techniques, such as separation of signing duties and setting a threshold number of required signatures. Dividing the responsibility for authenticating a file or image ensures no single hacker can compromise the system.…

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