The fifth and sixth attacks are what the researchers call trusted impersonation and impersonation to confidentiality break. Each builds off the other to enable a server to impersonate users and read their messages. A seventh attack works against a backup feature and is only of theoretical interest because the researchers can’t instantiate an attack exploiting it against a real Matrix server.
By confusing the legitimate implementation bugs which only affect matrix-js-sdk and derivatives with these lower severity protocol design considerations, the researchers have artificially inflated the overall severity of the problem, by falsely implying that the protocol itself is vulnerable. Besides disagreeing on some of the specific vulnerabilities, the researchers and Hodgson remain at odds on another point. The researchers said the vulnerabilities they uncovered “highlight a lack of a unified and formal approach to security guarantees in Matrix” and that the specification has grown “organically with new sub-protocols adding new functionalities and thus inadvertently subverting the security guarantees of the core protocol.
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