Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Prior to version 19.7.0, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the matrix-js-sdk implementing a too permissive key forwarding strategy on the receiving end. Starting with version 19.7.0, the default policy for accepting key forwards has been made more strict in the matrix-js-sdk. matrix-js-sdk will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately, for example, by showing a warning for such messages. This attack requires coordination between a malicious homeserver and an attacker, and those who trust your homeservers do not need a workaround.
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Topics Security Off-Prem On-Prem Software Offbeat Vendor Voice Vendor Voice Resources You take the green pill, you'll spend six hours in a 'don't roll your own crypto' debate
Four security researchers have identified five cryptographic vulnerabilities in code libraries that can be exploited to undermine Matrix encrypted chat clients. This includes impersonating users and sending messages as them. The researchers – Martin Albrecht (University of London), Sofía Celi (Brave Software), Benjamin Dowling (University of Sheffield) and Daniel Jones (University of London) – described their findings in a pre-print paper titled "Practically-exploitable Cryptographic Vulner...
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