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by kbwt 2586 days ago
The application is using a proprietary client/server protocol, so it already lacks lacks any kind of interoperability.

In this specific case, it's unclear whether the bug has direct security implications. The broken SHA-1 is used on some user-controlled data that gets XORed onto the server's decryption of a user-specified payload before being passed into an RC4 key schedule. It's certainly plausible that this might produce a server-assisted privacy compromise of other users' sessions.