The Epson "EasyMP" software is designed to remotely stream a users computer to supporting projectors.These devices are authenticated using a unique 4-digit code, displayed on-screen - ensuring only those who can view it are streaming.In addition to the password, each projector has a hardcoded "backdoor" code (2270), which authenticates to all devices.
The product contains hard-coded credentials, such as a password or cryptographic key.
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https://rhinosecuritylabs.com/research/epson-easymp-remote-projection-vulnerabilities/ | third party advisory technical description |