With Librem 5 kill switches gaining popularity amongst highly privacy focused users, I have became aware of existence of baseband firmware inside cell modems. In theory what level of access a three letter agency can have to a device via possible baseband modem backdoors, not Librem 5 specifically?
Can a backdoored modem baseband firmware enable remote access to:
- Mobile Phone Microphone
- Mobile OS RAM to access decrypted private keys
- View what is on screen
Thanks very much