Grandstream VoIP products deploy a remote provisioning mechanism that allows to automatically set configuration elements on app startup. By default, an insecure connection to `fm.grandstream.com` is used to obtain the provisioning profile. However, even if an HTTPS URL is configured, the certificate is not validated, allowing an active attacker to successfully impersonate the provisioning server with an invalid, mismatching or outdated certificate.
e07ded7e5b842693413e62a615f10b879e181af670786c29c60e322c6aec3f73The Grandstream VoIP products deploy a remote provisioning mechanism that allows to automatically set configuration elements on phone/app startup. By default, an insecure connection to `fm.grandstream.com` is used to obtain the provisioning profile. An active attacker can redirect this request and change arbitrary values of the configuration. This allows to redirect phone calls through a malicious server, turn the phone into a bug, change passwords, and exfiltrate system logs (including the phone numbers dialed by the user).
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