On 07 Jul 2016, at 19:37, Daniel Pocock daniel@pocock.pro wrote:
Every vendor of deskphones has their own provisioning system, they are all quite different. Some are quite effective, e.g. the way Polycom puts certificates in every phone to avoid the risk of exposing credentials during provisioning or subsequent updates.
Polycom’s system was broken because there was no secure way to validate their root ca. It was only available from a non-TLS site and wasn’t referred to in any printed documentation, not on promotional USB sticks or anything…
Good idea, poor implementation. If they made it available on a web site with HTTPS it would have been much easier to trust the CA.
/O