RealVNC 4.1.1, and other products that use RealVNC such as AdderLink IP and Cisco CallManager, allows remote attackers to bypass authentication via a request in which the client specifies an insecure security type such as Type 1 - None, which is accepted even if it is not offered by the server, as originally demonstrated using a long password.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Realvnc | Vnc | 4.1.1 (including) | 4.1.1 (including) |
| Vnc4 | Ubuntu | dapper | * |
| Vnc4 | Ubuntu | devel | * |
| Vnc4 | Ubuntu | edgy | * |
| Vnc4 | Ubuntu | feisty | * |