Docker before 1.3.1 and docker-py before 0.5.3 fall back to HTTP when the HTTPS connection to the registry fails, which allows man-in-the-middle attackers to conduct downgrade attacks and obtain authentication and image data by leveraging a network position between the client and the registry to block HTTPS traffic.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Docker | Docker | * | 1.3.0 (including) |
| Docker-py | Docker | * | 0.5.3 (including) |
| Docker.io | Ubuntu | trusty | * |
| Docker.io | Ubuntu | upstream | * |
| Docker.io | Ubuntu | utopic | * |