The pyGrub boot loader in Xen 3.0.3, 3.3.0, and Xen-3.3.1 does not support the password option in grub.conf for para-virtualized guests, which allows attackers with access to the para-virtualized guest console to boot the guest or modify the guests kernel boot parameters without providing the expected password.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 3.0.3 (including) | 3.0.3 (including) |
| Xen | Xen | 3.3.0 (including) | 3.3.0 (including) |
| Xen | Xen | 3.3.1 (including) | 3.3.1 (including) |