An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1. By writing a malicious QCOW header to a root or ephemeral disk and then triggering a resize, a user may convince Novas Flat image backend to call qemu-img without a format restriction, resulting in an unsafe image resize operation that could destroy data on the host system. Only compute nodes using the Flat image backend (usually configured with use_cow_images=False) are affected.
Weakness
The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nova | Ubuntu | devel | * |
| Nova | Ubuntu | jammy | * |
| Nova | Ubuntu | noble | * |
| Nova | Ubuntu | questing | * |