Description
cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. Fixed in snapd version 2.45.2, revision 8539 and core version 2.45.2, revision 9659.
CVSS breakdown
CVSS 3.1
Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Affected products
- Canonical / core2.45.2 – 2.45.2, revision 9659
- Canonical / snapd2.45.2 – 2.45.2, revision 8539
References
- MISChttps://launchpad.net/bugs/1879530
- VENDOR_ADVISORYhttps://ubuntu.com/USN-4424-1