When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.
Weakness
The product writes sensitive information to a log file.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Cloud-init | Canonical | * | 21.2 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | cloud-init-0:20.3-10.el8_4.5 | * |
| Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | cloud-init-0:18.5-7.el8_1.6 | * |
| Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | cloud-init-0:18.5-12.el8_2.10 | * |
| Cloud-init | Ubuntu | bionic | * |
| Cloud-init | Ubuntu | esm-infra/bionic | * |
| Cloud-init | Ubuntu | esm-infra/focal | * |
| Cloud-init | Ubuntu | esm-infra/xenial | * |
| Cloud-init | Ubuntu | focal | * |
| Cloud-init | Ubuntu | groovy | * |
| Cloud-init | Ubuntu | trusty | * |
| Cloud-init | Ubuntu | upstream | * |
| Cloud-init | Ubuntu | xenial | * |