Hello,
CloudStack users can add and read comments (annotations) on resources
they are authorised to access.
Due to an access validation issue that affects Apache CloudStack
versions from 4.16.0, users who have access, prior access or knowledge
of resource UUIDs can list and add comments (annotations) to such
resources.
An attacker with a user-account and access or prior knowledge of
resource UUIDs may exploit this issue to read contents of the comments
(annotations) or add malicious comments (annotations) to such resources.
This may cause potential loss of confidentiality of CloudStack
environments and resources if the comments (annotations) contain any
privileged information.
However, guessing or brute-forcing resource UUIDs are generally hard to
impossible and access to listing or adding comments isn't same as access
to CloudStack resources, making this issue of very low severity and
general low impact.
CloudStack admins may also disallow listAnnotations and addAnnotation
API access to non-admin roles in their environment as an interim
measure.
Regards,
Lucian
