Improper authorization in some Zoom clients may allow an authorized user to conduct an escalation of privilege via network access.
Weakness
The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Meetings | Zoom | * | 5.16.0 (excluding) |
| Rooms | Zoom | * | 5.16.0 (excluding) |
| Virtual_desktop_infrastructure | Zoom | * | 5.14.13 (excluding) |
| Virtual_desktop_infrastructure | Zoom | 5.15.0 (including) | 5.15.11 (excluding) |
| Zoom | Zoom | * | 5.16.0 (excluding) |
Potential Mitigations
- Utilize a user prompt pop-up to authorize potentially harmful actions such as those modifying data or dealing with sensitive information.
- When designing functionality of actions in the URL scheme, consider whether the action should be accessible to all mobile applications, or if an allowlist of applications to interface with is appropriate.