Description
OpenCATS before 0.10.0 contains a missing authorization vulnerability in CalendarUI::onEditEvent() and onDeleteEvent() that allows authenticated users to modify or delete other users' calendar events. Attackers with EDIT or DELETE access can supply arbitrary eventID values to alter or remove any user's events, including non-public ones restricted to their owner.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| opencats | OpenCATS | < 0.10.0 | 0.10.0 |
References
- https://github.com/opencats/OpenCATS/issues/720 issue-tracking
- https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd patch
- OpenCATS v0.10.0 Release Notes release-notes
- https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L555-L585 technical-description
- https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L690-L712 technical-description
- https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php#L83-L150 technical-description
- VulnCheck Advisory: OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent third-party-advisory