Easy!Appointments through 1.6.0 contains an authorization bypass vulnerability in Booking::register() that allows unauthenticated attackers to modify any appointment by supplying an appointment id without its hash. Attackers can enumerate sequential appointment ids with a self-asserted manage_mode flag to rewrite appointment details, rebind them to attacker-controlled customers, and obtain management hashes for rescheduling or cancellation.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/alextselegidis/easyappointments
disclosure@vulncheck.com
https://github.com/alextselegidis/easyappointments/blob/4bc7ecd51f3dade8e041558…
disclosure@vulncheck.com
https://github.com/alextselegidis/easyappointments/commit/09c6fb30b6aac0830a820…
disclosure@vulncheck.com
https://hackmd.io/@haind/easyappointments-booking-register-appointment-takeover
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/easy-appointments-through-1.6.0-authorizat…
disclosure@vulncheck.com