CVE-2023-38052
📋 TL;DR
This CVE describes a Broken Object Level Authorization (BOLA) vulnerability in Easy!Appointments that allows low-privileged users to access, modify, or delete administrator accounts by manipulating admin ID parameters. This affects all Easy!Appointments installations with user accounts, enabling privilege escalation and unauthorized data manipulation.
💻 Affected Systems
- Easy!Appointments
📦 What is this software?
Easyappointments by Easyappointments
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the appointment system with admin account takeover, data destruction, and potential lateral movement to connected systems.
Likely Case
Unauthorized access to sensitive appointment data, modification of system settings, and disruption of business operations.
If Mitigated
Limited impact with proper authorization checks preventing unauthorized object access despite the vulnerability.
🎯 Exploit Status
Requires authenticated low-privileged user access; exploitation involves simple HTTP request manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Easy!Appointments release
Vendor Advisory: https://github.com/alextselegidis/easyappointments
Restart Required: No
Instructions:
1. Update to latest Easy!Appointments version. 2. Verify authorization checks are implemented for admin endpoints. 3. Test that low-privileged users cannot access admin resources.
🔧 Temporary Workarounds
Implement API Authorization Middleware
allAdd server-side authorization checks to verify user permissions before processing admin endpoint requests.
Implement authorization middleware in your API routes
Restrict Admin Endpoint Access
linuxUse web server configuration to restrict access to /admins/* endpoints to admin users only.
# Apache: <Location "/admins"> Require admin-role </Location>
# Nginx: location /admins { allow admin-ips; deny all; }
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the application from sensitive systems
- Enable detailed logging and monitoring for unauthorized access attempts to admin endpoints
🔍 How to Verify
Check if Vulnerable:
As a low-privileged user, attempt to access GET /admins/{adminId} with another user's admin ID. If successful, system is vulnerable.Check Version:
Check Easy!Appointments version in admin panel or application configuration filesVerify Fix Applied:
Repeat the vulnerable test; requests should return 403 Forbidden or similar authorization error.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to /admins/* endpoints
- 403 Forbidden errors from admin endpoints
- Admin account modifications from non-admin users
Network Indicators:
- HTTP requests to /admins/* from non-admin IPs or user agents
- Unusual pattern of PUT/DELETE requests to admin resources
SIEM Query:
source="web_logs" AND (uri_path="/admins/*" AND (user_role!="admin" OR response_code=403))