CVE-2025-29448
📋 TL;DR
An unauthenticated booking logic flaw in Easy!Appointments v1.5.1 allows attackers to create appointments with excessively long durations, blocking all future booking availability and causing denial of service. This affects all systems running the vulnerable version without proper input validation.
💻 Affected Systems
- Easy!Appointments
📦 What is this software?
Easy\!appointments by Easyappointments
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of booking services indefinitely, requiring manual database cleanup and potential business disruption.
Likely Case
Temporary booking system unavailability requiring administrator intervention to remove malicious appointments.
If Mitigated
Limited impact with proper input validation and rate limiting in place.
🎯 Exploit Status
Simple HTTP request manipulation required, no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Monitor official Easy!Appointments repository for patch. 2. Apply patch when available. 3. Test booking functionality after patching.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to limit appointment duration to reasonable maximum values.
Modify booking logic to validate duration parameter before processing
Rate Limiting
allImplement rate limiting on booking endpoints to prevent mass exploitation.
Configure web server or application rate limiting rules
🧯 If You Can't Patch
- Implement web application firewall rules to block requests with excessive duration parameters
- Monitor booking logs for abnormal appointment durations and implement manual review process
🔍 How to Verify
Check if Vulnerable:
Attempt to create appointment with duration parameter set to extremely high value (e.g., 999999). If accepted without validation, system is vulnerable.Check Version:
Check Easy!Appointments configuration file or admin panel for version information.Verify Fix Applied:
Test that appointment creation rejects durations beyond reasonable maximum (e.g., > 24 hours).📡 Detection & Monitoring
Log Indicators:
- Booking requests with abnormally high duration values
- Multiple failed booking attempts with large duration parameters
Network Indicators:
- HTTP POST requests to booking endpoint with large duration parameters
- Unusual spike in booking-related traffic
SIEM Query:
source="web_logs" AND (duration>86400 OR duration="999999") AND uri="/booking"