CVE-2023-2105
📋 TL;DR
This session fixation vulnerability in easyappointments allows attackers to hijack user sessions by fixing session IDs before authentication. It affects all users of easyappointments versions prior to 1.5.0, potentially enabling unauthorized access to appointment management systems.
💻 Affected Systems
- easyappointments
📦 What is this software?
Easyappointments by Easyappointments
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to the appointment system, allowing them to view, modify, or delete all appointments, customer data, and system settings.
Likely Case
Unauthorized access to user accounts leading to data exposure and manipulation of appointment bookings.
If Mitigated
Limited impact with proper session management controls and network segmentation in place.
🎯 Exploit Status
Exploit details are publicly available in the referenced commit and bounty reports. Attackers can fix session IDs before user authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.0
Vendor Advisory: https://github.com/alextselegidis/easyappointments/commit/7f37350fab9d729a9350d96369ff0f453cf7b840
Restart Required: Yes
Instructions:
1. Backup your current installation and database. 2. Download version 1.5.0 from GitHub. 3. Replace all files with the new version. 4. Restart your web server. 5. Verify the fix by checking session behavior.
🔧 Temporary Workarounds
Session Regeneration After Login
allImplement custom session regeneration after successful authentication to prevent session fixation.
Modify authentication logic to call session_regenerate_id(true) after login
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block session fixation attempts
- Enable strict session management controls and monitor for unusual session activity
🔍 How to Verify
Check if Vulnerable:
Check if session ID remains the same before and after authentication. If session ID doesn't change after login, the system is vulnerable.Check Version:
Check the version.php file or admin panel for version numberVerify Fix Applied:
Verify that session IDs are regenerated after successful authentication and that old session IDs become invalid.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with same session ID
- Session IDs that persist across authentication events
- Unusual session creation patterns
Network Indicators:
- HTTP requests with manipulated session cookies
- Session fixation attempts in HTTP headers
SIEM Query:
source="web_logs" AND (session_id="*" AND event="login_success") | stats count by session_id | where count > 1🔗 References
- https://github.com/alextselegidis/easyappointments/commit/7f37350fab9d729a9350d96369ff0f453cf7b840
- https://huntr.dev/bounties/de213e0b-a227-4fc3-bbe7-0b33fbf308e1
- https://github.com/alextselegidis/easyappointments/commit/7f37350fab9d729a9350d96369ff0f453cf7b840
- https://huntr.dev/bounties/de213e0b-a227-4fc3-bbe7-0b33fbf308e1
