CVE-2023-33561
📋 TL;DR
CVE-2023-33561 is an improper input validation vulnerability in PHP Jabbers Time Slots Booking Calendar v3.3 that allows attackers to set insecure passwords due to weak validation. This affects all users running the vulnerable version of this PHP-based booking calendar software.
💻 Affected Systems
- PHP Jabbers Time Slots Booking Calendar
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could compromise user accounts by setting weak or predictable passwords, potentially leading to unauthorized access, data theft, or manipulation of booking data.
Likely Case
Attackers exploit weak password validation to gain unauthorized access to user accounts, compromising booking data and potentially accessing sensitive information.
If Mitigated
With proper input validation and strong password policies, the risk is limited to potential brute force attacks against weak passwords.
🎯 Exploit Status
Exploitation requires access to password setting functionality, which may require some level of access or social engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.4 or later
Vendor Advisory: https://www.phpjabbers.com/time-slots-booking-calendar/
Restart Required: No
Instructions:
1. Download latest version from PHP Jabbers website. 2. Backup current installation. 3. Replace vulnerable files with patched version. 4. Test functionality.
🔧 Temporary Workarounds
Implement Strong Password Policy
allAdd server-side password validation to enforce strong passwords
Add password validation in PHP code: if(strlen($password) < 12 || !preg_match('/[A-Z]/', $password) || !preg_match('/[a-z]/', $password) || !preg_match('/[0-9]/', $password) || !preg_match('/[^A-Za-z0-9]/', $password)) { die('Password too weak'); }
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block weak password submissions
- Enable multi-factor authentication for all user accounts
🔍 How to Verify
Check if Vulnerable:
Check version number in admin panel or by examining PHP files for version 3.3 referencesCheck Version:
Check admin panel or grep for version in PHP files: grep -r '3.3' /path/to/installation/Verify Fix Applied:
Test password validation by attempting to set weak passwords and verifying they are rejected📡 Detection & Monitoring
Log Indicators:
- Multiple failed password change attempts
- Successful password changes with weak passwords
Network Indicators:
- HTTP POST requests to password change endpoints with weak password values
SIEM Query:
source="web_logs" AND (url="*password*" OR url="*change*password*") AND (password="*123*" OR password="*password*" OR password="*qwerty*")