CVE-2023-51336
📋 TL;DR
CVE-2023-51336 is a CSV injection vulnerability in PHPJabbers Meeting Room Booking System v1.0 that allows attackers to execute remote code by injecting malicious formulas into CSV exports. This affects organizations using the vulnerable version of this booking system software. Attackers can exploit insufficient input validation in the Languages section's Labels parameters to achieve code execution.
💻 Affected Systems
- PHPJabbers Meeting Room Booking System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution leading to data theft, ransomware deployment, or complete system takeover.
Likely Case
Data exfiltration, privilege escalation, or installation of backdoors through successful code execution.
If Mitigated
Limited impact with proper input validation and output encoding preventing formula injection.
🎯 Exploit Status
Exploit requires user interaction with CSV file but technical details are publicly available in Packet Storm references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.1 or later
Vendor Advisory: https://www.phpjabbers.com/meeting-room-booking-system/
Restart Required: No
Instructions:
1. Download latest version from PHPJabbers website. 2. Backup current installation. 3. Replace vulnerable files with patched version. 4. Test functionality.
🔧 Temporary Workarounds
Input Validation Sanitization
allImplement strict input validation and output encoding for CSV export functionality
Modify PHP code to sanitize user input in /controllers/SystemOptionsController.php and related CSV generation files
🧯 If You Can't Patch
- Disable CSV export functionality in System Options if not required
- Implement web application firewall rules to block CSV injection patterns
🔍 How to Verify
Check if Vulnerable:
Check if running PHPJabbers Meeting Room Booking System v1.0 by examining version in admin panel or source code.Check Version:
Check admin panel or examine /includes/version.php file for version information.Verify Fix Applied:
Test CSV export functionality with malicious formula inputs (e.g., =cmd|' /C calc'!A0) to ensure proper sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual CSV export requests
- Malicious formula patterns in input parameters
- Unexpected system command execution
Network Indicators:
- CSV file downloads containing formula patterns
- Outbound connections from web server to unexpected destinations
SIEM Query:
source="web_logs" AND (uri="/index.php?controller=SystemOptions" OR filetype="csv") AND (pattern="=cmd|" OR pattern="=HYPERLINK" OR pattern="=EXEC")