CVE-2024-4920
📋 TL;DR
This critical vulnerability in SourceCodester Online Discussion Forum Site 1.0 allows attackers to upload arbitrary files without restrictions via the registerH.php file's 'ima' parameter. Remote attackers can exploit this to upload malicious files like web shells, potentially gaining full control of affected systems. Anyone running this specific forum software version is affected.
💻 Affected Systems
- SourceCodester Online Discussion Forum Site
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via web shell upload leading to data theft, ransomware deployment, or use as attack infrastructure
Likely Case
Web shell installation enabling persistent backdoor access, data exfiltration, and lateral movement within the network
If Mitigated
File upload attempts blocked or detected before execution, limiting impact to failed attack attempts
🎯 Exploit Status
Exploit details publicly disclosed; simple file upload manipulation makes weaponization straightforward
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found
Restart Required: No
Instructions:
No official patch available. Consider removing or replacing the software entirely.
🔧 Temporary Workarounds
File Upload Restriction
allImplement strict file upload validation in registerH.php to only allow specific file types and sizes
Modify registerH.php to add: $allowed_types = ['image/jpeg', 'image/png']; $max_size = 5000000;
File Extension Validation
allAdd server-side file extension validation and rename uploaded files
Add to registerH.php: $extension = pathinfo($_FILES['ima']['name'], PATHINFO_EXTENSION); if(!in_array($extension, ['jpg','png'])) { die('Invalid file type'); }
🧯 If You Can't Patch
- Remove or disable registerH.php file entirely
- Implement WAF rules to block file uploads to registerH.php with suspicious extensions
🔍 How to Verify
Check if Vulnerable:
Check if registerH.php exists in the web root and test file upload functionality with non-image filesCheck Version:
Check software documentation or admin panel for version informationVerify Fix Applied:
Attempt to upload a PHP file via registerH.php; successful upload indicates still vulnerable📡 Detection & Monitoring
Log Indicators:
- Multiple file upload attempts to registerH.php
- Uploads of files with .php, .exe, or other executable extensions
- Large file uploads to registerH.php
Network Indicators:
- POST requests to registerH.php with file upload content
- Unusual outbound connections from web server after file upload
SIEM Query:
source="web_logs" AND uri="/registerH.php" AND method="POST" AND (file_extension="php" OR file_extension="exe" OR file_extension="sh")