CVE-2020-20471
📋 TL;DR
CVE-2020-20471 is an unauthorized access vulnerability in White Shark System (WSS) 1.3.2 that allows remote attackers to escalate privileges to admin level. This affects all deployments of WSS 1.3.2 with the default_user_edit.php file accessible. Attackers can gain administrative control without authentication.
💻 Affected Systems
- White Shark System (WSS)
📦 What is this software?
White Shark Systems by White Shark Systems Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative access, allowing data theft, system modification, and further exploitation of the network.
Likely Case
Attackers gain admin privileges, modify user accounts, access sensitive data, and potentially install backdoors.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to the vulnerable endpoint.
🎯 Exploit Status
Public exploit code is available on GitHub. Exploitation requires simple HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Remove vulnerable file
allDelete or rename the default_user_edit.php file to prevent exploitation
rm /path/to/wss/default_user_edit.php
mv /path/to/wss/default_user_edit.php /path/to/wss/default_user_edit.php.bak
Restrict access via web server
allConfigure web server to block access to default_user_edit.php
# Apache: Add to .htaccess
<Files "default_user_edit.php">
Order Allow,Deny
Deny from all
</Files>
# Nginx: Add to server block
location ~ /default_user_edit\.php$ {
deny all;
return 403;
}
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the WSS interface
- Monitor access logs for any requests to default_user_edit.php and alert on such activity
🔍 How to Verify
Check if Vulnerable:
Check if default_user_edit.php exists in your WSS installation directory and is accessible via HTTPCheck Version:
Check WSS version in admin panel or look for version files in installation directoryVerify Fix Applied:
Attempt to access default_user_edit.php via browser or curl and verify it returns 403/404 or is inaccessible📡 Detection & Monitoring
Log Indicators:
- HTTP requests to default_user_edit.php
- Unusual admin privilege changes
- Multiple failed login attempts followed by successful admin access
Network Indicators:
- HTTP POST requests to default_user_edit.php with privilege escalation parameters
- Unusual traffic patterns to WSS admin interfaces
SIEM Query:
source="web_server_logs" AND (url="*default_user_edit.php*" OR (event="privilege_escalation" AND app="White Shark System"))