CVE-2025-4556: Okcat Parking Management Platform RCE

CVE-2025-4556 Overview

The web management interface of Okcat Parking Management Platform from ZONG YU contains a critical Arbitrary File Upload vulnerability (CWE-434). This security flaw allows unauthenticated remote attackers to upload and execute web shell backdoors on the server, ultimately enabling arbitrary code execution. The vulnerability requires no authentication and can be exploited remotely over the network, making it a severe threat to any exposed instances of this parking management system.

Critical Impact

Unauthenticated attackers can upload malicious web shells to gain full remote code execution capabilities on vulnerable servers, potentially compromising the entire parking management infrastructure and connected systems.

Affected Products

• Okcat Parking Management Platform (ZONG YU)

Discovery Timeline

• May 12, 2025 - CVE-2025-4556 published to NVD
• May 12, 2025 - Last updated in NVD database

Technical Details for CVE-2025-4556

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), a well-known weakness category that occurs when applications allow users to upload files without properly validating the file type, content, or destination. In the context of the Okcat Parking Management Platform, the web management interface fails to implement adequate file upload restrictions, creating a direct pathway for attackers to compromise the server.

The attack can be executed remotely over the network with no authentication required and no user interaction necessary. This combination of factors makes the vulnerability particularly dangerous, as attackers can fully automate exploitation against internet-exposed instances. Successful exploitation grants attackers the ability to execute arbitrary code with the privileges of the web server process, potentially leading to complete system compromise, data theft, lateral movement within the network, or use of the compromised server for further attacks.

Root Cause

The root cause of this vulnerability is insufficient input validation and file type verification in the file upload functionality of the Okcat Parking Management Platform's web management interface. The application fails to properly:

• Validate file extensions against an allowlist of safe file types
• Verify the actual content and MIME type of uploaded files
• Restrict the upload destination directory to prevent execution of uploaded files
• Implement authentication controls on the file upload endpoint

This allows attackers to upload executable web shells (such as PHP, JSP, or ASP files depending on the server configuration) that can then be accessed and executed directly through the web server.

Attack Vector

The attack is network-based and can be executed by any unauthenticated remote attacker who can reach the web management interface. The typical attack flow involves:

1. Identifying an exposed Okcat Parking Management Platform instance
2. Locating the vulnerable file upload endpoint in the web management interface
3. Crafting a malicious web shell payload (e.g., a PHP backdoor)
4. Uploading the web shell through the unprotected file upload functionality
5. Accessing the uploaded web shell via its URL on the web server
6. Executing arbitrary commands on the server through the web shell interface

The vulnerability allows for direct code execution without requiring any privilege escalation, as the malicious file is immediately accessible and executable once uploaded.

Detection Methods for CVE-2025-4556

Indicators of Compromise

• Unexpected files with executable extensions (.php, .jsp, .asp, .aspx) appearing in web-accessible upload directories
• Web server access logs showing requests to unusual file paths in upload directories
• Outbound network connections from the web server to unknown external IP addresses
• Unusual process spawning from the web server process (e.g., cmd.exe, /bin/sh, or powershell.exe)
• File system modifications or new files created outside normal application behavior

Detection Strategies

• Monitor file system integrity in web-accessible directories for newly created executable files
• Implement web application firewall (WAF) rules to detect and block web shell upload attempts
• Analyze web server logs for suspicious POST requests to upload endpoints followed by GET requests to the same paths
• Deploy endpoint detection and response (EDR) solutions to identify post-exploitation activities such as command execution from web server processes

Monitoring Recommendations

• Enable detailed logging on the Okcat Parking Management Platform and forward logs to a SIEM for correlation
• Set up alerts for file creation events in web server document root and upload directories
• Monitor network traffic from web servers for command-and-control communication patterns
• Implement file integrity monitoring (FIM) on critical web application directories

How to Mitigate CVE-2025-4556

Immediate Actions Required

• Restrict network access to the Okcat Parking Management Platform web interface using firewall rules to allow only trusted IP addresses
• Audit the file system for any existing web shells or unauthorized files in upload directories
• Implement authentication on all administrative endpoints if not already in place
• Consider temporarily disabling the file upload functionality until a patch is available
• Isolate affected systems from critical network segments

Patch Information

Refer to the vendor ZONG YU for official patch availability. Additional information may be available through the TW-CERT Security Advisory and the TW-CERT Incident Notification.

Workarounds

• Implement strict file extension allowlisting on upload endpoints at the web server or reverse proxy level
• Configure the web server to prevent execution of scripts in upload directories (e.g., disable PHP/script execution in specific folders)
• Deploy a web application firewall (WAF) with rules to block common web shell patterns and file upload attacks
• Require strong authentication for all access to the web management interface
• Use network segmentation to limit the blast radius if compromise occurs

# Example: Apache configuration to disable PHP execution in uploads directory
<Directory "/var/www/html/uploads">
    php_admin_flag engine off
    <FilesMatch "\.(php|phtml|php3|php4|php5|pl|py|jsp|asp|aspx|cgi|sh)$">
        Require all denied
    </FilesMatch>
</Directory>