CVE-2025-52023
📋 TL;DR
This vulnerability in gemscms.aptsys.com.sg's PHP backend allows unauthenticated remote attackers to trigger detailed error messages that disclose internal file paths, code snippets, and stack traces. This information exposure can aid attackers in reconnaissance and further exploitation. All systems running gemscms.aptsys.com.sg through 2025-05-28 are affected.
💻 Affected Systems
- gemscms.aptsys.com.sg
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers use disclosed information to map the application structure, identify other vulnerabilities, and potentially achieve remote code execution or data exfiltration.
Likely Case
Attackers gather reconnaissance data about the application's internal structure, file paths, and code logic to plan targeted attacks.
If Mitigated
Limited information disclosure that doesn't lead to further compromise if proper input validation and error handling are implemented.
🎯 Exploit Status
Exploitation requires sending specially crafted HTTP requests to trigger error conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://aptsys.com
Restart Required: No
Instructions:
1. Check vendor website for updates. 2. Apply any available patches. 3. Verify error handling is properly configured.
🔧 Temporary Workarounds
Disable Detailed Error Reporting
allConfigure PHP to suppress detailed error messages in production environments.
php.ini: display_errors = Off
php.ini: log_errors = On
php.ini: error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
Implement Custom Error Handler
allCreate a custom error handler that returns generic error messages.
set_error_handler(function($errno, $errstr, $errfile, $errline) { error_log('Error: ' . $errstr); return 'An error occurred'; });
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block requests triggering error messages.
- Restrict access to API endpoints using IP whitelisting or authentication.
🔍 How to Verify
Check if Vulnerable:
Send malformed HTTP requests to public API endpoints and check if detailed error messages are returned.Check Version:
Check application version in admin panel or configuration files.Verify Fix Applied:
Test with same malformed requests and verify only generic error messages are returned.📡 Detection & Monitoring
Log Indicators:
- Unusual error log entries with stack traces
- Multiple failed API requests from single IPs
Network Indicators:
- HTTP requests with malformed parameters to API endpoints
- Responses containing file paths or code snippets
SIEM Query:
source='web_logs' AND (message LIKE '%stack trace%' OR message LIKE '%/var/www/%' OR message LIKE '%PHP Notice%')