CVE-2023-0790
📋 TL;DR
CVE-2023-0790 is an uncaught exception vulnerability in phpMyFAQ that can lead to denial of service or information disclosure. Attackers can trigger unhandled exceptions to crash the application or expose sensitive error details. All users running phpMyFAQ versions prior to 3.1.11 are affected.
💻 Affected Systems
- phpMyFAQ
📦 What is this software?
Phpmyfaq by Phpmyfaq
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially exposing sensitive debugging information or stack traces that could aid further attacks.
Likely Case
Partial service disruption with error messages revealing internal application details that could be used for reconnaissance.
If Mitigated
Graceful error handling with generic error messages and continued service availability.
🎯 Exploit Status
The vulnerability involves triggering unhandled exceptions which typically requires minimal technical skill. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.11
Vendor Advisory: https://github.com/thorsten/phpmyfaq/commit/f34d84dfe551ecdd675916e45cc0606e04a0734e
Restart Required: No
Instructions:
1. Backup your current phpMyFAQ installation and database. 2. Download phpMyFAQ 3.1.11 or later from the official repository. 3. Replace the existing files with the patched version. 4. Verify the installation is working correctly.
🔧 Temporary Workarounds
Enable Production 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
Web Application Firewall Rules
allImplement WAF rules to block requests that trigger unusual error patterns
🧯 If You Can't Patch
- Implement rate limiting to prevent mass triggering of exceptions
- Deploy a reverse proxy with request filtering to block malicious input patterns
🔍 How to Verify
Check if Vulnerable:
Check the phpMyFAQ version in the admin panel or by examining the version.php file in the installation directory.Check Version:
grep -r 'PMF_VERSION' /path/to/phpmyfaq/version.phpVerify Fix Applied:
Verify the version is 3.1.11 or higher and test error handling by triggering controlled exceptions.📡 Detection & Monitoring
Log Indicators:
- Unusual frequency of PHP fatal errors
- Stack traces in error logs
- Repeated application crashes
Network Indicators:
- Increased HTTP 500 error responses
- Abnormal request patterns targeting error-prone endpoints
SIEM Query:
source="php_error.log" AND ("Fatal error" OR "Uncaught Exception") | stats count by src_ip