CVE-2023-0786
📋 TL;DR
This CVE describes a cross-site scripting (XSS) vulnerability in phpMyFAQ software versions prior to 3.1.11. Attackers can inject malicious scripts into web pages viewed by other users, potentially stealing session cookies or performing actions on behalf of victims. All users running phpMyFAQ versions below 3.1.11 are affected.
💻 Affected Systems
- phpMyFAQ
📦 What is this software?
Phpmyfaq by Phpmyfaq
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain administrative access to the FAQ system, modify content, access user data, or use the compromised system as a foothold for further attacks.
Likely Case
Attackers inject malicious scripts to steal user session cookies, potentially gaining unauthorized access to user accounts and sensitive FAQ data.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts, limiting impact to attempted exploitation attempts.
🎯 Exploit Status
XSS vulnerabilities are commonly weaponized in automated attack tools. The commit shows specific input validation fixes.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.11
Vendor Advisory: https://github.com/thorsten/phpmyfaq/commit/ce676eb9e9d8cb7864f36ee124e838b1ad15415f
Restart Required: No
Instructions:
1. Backup your current phpMyFAQ installation and database. 2. Download phpMyFAQ version 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
Input Validation Web Application Firewall Rule
allImplement WAF rules to block XSS payloads in user inputs
# Example ModSecurity rule: SecRule ARGS "<script" "id:1001,phase:2,deny,status:403,msg:'XSS Attack Detected'"
# Example naxsi rule: MainRule "str:<script" "msg:XSS script tag" "mz:$ARGS_VAR|$BODY_VAR" "s:$XSS:4" id:1001;
Content Security Policy Header
allImplement CSP headers to restrict script execution sources
# Add to web server configuration: Header set Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval';"
# For Apache: Header always set Content-Security-Policy "default-src 'self'"
# For Nginx: add_header Content-Security-Policy "default-src 'self';";
🧯 If You Can't Patch
- Implement strict Content Security Policy headers to prevent script execution from unauthorized sources
- Deploy a web application firewall with XSS detection rules to block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check your phpMyFAQ version by viewing the admin dashboard or checking the version.php file. If version is below 3.1.11, you are vulnerable.Check Version:
grep -i 'version' phpmyfaq/inc/version.php || cat phpmyfaq/admin/index.php | grep -i versionVerify Fix Applied:
After updating, verify the version shows 3.1.11 or higher in the admin interface. Test XSS payloads in user input fields to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing script tags or JavaScript code
- Multiple failed login attempts followed by successful login from different IP
- Administrator sessions from unexpected IP addresses or user agents
Network Indicators:
- HTTP requests containing <script>, javascript:, or eval() in parameters
- Outbound connections to suspicious domains following user input submission
SIEM Query:
source="web_server_logs" AND ("<script" OR "javascript:" OR "onload=" OR "onerror=") AND dest_port=80