CVE-2020-23754
📋 TL;DR
This is a Cross-Site Scripting (XSS) vulnerability in PHP-Fusion's poll administration feature that allows attackers to inject malicious scripts into web pages. Attackers can execute arbitrary code in victims' browsers when they view compromised poll pages. This affects PHP-Fusion 9.03.50 installations with the polls feature enabled.
💻 Affected Systems
- PHP-Fusion
📦 What is this software?
Phpfusion by Php Fusion
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, perform actions as administrators, deface websites, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies or credentials, potentially gaining administrative access to the PHP-Fusion installation.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be rendered harmless as text rather than executable code.
🎯 Exploit Status
Exploitation requires access to poll administration features. The GitHub issue shows proof-of-concept screenshots demonstrating the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.03.51 or later
Vendor Advisory: https://github.com/php-fusion/PHP-Fusion/issues/2315
Restart Required: No
Instructions:
1. Upgrade PHP-Fusion to version 9.03.51 or later. 2. Apply the specific patch for poll_admin.php that adds proper input validation and output encoding. 3. Clear any cached content.
🔧 Temporary Workarounds
Disable Polls Feature
allTemporarily disable the polls feature to prevent exploitation while planning upgrade.
# Disable via admin panel or remove/rename infusions/member_poll_panel/ directory
Input Validation Filter
allAdd custom input validation to sanitize poll-related inputs before processing.
# Add htmlspecialchars() or similar filtering to poll input handling
🧯 If You Can't Patch
- Implement a Web Application Firewall (WAF) with XSS protection rules
- Restrict access to poll administration features to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check if running PHP-Fusion 9.03.50 and examine poll_admin.php for missing input sanitization in poll parameter handling.Check Version:
Check includes/version.php or admin panel for version informationVerify Fix Applied:
Verify PHP-Fusion version is 9.03.51+ and check that poll_admin.php includes proper htmlspecialchars() or equivalent output encoding.📡 Detection & Monitoring
Log Indicators:
- Unusual poll creation/modification activity
- Suspicious JavaScript in poll-related POST requests
- Multiple failed poll administration attempts
Network Indicators:
- Malicious script injection in poll-related HTTP requests
- Unexpected redirects from poll pages
SIEM Query:
web_requests WHERE (uri CONTAINS 'poll_admin.php' OR uri CONTAINS 'member_poll_panel') AND (body CONTAINS '<script>' OR body CONTAINS 'javascript:')🔗 References
- https://github.com/php-fusion/PHP-Fusion/issues/2315
- https://user-images.githubusercontent.com/62001260/81574006-6fb70480-93cf-11ea-814c-55a96d2fe95e.PNG
- https://user-images.githubusercontent.com/62001260/81574112-9412e100-93cf-11ea-9493-615a70162034.PNG
- https://github.com/php-fusion/PHP-Fusion/issues/2315
- https://user-images.githubusercontent.com/62001260/81574006-6fb70480-93cf-11ea-814c-55a96d2fe95e.PNG
- https://user-images.githubusercontent.com/62001260/81574112-9412e100-93cf-11ea-9493-615a70162034.PNG
