CVE-2024-4092
📋 TL;DR
The Slider Revolution WordPress plugin has a stored XSS vulnerability in the 'htmltag' parameter that allows authenticated attackers (typically administrators or authors with extended permissions) to inject malicious scripts into web pages. These scripts execute whenever users visit the compromised pages, potentially leading to session hijacking, defacement, or malware distribution. All WordPress sites using Slider Revolution versions up to 6.7.7 are affected.
💻 Affected Systems
- Slider Revolution WordPress Plugin
📦 What is this software?
Slider Revolution by Themepunch
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access, install backdoors, steal sensitive data, or redirect users to malicious sites, potentially compromising the entire WordPress installation and associated systems.
Likely Case
Attackers hijack user sessions, steal cookies/credentials, deface websites, or redirect users to phishing/malware sites, primarily affecting site visitors and users.
If Mitigated
Limited to minor defacement or non-persistent attacks if proper input validation and output escaping are implemented, with minimal impact on core systems.
🎯 Exploit Status
Exploitation requires authenticated access (admin or author with extended permissions). Simple script injection via 'htmltag' parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.7.8 and later
Vendor Advisory: https://www.sliderrevolution.com/documentation/changelog/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Slider Revolution. 4. Click 'Update Now' if available. 5. Alternatively, download version 6.7.8+ from sliderrevolution.com and manually update.
🔧 Temporary Workarounds
Temporary Input Sanitization
allAdd custom input validation for 'htmltag' parameter in theme functions
Add to theme's functions.php: add_filter('revslider_sanitize_htmltag', 'sanitize_text_field');
Restrict User Permissions
allRemove Slider Revolution configuration capabilities from non-admin users
Use WordPress role editor plugins or add: remove_cap('author', 'revslider_edit_slides'); to functions.php
🧯 If You Can't Patch
- Immediately restrict Slider Revolution configuration to administrators only using role management plugins.
- Implement web application firewall (WAF) rules to block suspicious 'htmltag' parameter values and monitor for XSS attempts.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Slider Revolution > Version. If version is 6.7.7 or lower, you are vulnerable.Check Version:
wp plugin list --name='Slider Revolution' --field=version (WP-CLI) or check WordPress admin plugins pageVerify Fix Applied:
After updating, verify version shows 6.7.8 or higher in WordPress plugins list. Test 'htmltag' parameter with basic script payload to confirm sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with 'htmltag' parameter containing script tags
- Multiple failed XSS attempts in web server logs
- Unexpected JavaScript in slider content
Network Indicators:
- Suspicious outbound connections from compromised pages
- Unexpected iframe or script loads in slider content
SIEM Query:
source="web_logs" AND ("htmltag" AND ("script" OR "javascript:" OR "onload=" OR "onerror="))🔗 References
- https://www.sliderrevolution.com/documentation/changelog/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8437abcc-3e34-4a8a-bfe2-2ff7c9f41164?source=cve
- https://www.sliderrevolution.com/documentation/changelog/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8437abcc-3e34-4a8a-bfe2-2ff7c9f41164?source=cve
