CVE-2023-47508
📋 TL;DR
Unauthenticated Reflected Cross-Site Scripting (XSS) vulnerability in the Averta Master Slider Pro WordPress plugin allows attackers to inject malicious scripts via crafted URLs. When users click malicious links, attackers can steal session cookies, redirect users, or perform actions on their behalf. This affects WordPress sites using Master Slider Pro version 3.6.5 and earlier.
💻 Affected Systems
- Averta Master Slider Pro WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full control of WordPress site, install backdoors, deface site, or steal sensitive data.
Likely Case
Attackers steal user session cookies, redirect users to phishing sites, or perform limited actions as authenticated users.
If Mitigated
With proper Content Security Policy (CSP) headers and input validation, impact is limited to script execution in user's browser only.
🎯 Exploit Status
Reflected XSS vulnerabilities are trivial to exploit with simple crafted URLs. Public proof-of-concept exists in vulnerability databases.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.6.6 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/masterslider/wordpress-master-slider-pro-plugin-3-6-5-reflected-cross-site-scripting-xss-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Master Slider Pro. 4. Click 'Update Now' if update available. 5. Alternatively, download latest version from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable Master Slider Pro plugin until patched
wp plugin deactivate masterslider
Web Application Firewall (WAF) Rules
allBlock XSS payloads at network perimeter
Add WAF rule: Block requests containing <script> tags in URL parameters
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution
- Use web application firewall to filter malicious input and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Master Slider Pro versionCheck Version:
wp plugin list --name=masterslider --field=versionVerify Fix Applied:
Verify plugin version is 3.6.6 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- URLs containing suspicious script tags or JavaScript in query parameters
- Multiple 404 errors with script-like parameters
Network Indicators:
- HTTP requests with <script> tags in URL parameters
- Unusual redirects from Master Slider pages
SIEM Query:
source="web_server" AND (url="*<script>*" OR url="*javascript:*") AND url="*/wp-content/plugins/masterslider/*"🔗 References
- https://patchstack.com/database/vulnerability/masterslider/wordpress-master-slider-pro-plugin-3-6-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/masterslider/wordpress-master-slider-pro-plugin-3-6-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
