CVE-2024-33553
📋 TL;DR
CVE-2024-33553 is an unauthenticated PHP object injection vulnerability in the XStore Core WordPress plugin. Attackers can exploit deserialization of untrusted data to execute arbitrary code on affected WordPress sites. This affects all WordPress installations using XStore Core versions up to 5.3.5.
💻 Affected Systems
- XStore Core WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing remote code execution, data theft, site defacement, and backdoor installation leading to persistent access.
Likely Case
Unauthenticated attackers gain remote code execution capabilities, enabling them to install malware, steal sensitive data, or pivot to other systems.
If Mitigated
With proper web application firewalls and input validation, exploitation attempts are blocked, limiting impact to failed attack attempts.
🎯 Exploit Status
Exploitation requires no authentication and proof-of-concept code is publicly available, making this easily weaponizable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.3.6 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/et-core-plugin/wordpress-xstore-core-plugin-5-3-5-unauthenticated-php-object-injection-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find XStore Core plugin. 4. Click 'Update Now' if update available. 5. If no update appears, manually download version 5.3.6+ from WordPress repository.
🔧 Temporary Workarounds
Disable XStore Core Plugin
linuxTemporarily disable the vulnerable plugin until patching is possible
wp plugin deactivate et-core-plugin
Web Application Firewall Rule
allBlock requests containing serialized PHP object patterns
🧯 If You Can't Patch
- Implement strict input validation to reject serialized data in user inputs
- Deploy a web application firewall with rules to detect and block PHP object injection attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → XStore Core version. If version is 5.3.5 or lower, system is vulnerable.Check Version:
wp plugin get et-core-plugin --field=versionVerify Fix Applied:
Verify XStore Core plugin version is 5.3.6 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WordPress admin-ajax.php or plugin endpoints
- PHP error logs showing unserialize() warnings or errors
- Web server logs with base64 encoded or serialized data in parameters
Network Indicators:
- HTTP requests containing serialized PHP object patterns (O: followed by numbers)
- Requests to XStore Core specific endpoints with unusual parameters
SIEM Query:
source="web_logs" AND (uri_path="*admin-ajax.php*" OR uri_path="*wp-admin*" OR uri_path="*xstore*") AND (query_string="*O:*" OR query_string="*s:*" OR query_string="*a:*" OR query_string="*base64*")🔗 References
- https://patchstack.com/database/vulnerability/et-core-plugin/wordpress-xstore-core-plugin-5-3-5-unauthenticated-php-object-injection-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/et-core-plugin/wordpress-xstore-core-plugin-5-3-5-unauthenticated-php-object-injection-vulnerability?_s_id=cve
