CVE-2024-13824
📋 TL;DR
CVE-2024-13824 is a PHP object injection vulnerability in the CiyaShop WordPress theme that allows unauthenticated attackers to inject malicious PHP objects via deserialization of untrusted input. The vulnerability only becomes dangerous when combined with a POP chain from another plugin or theme, which could enable remote code execution, file deletion, or data theft. All WordPress sites using CiyaShop theme versions up to 4.19.0 are affected.
💻 Affected Systems
- CiyaShop - Multipurpose WooCommerce Theme for WordPress
📦 What is this software?
Ciyashop by Potenzaglobalsolutions
⚠️ Risk & Real-World Impact
Worst Case
If combined with a suitable POP chain from another plugin/theme, attackers could achieve remote code execution, delete arbitrary files, or exfiltrate sensitive data, potentially leading to complete site compromise.
Likely Case
Most installations will see no immediate impact unless they have vulnerable plugins/themes with POP chains installed, but the vulnerability creates a dangerous attack surface that could be exploited later.
If Mitigated
With proper input validation and secure deserialization practices, the vulnerability would be prevented entirely, but the theme's current implementation lacks these controls.
🎯 Exploit Status
Exploitation requires finding or creating a suitable POP chain from other installed components. The vulnerability itself is straightforward to trigger.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.19.0
Vendor Advisory: https://themeforest.net/item/ciyashop-responsive-multipurpose-woocommerce-wordpress-theme/22055376#item-description__changelog
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Appearance > Themes. 3. Check for CiyaShop theme updates. 4. Update to version newer than 4.19.0. 5. Clear any caching plugins.
🔧 Temporary Workarounds
Disable vulnerable functions
allRemove or disable the 'add_ciyashop_wishlist' and 'ciyashop_get_compare' functions from the theme files
# Edit theme PHP files to comment out or remove vulnerable function calls
Input validation WAF rule
linuxImplement web application firewall rules to block deserialization attempts in POST requests
# Example ModSecurity rule: SecRule ARGS "@rx (O:\d+:\"[^\"]+\":\d+:\{[^}]+\})" "id:1001,phase:2,deny,msg:'PHP Object Injection Attempt'
🧯 If You Can't Patch
- Remove the CiyaShop theme entirely and replace with a secure alternative
- Implement strict input validation and sanitization at the application level to prevent deserialization of user-controlled data
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Appearance > Themes for CiyaShop theme version. If version is 4.19.0 or lower, the site is vulnerable.Check Version:
# In WordPress root directory: grep -r "Version:" wp-content/themes/ciyashop/style.cssVerify Fix Applied:
After updating, verify the theme version is higher than 4.19.0 in WordPress admin panel > Appearance > Themes.📡 Detection & Monitoring
Log Indicators:
- POST requests to WordPress endpoints with serialized PHP objects in parameters
- Unusual activity in 'add_ciyashop_wishlist' or 'ciyashop_get_compare' functions
Network Indicators:
- HTTP POST requests containing serialized PHP object patterns (O: followed by numbers and braces)
SIEM Query:
source="web_logs" AND (uri_path="*add_ciyashop_wishlist*" OR uri_path="*ciyashop_get_compare*") AND http_method="POST" AND (request_body MATCHES "O:\\d+:\\\"[^\\\"]+\\\":\\d+:\\{[^}]+\\}")