CVE-2021-29654
📋 TL;DR
CVE-2021-29654 is a deserialization vulnerability in AjaxSearchPro's administration panel import database feature that allows remote code execution. Attackers can exploit this to execute arbitrary code on affected systems. This affects administrators with access to the vulnerable administration panel.
💻 Affected Systems
- AjaxSearchPro WordPress plugin
📦 What is this software?
Ajaxsearchpro by Stackpath
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the web server, potentially leading to data theft, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to web shell deployment, data exfiltration, and further exploitation of the hosting environment.
If Mitigated
Limited impact if proper network segmentation and least privilege access controls prevent lateral movement from the compromised web application.
🎯 Exploit Status
Exploitation requires administrator credentials to access the vulnerable import feature. Public proof-of-concept code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.20.8 and later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/2509114/ajax-search-pro
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find AjaxSearchPro. 4. Click 'Update Now' to update to version 4.20.8 or later. 5. Verify update completed successfully.
🔧 Temporary Workarounds
Disable Import Feature
allRemove or restrict access to the vulnerable import database functionality
# Modify plugin code to disable import feature or remove import functionality
Restrict Admin Access
allLimit access to WordPress admin panel to trusted IP addresses only
# Add to .htaccess for Apache:
Order deny,allow
Deny from all
Allow from 192.168.1.0/24
# Add to nginx config:
location /wp-admin {
allow 192.168.1.0/24;
deny all;
}
🧯 If You Can't Patch
- Remove AjaxSearchPro plugin entirely if not essential
- Implement strict network segmentation and firewall rules to isolate the WordPress installation
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > AjaxSearchPro version. If version is below 4.20.8, system is vulnerable.Check Version:
# WordPress CLI: wp plugin list --name=ajax-search-pro --field=version
# Or check wp-content/plugins/ajax-search-pro/readme.txt for versionVerify Fix Applied:
Verify AjaxSearchPro version is 4.20.8 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with import-related parameters
- Unexpected file uploads or creation in wp-content/uploads
- Suspicious process execution from web server user
Network Indicators:
- Unusual outbound connections from web server to external IPs
- Data exfiltration patterns from WordPress directories
SIEM Query:
source="wordpress.log" AND ("ajax-search-pro" OR "importDatabase") AND status=200