CVE-2024-8420
📋 TL;DR
The DHVC Form WordPress plugin has a privilege escalation vulnerability that allows unauthenticated attackers to register as administrators. This affects all WordPress sites using DHVC Form version 2.4.7 or earlier. Attackers can gain full administrative control of vulnerable WordPress installations.
💻 Affected Systems
- DHVC Form WordPress Plugin
📦 What is this software?
Dhvc Form by Sitesao
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover with attacker gaining administrator privileges, installing backdoors, defacing content, stealing data, and using the site for further attacks.
Likely Case
Attackers create administrator accounts to maintain persistent access, install malware, or use the site for phishing campaigns.
If Mitigated
With proper monitoring and access controls, unauthorized administrator accounts could be detected and removed before significant damage occurs.
🎯 Exploit Status
Simple HTTP POST request manipulation with no authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.8 or later
Vendor Advisory: https://codecanyon.net/item/dhvc-form-wordpress-form-for-visual-composer/8326593
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find DHVC Form and click 'Update Now'. 4. If update not available, download latest version from vendor and upload manually.
🔧 Temporary Workarounds
Disable User Registration
allTemporarily disable WordPress user registration to prevent exploitation
Deactivate Plugin
allDeactivate DHVC Form plugin until patched
🧯 If You Can't Patch
- Implement web application firewall rules to block requests containing 'role' parameter in registration forms
- Monitor user registration logs for suspicious administrator account creation
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for DHVC Form version 2.4.7 or earlierCheck Version:
wp plugin list --name=dhvc-form --field=versionVerify Fix Applied:
Verify DHVC Form plugin version is 2.4.8 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- User registration logs showing administrator role assignment
- New administrator accounts created from unusual IP addresses
Network Indicators:
- HTTP POST requests to registration endpoints with 'role' parameter set to administrator values
SIEM Query:
source="wordpress.log" AND "user_registered" AND "role=administrator"