CVE-2024-3729
📋 TL;DR
This vulnerability in the Frontend Admin WordPress plugin allows unauthenticated attackers to manipulate form processing functions when the server lacks the OpenSSL PHP extension. Attackers can create/edit administrator accounts for privilege escalation, bypass authentication, or inject malicious scripts. All WordPress sites using this plugin up to version 3.19.4 are affected if their PHP configuration doesn't include OpenSSL.
💻 Affected Systems
- Frontend Admin by DynamiApps WordPress plugin
📦 What is this software?
Frontend Admin by Dynamiapps
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover through administrator account creation, followed by arbitrary code execution and data exfiltration.
Likely Case
Unauthenticated attackers create administrator accounts to gain full control of vulnerable WordPress sites.
If Mitigated
No impact if OpenSSL extension is enabled or plugin is patched/disabled.
🎯 Exploit Status
Exploitation requires understanding of WordPress form processing and the specific vulnerable function, but tools likely exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.19.5 and later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3073379/acf-frontend-form-element
Restart Required: No
Instructions:
1. Update Frontend Admin plugin to version 3.19.5 or later via WordPress admin dashboard. 2. Verify update completed successfully. 3. Test critical forms to ensure functionality.
🔧 Temporary Workarounds
Enable PHP OpenSSL Extension
allEnsure OpenSSL extension is loaded in PHP configuration to prevent exploitation.
Check php.ini for 'extension=openssl' line
Restart web server after enabling
Disable Vulnerable Plugin
linuxTemporarily disable Frontend Admin plugin until patched.
wp plugin deactivate acf-frontend-form-element
🧯 If You Can't Patch
- Ensure PHP OpenSSL extension is enabled on all servers
- Implement web application firewall rules to block suspicious form submissions
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin plugins page for Frontend Admin version ≤3.19.4 AND verify PHP OpenSSL extension is disabled via phpinfo() or 'php -m | grep openssl'.Check Version:
wp plugin get acf-frontend-form-element --field=versionVerify Fix Applied:
Confirm plugin version is ≥3.19.5 in WordPress admin and test that critical forms still function properly.📡 Detection & Monitoring
Log Indicators:
- Unusual administrator account creation
- Multiple failed login attempts followed by successful login from new admin
- Suspicious POST requests to WordPress admin-ajax.php with fea_encrypt parameters
Network Indicators:
- HTTP requests manipulating user registration or login forms without authentication
SIEM Query:
source="wordpress.log" AND ("admin_user_added" OR "fea_encrypt")🔗 References
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.18.15/main/helpers.php#L617
- https://plugins.trac.wordpress.org/changeset/3073379/acf-frontend-form-element#file4
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a2d22c5d-5ef5-4920-a1b5-e8284394c7e8?source=cve
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.18.15/main/helpers.php#L617
- https://plugins.trac.wordpress.org/changeset/3073379/acf-frontend-form-element#file4
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a2d22c5d-5ef5-4920-a1b5-e8284394c7e8?source=cve
