CVE-2024-25595
📋 TL;DR
This vulnerability allows attackers to bypass IP-based access restrictions in the WPMU DEV Defender Security WordPress plugin by spoofing authentication. It affects all WordPress sites running Defender Security plugin versions up to and including 4.4.1. Attackers can potentially access restricted functionality or content that should be limited to specific IP addresses.
💻 Affected Systems
- WPMU DEV Defender Security WordPress Plugin
📦 What is this software?
Defender by Wpmudev
⚠️ Risk & Real-World Impact
Worst Case
Complete bypass of IP-based access controls allowing unauthorized access to admin panels, sensitive data, or restricted content, potentially leading to data theft or further system compromise.
Likely Case
Unauthorized access to content or functionality protected by IP restrictions, such as admin areas, staging sites, or geographically restricted content.
If Mitigated
Limited impact if additional authentication layers exist beyond IP restrictions, though the IP control layer is completely bypassed.
🎯 Exploit Status
Authentication bypass vulnerabilities are frequently weaponized. The low complexity suggests attackers can easily develop or adapt exploits once details become public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.2 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/defender-security/wordpress-defender-security-plugin-4-4-1-ip-restriction-bypass-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Defender Security' and click 'Update Now'. 4. Verify version is 4.4.2 or higher.
🔧 Temporary Workarounds
Disable IP Restriction Feature
allTemporarily disable the IP restriction functionality in Defender Security plugin until patched.
Implement Web Application Firewall
allDeploy a WAF with IP restriction rules to provide additional protection layer.
🧯 If You Can't Patch
- Disable the Defender Security plugin entirely and use alternative security solutions
- Implement network-level IP restrictions at firewall or load balancer
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Defender Security → Version. If version is 4.4.1 or lower, you are vulnerable if using IP restrictions.Check Version:
wp plugin list --name=defender-security --field=versionVerify Fix Applied:
After updating, verify version shows 4.4.2 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Failed IP restriction attempts followed by successful access from unexpected IPs
- Multiple access attempts with spoofed headers
Network Indicators:
- HTTP requests with manipulated headers attempting to bypass IP controls
- Unusual traffic patterns to restricted endpoints
SIEM Query:
source="wordpress" AND (event="authentication_failure" OR event="access_granted") AND ip NOT IN allowed_ips🔗 References
- https://patchstack.com/database/vulnerability/defender-security/wordpress-defender-security-plugin-4-4-1-ip-restriction-bypass-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/defender-security/wordpress-defender-security-plugin-4-4-1-ip-restriction-bypass-vulnerability?_s_id=cve
