CVE-2023-4279
📋 TL;DR
The User Activity Log WordPress plugin before version 1.6.7 insecurely retrieves client IP addresses from HTTP headers that can be manipulated by attackers. This allows malicious actors to spoof their IP addresses to hide the source of attacks or bypass IP-based restrictions. WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- User Activity Log WordPress Plugin
📦 What is this software?
User Activity Log by Solwininfotech
⚠️ Risk & Real-World Impact
Worst Case
Attackers completely hide their origin while conducting malicious activities like brute force attacks, content scraping, or reconnaissance, making attribution and blocking impossible.
Likely Case
Attackers spoof IP addresses to bypass IP-based rate limiting, access controls, or geographic restrictions, enabling continued malicious activity.
If Mitigated
With proper logging and monitoring of multiple authentication factors, spoofed IPs might be detected through behavioral anomalies despite the header manipulation.
🎯 Exploit Status
Exploitation requires only HTTP header manipulation, which is trivial with standard tools like curl or proxies.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.7
Vendor Advisory: https://wpscan.com/vulnerability/2bd2579e-b383-4d12-b207-6fc32cfb82bc
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'User Activity Log' plugin. 4. Click 'Update Now' if update is available. 5. Alternatively, download version 1.6.7+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Vulnerable Plugin
allTemporarily deactivate the User Activity Log plugin until patched.
wp plugin deactivate user-activity-log
Implement Web Application Firewall
allConfigure WAF to validate and sanitize X-Forwarded-For and similar headers.
🧯 If You Can't Patch
- Implement network-level IP filtering and monitoring instead of relying on plugin logs.
- Use alternative user activity monitoring plugins that properly validate client IP addresses.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for User Activity Log version. If version is below 1.6.7, system is vulnerable.Check Version:
wp plugin get user-activity-log --field=versionVerify Fix Applied:
Confirm plugin version is 1.6.7 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Multiple user activities from same user showing rapidly changing IP addresses
- IP addresses in logs that don't match network traffic source IPs
Network Indicators:
- HTTP requests with manipulated X-Forwarded-For, X-Real-IP, or Client-IP headers
- Discrepancy between TCP source IP and logged IP in application
SIEM Query:
source="wordpress.log" "User Activity Log" | regex "IP\s*:\s*[^\s]+" | stats count by ip | where count>threshold