CVE-2021-24696
📋 TL;DR
The Simple Download Monitor WordPress plugin before version 3.9.9 lacks proper nonce validation, enabling Cross-Site Request Forgery (CSRF) attacks. Attackers can trick authenticated administrators into performing unauthorized actions like exporting logs (potentially exposing sensitive data), deleting logs, or removing download thumbnails. This affects all WordPress sites using vulnerable versions of the plugin.
💻 Affected Systems
- Simple Download Monitor WordPress Plugin
📦 What is this software?
Simple Download Monitor by Tipsandtricks Hq
⚠️ Risk & Real-World Impact
Worst Case
An attacker could combine CSRF with the log disclosure vulnerability (fixed in 3.9.6) to steal sensitive site data, delete audit trails to cover tracks, and disrupt site functionality by removing download thumbnails.
Likely Case
Attackers trick administrators into deleting download logs or removing thumbnails, causing data loss and site disruption without immediate detection.
If Mitigated
With proper CSRF protections and updated plugins, no impact occurs as requests would be rejected without valid nonces.
🎯 Exploit Status
Exploitation requires social engineering to target authenticated admin users, but CSRF attacks are well-understood and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.9.9
Vendor Advisory: https://wpscan.com/vulnerability/e94772af-39ac-4743-a556-52351ebda9fe
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Simple Download Monitor'. 4. Click 'Update Now' if available, or manually update to version 3.9.9 or later. 5. Verify update completes successfully.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate the Simple Download Monitor plugin until patched.
wp plugin deactivate simple-download-monitor
Implement CSRF Protection
allAdd custom nonce validation to plugin functions if unable to update immediately.
Requires custom PHP code modification - not recommended for non-developers
🧯 If You Can't Patch
- Restrict admin access to trusted networks only
- Implement strict Content Security Policy (CSP) headers to limit cross-origin requests
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Simple Download Monitor > Version. If version is below 3.9.9, system is vulnerable.Check Version:
wp plugin get simple-download-monitor --field=versionVerify Fix Applied:
Confirm plugin version is 3.9.9 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unexpected log export/download requests
- Log deletion events without admin action
- Thumbnail removal actions from unexpected sources
Network Indicators:
- POST requests to /wp-admin/admin.php?page=sdm-logs with missing or invalid nonce parameters
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin.php" AND uri_query="page=sdm-logs") AND http_method="POST" AND NOT nonce=*