CVE-2024-6392
📋 TL;DR
The Sirv WordPress plugin has a missing capability check vulnerability that allows authenticated users with Subscriber-level access or higher to modify plugin settings. Attackers can change the connected Sirv account to one they control, potentially hijacking image optimization services. This affects all WordPress sites using Sirv plugin versions up to 7.2.7.
💻 Affected Systems
- Image Optimizer, Resizer and CDN – Sirv WordPress plugin
📦 What is this software?
Sirv by Sirv
⚠️ Risk & Real-World Impact
Worst Case
Attackers redirect all image optimization traffic through their controlled Sirv account, enabling image manipulation, content injection, or service disruption while potentially incurring costs to the legitimate site owner.
Likely Case
Attackers change the Sirv account to their own, gaining control over image optimization and potentially injecting malicious content into images served through the CDN.
If Mitigated
With proper user role management and monitoring, impact is limited to potential service disruption if detected quickly.
🎯 Exploit Status
Exploitation requires authenticated access but only needs Subscriber-level permissions, which are commonly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.8
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3157544/sirv
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Image Optimizer, Resizer and CDN – Sirv'. 4. Click 'Update Now' if available, or manually update to version 7.2.8+. 5. Verify the plugin is active and functioning.
🔧 Temporary Workarounds
Temporary plugin deactivation
allDisable the Sirv plugin until patched to prevent exploitation
wp plugin deactivate sirv
User role restriction
allTemporarily restrict Subscriber role access or remove unnecessary Subscriber accounts
🧯 If You Can't Patch
- Disable the Sirv plugin entirely and use alternative image optimization solutions
- Implement strict user role management and audit all accounts with Subscriber access or higher
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins → Sirv plugin version. If version is 7.2.7 or lower, you are vulnerable.Check Version:
wp plugin get sirv --field=versionVerify Fix Applied:
After updating, confirm the plugin version shows 7.2.8 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST requests to Sirv plugin endpoints from Subscriber-level users
- Changes to Sirv account settings in WordPress logs
Network Indicators:
- Unexpected API calls to Sirv service from your WordPress instance
- Changes in image CDN endpoints
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" AND parameters CONTAINS "sirv" AND user_role="subscriber")🔗 References
- https://plugins.trac.wordpress.org/browser/sirv/tags/7.2.6/sirv.php#L5197
- https://plugins.trac.wordpress.org/browser/sirv/tags/7.2.6/sirv.php#L5338
- https://www.wordfence.com/threat-intel/vulnerabilities/id/229490c3-d820-4831-b105-a429512c2c60?source=cve
- https://plugins.trac.wordpress.org/browser/sirv/tags/7.2.6/sirv.php#L5197
- https://plugins.trac.wordpress.org/browser/sirv/tags/7.2.6/sirv.php#L5338
- https://www.wordfence.com/threat-intel/vulnerabilities/id/229490c3-d820-4831-b105-a429512c2c60?source=cve
