CVE-2020-26252
📋 TL;DR
This vulnerability allows authenticated administrators with product update permissions to upload executable files and execute them via layout XML in OpenMage. It enables remote code execution on affected OpenMage installations. Only OpenMage instances with vulnerable versions and administrators with specific permissions are affected.
💻 Affected Systems
- OpenMage
📦 What is this software?
Openmage by Openmage
Openmage by Openmage
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attacker to execute arbitrary code, steal data, install backdoors, or pivot to other systems.
Likely Case
Attacker gains shell access to the web server, potentially accessing sensitive data and modifying website content.
If Mitigated
Limited impact if proper access controls and file upload restrictions are in place, though risk remains elevated.
🎯 Exploit Status
Exploitation requires authenticated admin access; proof-of-concept code is available in public advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 19.4.10 or 20.0.6 and later
Vendor Advisory: https://github.com/OpenMage/magento-lts/security/advisories/GHSA-99m6-r53j-4hh2
Restart Required: No
Instructions:
1. Backup your OpenMage installation and database. 2. Update to OpenMage version 19.4.10 or 20.0.6 or later. 3. Clear cache and verify functionality.
🔧 Temporary Workarounds
Restrict Administrator Permissions
allTemporarily remove product update permissions from administrators until patching is complete.
File Upload Restrictions
allImplement web application firewall rules to block suspicious file uploads and XML layout modifications.
🧯 If You Can't Patch
- Implement strict access controls and limit administrator permissions to essential functions only.
- Deploy network segmentation and monitoring to detect suspicious file uploads and XML modifications.
🔍 How to Verify
Check if Vulnerable:
Check OpenMage version in admin panel or via composer show openmage/magento-lts.Check Version:
composer show openmage/magento-lts | grep versionVerify Fix Applied:
Confirm version is 19.4.10 or 20.0.6 or later using the same command.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to product directories
- Suspicious XML layout modifications
- Admin account performing unexpected product updates
Network Indicators:
- POST requests with executable file uploads to product endpoints
- XML requests modifying layout configurations
SIEM Query:
source="web_logs" AND (uri_path="/admin/catalog_product/*" AND (file_upload="*.php" OR file_upload="*.exe"))🔗 References
- https://github.com/OpenMage/magento-lts/commit/0786aa48bc7b618cfe37b59f45e1da3714c533c3
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-99m6-r53j-4hh2
- https://github.com/OpenMage/magento-lts/commit/0786aa48bc7b618cfe37b59f45e1da3714c533c3
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-99m6-r53j-4hh2
