CVE-2020-29592
📋 TL;DR
This vulnerability allows attackers to upload dangerous executable files through Orchard's TinyMCE editor, bypassing file type restrictions. It affects Orchard CMS users before version 1.10, potentially leading to remote code execution or malware deployment.
💻 Affected Systems
- Orchard CMS
📦 What is this software?
Orchard by Orchardproject
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Malware upload leading to backdoor installation, data exfiltration, or lateral movement within the network
If Mitigated
File upload attempts are blocked or logged, with no successful exploitation
🎯 Exploit Status
Simple file upload bypass with publicly available technical details
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.10 and later
Vendor Advisory: https://github.com/OrchardCMS/Orchard/releases
Restart Required: Yes
Instructions:
1. Backup your Orchard installation and database. 2. Download Orchard 1.10 or later from GitHub releases. 3. Replace existing files with patched version. 4. Restart the application/web server. 5. Verify functionality.
🔧 Temporary Workarounds
Disable TinyMCE file upload
allDisable file upload functionality in TinyMCE editor configuration
Edit Orchard configuration to remove file upload capabilities from TinyMCE
Web Application Firewall rules
allBlock file uploads with executable extensions at the WAF level
Configure WAF to block uploads of .exe, .php, .asp, .aspx, .jsp, .jar, and other executable file types
🧯 If You Can't Patch
- Implement strict file upload validation at the application level
- Deploy network segmentation to isolate Orchard servers from critical assets
🔍 How to Verify
Check if Vulnerable:
Check Orchard version in admin panel or web.config file. Versions before 1.10 are vulnerable.Check Version:
Check Admin Dashboard or examine web.config for version informationVerify Fix Applied:
Verify version is 1.10 or later and test file upload functionality with executable files (should be blocked)📡 Detection & Monitoring
Log Indicators:
- File upload attempts with executable extensions
- Unusual file upload activity in TinyMCE logs
- Failed file type validation events
Network Indicators:
- POST requests to file upload endpoints with executable content
- Unusual outbound connections after file uploads
SIEM Query:
source="orchard_logs" AND ("upload" OR "TinyMCE") AND ("exe" OR "php" OR "asp" OR "aspx" OR "jsp")