CVE-2024-22567
📋 TL;DR
This vulnerability allows unauthenticated attackers to upload arbitrary files to MCMS 5.3.5 systems via a crafted POST request to /ms/file/upload.do. Attackers can potentially upload malicious files like webshells to gain remote code execution. All systems running MCMS 5.3.5 with the vulnerable endpoint accessible are affected.
💻 Affected Systems
- MCMS
📦 What is this software?
Mcms by Mingsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via webshell upload leading to remote code execution, data exfiltration, and lateral movement within the network.
Likely Case
Attackers upload webshells to gain persistent access, deface websites, or deploy ransomware payloads.
If Mitigated
File uploads are blocked or properly validated, limiting impact to denial of service if upload attempts overwhelm the system.
🎯 Exploit Status
Exploitation requires only crafting a POST request with malicious file content; public references suggest proof-of-concept code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch is available; monitor the MCMS vendor for updates and apply immediately when released.
🔧 Temporary Workarounds
Block Vulnerable Endpoint
allUse web application firewall (WAF) or reverse proxy rules to block access to /ms/file/upload.do.
# Example for Apache: RewriteRule ^/ms/file/upload\.do$ - [F]
# Example for Nginx: location ~ ^/ms/file/upload\.do$ { deny all; }
Implement File Upload Validation
allAdd server-side validation to restrict file types, extensions, and content; store uploaded files outside web root.
# Custom implementation required in MCMS codebase
🧯 If You Can't Patch
- Isolate the MCMS system in a segmented network to limit lateral movement if compromised.
- Implement strict monitoring and alerting for file upload activities and unexpected file creations.
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a test file (e.g., harmless .txt) via POST to http://[target]/ms/file/upload.do; if successful without authentication, the system is vulnerable.Check Version:
Check MCMS version in admin panel or configuration files; default location may vary.Verify Fix Applied:
After applying workarounds, test the upload endpoint again; successful uploads should be blocked or properly validated.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /ms/file/upload.do with unusual file extensions (e.g., .jsp, .php, .asp)
- File creation events in web directories with suspicious names
Network Indicators:
- Unusual outbound connections from the MCMS server post-upload
- Spikes in traffic to the upload endpoint
SIEM Query:
source="web_logs" AND uri_path="/ms/file/upload.do" AND http_method="POST"