CVE-2022-2420
📋 TL;DR
CVE-2022-2420 is a critical unrestricted file upload vulnerability in URVE Web Manager's uploader.php file. Attackers on the local network can upload malicious files to execute arbitrary code or compromise the system. This affects URVE Web Manager installations with the vulnerable uploader.php component.
💻 Affected Systems
- URVE Web Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment within the local network.
Likely Case
Malicious file upload allowing attackers to establish persistence, deploy backdoors, or pivot to other systems on the network.
If Mitigated
Limited impact with proper network segmentation and file upload restrictions in place.
🎯 Exploit Status
Exploit disclosed publicly on GitHub. Attack requires local network access but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found in provided references
Restart Required: No
Instructions:
No official patch available. Check vendor website for updates or apply workarounds.
🔧 Temporary Workarounds
Disable or Restrict uploader.php
linuxRemove or restrict access to the vulnerable _internal/uploader.php file
mv /path/to/_internal/uploader.php /path/to/_internal/uploader.php.disabled
chmod 000 /path/to/_internal/uploader.php
Implement File Upload Restrictions
allAdd server-side validation for file uploads including file type checking and size limits
🧯 If You Can't Patch
- Implement strict network segmentation to isolate URVE Web Manager from critical systems
- Deploy web application firewall (WAF) rules to block malicious file upload patterns
🔍 How to Verify
Check if Vulnerable:
Check if _internal/uploader.php exists and is accessible from local network. Test file upload functionality.Check Version:
Unknown - check URVE Web Manager documentation or interface for version informationVerify Fix Applied:
Verify uploader.php is inaccessible or removed. Test that file uploads are properly validated.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to uploader.php
- Large or suspicious files in upload directories
- POST requests to _internal/uploader.php with executable files
Network Indicators:
- HTTP POST requests to */_internal/uploader.php from internal IPs
- Upload of executable file types (php, exe, etc.)
SIEM Query:
source="web_logs" AND uri="/_internal/uploader.php" AND method="POST" AND (file_extension="php" OR file_extension="exe" OR file_extension="jsp")🔗 References
- https://github.com/joinia/webray.com.cn/blob/main/URVE/URVE%20Web%20Manager%20uploader.php%20%20File%20upload%20vulnerability.md
- https://vuldb.com/?id.203903
- https://github.com/joinia/webray.com.cn/blob/main/URVE/URVE%20Web%20Manager%20uploader.php%20%20File%20upload%20vulnerability.md
- https://vuldb.com/?id.203903
