CVE-2020-25537
📋 TL;DR
UCMS 1.5.0 contains an arbitrary file upload vulnerability (CWE-434) that allows attackers to upload malicious files to the server. This can lead to remote code execution and complete server compromise. All systems running UCMS 1.5.0 are affected.
💻 Affected Systems
- UCMS
📦 What is this software?
Ucms by Ucms Project
⚠️ Risk & Real-World Impact
Worst Case
Full server takeover with administrative privileges, data exfiltration, ransomware deployment, and persistent backdoor installation.
Likely Case
Webshell upload leading to command execution, data theft, and lateral movement within the network.
If Mitigated
File upload attempts blocked or quarantined with no successful exploitation.
🎯 Exploit Status
Multiple public proof-of-concept exploits demonstrate webshell upload leading to remote code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
File Upload Restriction
allImplement strict file type validation and whitelist allowed extensions.
Web Application Firewall Rules
allDeploy WAF rules to block malicious file upload patterns.
🧯 If You Can't Patch
- Disable file upload functionality entirely if not required.
- Implement network segmentation to isolate UCMS from critical systems.
🔍 How to Verify
Check if Vulnerable:
Check UCMS version in admin panel or configuration files. Version 1.5.0 is vulnerable.Check Version:
Check admin panel or config files for version information.Verify Fix Applied:
Test file upload functionality with malicious files to ensure they are rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to UCMS directories
- Execution of suspicious files in upload directories
Network Indicators:
- HTTP POST requests with file uploads to UCMS endpoints
SIEM Query:
source="web_logs" AND uri="*upload*" AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")🔗 References
- https://github.com/BigTiger2020/UCMS/blob/main/UCMS%20v1.5.0%20Arbitrary%20file%20upload%20vulnerability%20get%20shell.md
- https://sunian19.github.io/2020/09/11/UCMS%20v1.5.0%20Arbitrary%20file%20upload%20vulnerability/
- https://github.com/BigTiger2020/UCMS/blob/main/UCMS%20v1.5.0%20Arbitrary%20file%20upload%20vulnerability%20get%20shell.md
- https://sunian19.github.io/2020/09/11/UCMS%20v1.5.0%20Arbitrary%20file%20upload%20vulnerability/
