CVE-2023-38915
📋 TL;DR
CVE-2023-38915 is a critical file upload vulnerability in Wolf-leo EasyAdmin8 v1.0 that allows remote attackers to upload malicious files and execute arbitrary code on the server. This affects all systems running the vulnerable version of EasyAdmin8, particularly web servers with the admin interface exposed.
💻 Affected Systems
- Wolf-leo EasyAdmin8
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, data exfiltration, ransomware deployment, and lateral movement to other systems.
Likely Case
Webshell installation leading to persistent backdoor access, data theft, and further exploitation of the compromised server.
If Mitigated
Limited impact with proper file upload restrictions, but potential for denial of service or limited file system access.
🎯 Exploit Status
The vulnerability is simple to exploit with publicly available proof-of-concept code. Attackers can upload malicious files directly through the admin interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider migrating to alternative software or implementing strict workarounds.
🔧 Temporary Workarounds
Restrict File Upload Types
allImplement server-side validation to only allow specific safe file extensions and verify file content.
Implement in application code: validate file extensions, MIME types, and scan for malicious content
Disable Upload Function
allTemporarily disable the vulnerable upload functionality in the admin interface.
Comment out or remove upload-related code in EasyAdmin8 files
🧯 If You Can't Patch
- Isolate the EasyAdmin8 instance in a restricted network segment with no internet access
- Implement web application firewall (WAF) rules to block file upload requests to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Check if EasyAdmin8 v1.0 is installed by examining the application version in admin interface or configuration files.Check Version:
Check configuration files or admin interface for version information. No standard command available.Verify Fix Applied:
Test if file upload functionality is properly restricted or disabled. Attempt to upload a malicious file to verify controls are working.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to admin interface
- Files with suspicious extensions (.php, .jsp, .asp) in upload directories
- Multiple failed upload attempts
Network Indicators:
- POST requests to upload endpoints with unusual file types
- Traffic patterns indicating file upload exploitation
SIEM Query:
source="web_server" AND (uri="/admin/upload" OR uri CONTAINS "upload") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")