CVE-2025-2855
📋 TL;DR
A deserialization vulnerability in elunez eladmin's file upload function allows remote attackers to manipulate server arguments. This affects eladmin versions up to 2.7, potentially enabling arbitrary code execution or system compromise.
💻 Affected Systems
- elunez eladmin
📦 What is this software?
Eladmin by Eladmin
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system takeover, data exfiltration, or deployment of persistent backdoors.
Likely Case
Server compromise allowing unauthorized access, data manipulation, or service disruption.
If Mitigated
Limited impact with proper input validation and network segmentation preventing exploitation.
🎯 Exploit Status
Remote exploitation possible via manipulation of servers argument.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.8 or later
Vendor Advisory: https://github.com/elunez/eladmin/issues/873
Restart Required: Yes
Instructions:
1. Update eladmin to version 2.8 or later. 2. Restart the application server. 3. Verify the fix by testing the upload endpoint.
🔧 Temporary Workarounds
Disable vulnerable endpoint
allBlock or disable access to /api/deploy/upload endpoint
# Configure web server to block /api/deploy/upload
# Example for nginx: location /api/deploy/upload { deny all; }
Input validation filter
allImplement strict input validation for servers parameter
# Add validation in checkFile function
# Example: Validate servers parameter format before processing
🧯 If You Can't Patch
- Implement network segmentation to isolate eladmin instances
- Deploy web application firewall with deserialization attack rules
🔍 How to Verify
Check if Vulnerable:
Check eladmin version - if version ≤ 2.7, system is vulnerable. Review application logs for suspicious upload attempts.Check Version:
Check application configuration or package manager for eladmin versionVerify Fix Applied:
Confirm eladmin version is ≥ 2.8. Test /api/deploy/upload endpoint with various inputs to ensure proper validation.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload patterns
- Malformed servers parameter in requests
- Deserialization errors in application logs
Network Indicators:
- HTTP POST requests to /api/deploy/upload with manipulated parameters
- Unusual outbound connections from eladmin server
SIEM Query:
source="eladmin" AND (url="/api/deploy/upload" OR message="deserialization")