CVE-2023-53888
📋 TL;DR
CVE-2023-53888 is a remote code execution vulnerability in Zomplog 3.9 that allows authenticated attackers to upload malicious JavaScript files, rename them to PHP, and execute arbitrary system commands. This affects all Zomplog 3.9 installations with authenticated user access. Attackers can gain complete control of affected systems.
💻 Affected Systems
- Zomplog
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, steal data, install malware, or pivot to other systems.
Likely Case
Authenticated attackers gaining shell access, defacing websites, or installing backdoors for persistent access.
If Mitigated
Limited impact if proper authentication controls, file upload restrictions, and web application firewalls are in place.
🎯 Exploit Status
Exploit requires authenticated access but is straightforward to execute with publicly available proof-of-concept code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: None
Restart Required: No
Instructions:
No official patch available. Zomplog appears to be abandoned software. Consider migrating to supported alternatives.
🔧 Temporary Workarounds
Disable file upload functionality
allRemove or restrict access to file upload endpoints in Zomplog configuration.
Modify Zomplog configuration to disable saveE and rename actions
Implement file extension filtering
linuxConfigure web server or application to block execution of uploaded files with .php extension.
Add to .htaccess: <FilesMatch "\.php$"> Deny from all </FilesMatch>
🧯 If You Can't Patch
- Isolate Zomplog installation in a restricted network segment with no internet access
- Implement strict access controls and multi-factor authentication for Zomplog admin interface
🔍 How to Verify
Check if Vulnerable:
Check if running Zomplog version 3.9 and verify file upload endpoints are accessible to authenticated users.Check Version:
Check Zomplog configuration files or admin interface for version information.Verify Fix Applied:
Test if file upload and rename functionality no longer allows PHP file execution.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to Zomplog directories
- File rename operations from .js to .php
- Execution of PHP files from upload directories
Network Indicators:
- POST requests to saveE or rename endpoints with file manipulation parameters
SIEM Query:
source="zomplog.log" AND (action="saveE" OR action="rename") AND (file_extension="php" OR file_content="system(")