CVE-2021-46079
📋 TL;DR
An Unrestricted File Upload vulnerability in Vehicle Service Management System 1.0 allows remote attackers to upload malicious files containing HTML injection payloads. This affects all deployments of the vulnerable software version. Attackers can execute arbitrary HTML/JavaScript in victim browsers.
💻 Affected Systems
- Sourcecodester Vehicle Service Management System
📦 What is this software?
Vehicle Service Management System by Vehicle Service Management System Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via HTML injection leading to session hijacking, credential theft, or further exploitation through chained attacks.
Likely Case
HTML injection leading to defacement, phishing attacks, or limited data exfiltration from user sessions.
If Mitigated
No impact if file uploads are properly validated and sanitized.
🎯 Exploit Status
Public proof-of-concept demonstrates file upload without authentication. Simple exploitation requiring only web access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
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
Implement File Upload Validation
allAdd server-side validation to restrict file uploads to allowed types and sanitize content.
Web Application Firewall Rules
allConfigure WAF to block malicious file uploads and HTML injection attempts.
🧯 If You Can't Patch
- Disable file upload functionality entirely in the application.
- Implement network segmentation to isolate the vulnerable system from critical assets.
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a file with HTML/JavaScript content to the file upload endpoint. If accepted without validation, system is vulnerable.Check Version:
Check application version in admin panel or configuration files.Verify Fix Applied:
Test file upload with malicious content; it should be rejected or sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads, especially with .html/.htm extensions or suspicious content patterns.
Network Indicators:
- HTTP POST requests to upload endpoints with unusual file types or sizes.
SIEM Query:
source="web_server" AND (method="POST" AND uri="*upload*" AND (file_extension="html" OR file_extension="htm"))🔗 References
- https://github.com/plsanu/Vehicle-Service-Management-System-Multiple-File-upload-Leads-to-Html-Injection
- https://www.plsanu.com/vehicle-service-management-system-multiple-file-upload-leads-to-html-injection
- https://github.com/plsanu/Vehicle-Service-Management-System-Multiple-File-upload-Leads-to-Html-Injection
- https://www.plsanu.com/vehicle-service-management-system-multiple-file-upload-leads-to-html-injection
