CVE-2024-10288
📋 TL;DR
This Cross-Site Scripting (XSS) vulnerability in LocalServer 1.0.9 allows attackers to inject malicious scripts via the ListName parameter in the /mlss/SubscribeToList endpoint. When exploited, it can steal authenticated users' session details. Organizations running LocalServer 1.0.9 are affected.
💻 Affected Systems
- LocalServer
📦 What is this software?
Localserver by Ujangrohidin
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrative session tokens, gain full system access, and potentially compromise the entire server infrastructure.
Likely Case
Session hijacking leading to unauthorized access to sensitive data and functionality within the LocalServer application.
If Mitigated
Limited impact with proper input validation and output encoding preventing script execution.
🎯 Exploit Status
Exploitation requires social engineering to deliver malicious payload to authenticated users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-xss-vulnerabilities-localserver
Restart Required: No
Instructions:
1. Monitor vendor for security updates. 2. Apply patches when available. 3. Test in non-production environment first.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and sanitization of the ListName parameter to remove or encode malicious scripts.
Implement input validation in application code for ListName parameter
Web Application Firewall (WAF) Rules
allConfigure WAF to block requests containing XSS payloads targeting the /mlss/SubscribeToList endpoint.
Add WAF rule to detect and block malicious ListName parameter values
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Restrict access to /mlss/SubscribeToList endpoint to trusted users only
🔍 How to Verify
Check if Vulnerable:
Test the /mlss/SubscribeToList endpoint with XSS payloads in the ListName parameter and check if scripts execute.Check Version:
Check LocalServer version in application interface or configuration filesVerify Fix Applied:
Retest with XSS payloads after implementing fixes to confirm scripts are properly sanitized or blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to /mlss/SubscribeToList with encoded scripts in parameters
- Multiple failed authentication attempts followed by XSS payload requests
Network Indicators:
- HTTP requests containing script tags or JavaScript in ListName parameter
- Traffic patterns showing social engineering attempts
SIEM Query:
source="webserver" AND uri="/mlss/SubscribeToList" AND (query="<script>" OR query="javascript:")