CVE-2024-40317
📋 TL;DR
This reflected cross-site scripting (XSS) vulnerability in MyNET allows attackers to inject malicious scripts into web pages by manipulating HTTP parameters. When users visit a specially crafted URL, the attacker can execute arbitrary JavaScript in their browser session. All users of MyNET up to version 26.08 are affected.
💻 Affected Systems
- MyNET
📦 What is this software?
Mynet by Airc
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as the authenticated user, redirect to malicious sites, or install malware via drive-by downloads.
Likely Case
Session hijacking, credential theft, or defacement of the application interface through injected content.
If Mitigated
Limited impact if proper input validation and output encoding are implemented, though some user interaction would still be required.
🎯 Exploit Status
The exploit requires user interaction (clicking a malicious link) but is trivial to craft once the vulnerable parameter is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.airc.pt/solucoes-servicos/solucoes?segment=MYN
Restart Required: No
Instructions:
Check the vendor advisory for patch availability. If a patch exists, apply it according to vendor instructions. Otherwise, implement workarounds.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block XSS payloads in HTTP parameters
Input Validation
allImplement server-side validation to sanitize or reject malicious input in HTTP parameters
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Use browser security features like HttpOnly and Secure flags for cookies
🔍 How to Verify
Check if Vulnerable:
Test by injecting a simple XSS payload like <script>alert('test')</script> into HTTP parameters and observing if it executesCheck Version:
Check MyNET version in administration interface or configuration filesVerify Fix Applied:
Retest with the same payload after implementing fixes; the script should not execute📡 Detection & Monitoring
Log Indicators:
- Unusual parameter values containing script tags or JavaScript code
- Multiple failed XSS attempts
Network Indicators:
- HTTP requests with suspicious parameter values containing script elements
SIEM Query:
source="web_logs" AND (param="*<script>*" OR param="*javascript:*")