CVE-2025-40719
📋 TL;DR
A reflected cross-site scripting (XSS) vulnerability in Quiter Gateway allows attackers to execute malicious JavaScript in victims' browsers by crafting URLs with malicious payloads in the id_concesion parameter. This affects organizations using Quiter Gateway versions before 4.7.0. Attackers can steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- Quiter Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, sensitive data theft, or redirection to malicious sites leading to further compromise.
Likely Case
Session hijacking, credential theft, or defacement of the application interface.
If Mitigated
Limited impact if input validation and output encoding are properly implemented, though some risk remains.
🎯 Exploit Status
Exploitation requires tricking a user into clicking a malicious link, making it dependent on social engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.7.0
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-quiterweb-autoweb-quiter
Restart Required: Yes
Instructions:
1. Download Quiter Gateway version 4.7.0 or later from the vendor. 2. Backup current installation and data. 3. Apply the update following vendor instructions. 4. Restart the application/service.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to sanitize the id_concesion parameter, allowing only expected characters.
N/A - Requires code changes
Web Application Firewall (WAF) Rule
allDeploy a WAF rule to block requests containing suspicious patterns in the id_concesion parameter.
N/A - Configure via WAF interface
🧯 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 to limit impact.
🔍 How to Verify
Check if Vulnerable:
Test by accessing the vulnerable endpoint with a payload like /<Client>FacturaE/VerFacturaPDF?id_concesion=<script>alert('XSS')</script> and checking if script executes.Check Version:
Check application version via admin interface or configuration files as per vendor documentation.Verify Fix Applied:
After patching, repeat the test with the same payload; script execution should be blocked or sanitized.📡 Detection & Monitoring
Log Indicators:
- Log entries showing requests to /<Client>FacturaE/VerFacturaPDF with suspicious id_concesion values containing script tags or JavaScript.
Network Indicators:
- HTTP requests with URL parameters containing encoded script payloads.
SIEM Query:
source="web_logs" AND uri="/<Client>FacturaE/VerFacturaPDF" AND (param="id_concesion" AND value MATCHES "<script.*>.*</script>" OR "javascript:")