CVE-2025-41111
📋 TL;DR
An authorization bypass vulnerability in CanalDenuncia.app allows attackers to access other users' confidential information by manipulating the 'id_denuncia' parameter in API requests. This affects all users of the vulnerable application who have submitted reports through the platform. The vulnerability exposes sensitive user data without requiring proper authentication.
💻 Affected Systems
- CanalDenuncia.app
📦 What is this software?
Canaldenuncia.app by Canaldenuncia
⚠️ Risk & Real-World Impact
Worst Case
Mass data breach exposing all user-submitted reports, comments, and potentially personally identifiable information across the entire platform.
Likely Case
Targeted data extraction where attackers access specific users' report details and comments, potentially leading to privacy violations and information disclosure.
If Mitigated
Unauthorized access attempts are logged and blocked, with no data exposure beyond what users are authorized to view.
🎯 Exploit Status
Exploitation requires sending crafted POST requests but does not require authentication. The vulnerability is straightforward to exploit with basic web testing tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - check vendor advisory
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-canaldenunciaapp
Restart Required: Yes
Instructions:
1. Contact CanalDenuncia.app vendor for patched version. 2. Apply the security update to the web application. 3. Restart the application server. 4. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock or monitor requests to the vulnerable endpoint with parameter manipulation patterns
WAF specific - configure rule to block POST requests to '/backend/api/buscarComentariosByDenuncia.php' with suspicious id_denuncia parameters
Temporary Endpoint Disable
linuxDisable the vulnerable API endpoint until patched
# Apache: RewriteRule ^/backend/api/buscarComentariosByDenuncia\.php$ - [F]
# Nginx: location ~* /backend/api/buscarComentariosByDenuncia\.php { return 403; }
🧯 If You Can't Patch
- Implement strict authorization checks in application code to validate user permissions before processing id_denuncia parameter
- Deploy network segmentation to restrict access to the vulnerable endpoint and implement comprehensive logging/monitoring
🔍 How to Verify
Check if Vulnerable:
Send POST request to /backend/api/buscarComentariosByDenuncia.php with id_denuncia parameter set to another user's report ID. If you receive data you shouldn't have access to, the system is vulnerable.Check Version:
Check application version through admin interface or contact vendor for version informationVerify Fix Applied:
Repeat the vulnerable test after patching. The system should return authorization error or empty response when attempting to access unauthorized data.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authorization attempts on buscarComentariosByDenuncia.php
- Unusual access patterns to report IDs outside user's normal range
- POST requests with manipulated id_denuncia parameters
Network Indicators:
- Unusual traffic spikes to the vulnerable endpoint
- Repeated POST requests with sequential or random id_denuncia values
SIEM Query:
source="web_server" AND url="/backend/api/buscarComentariosByDenuncia.php" AND (parameter="id_denuncia" AND value NOT IN authorized_user_reports)