CVE-2025-41339
📋 TL;DR
An authorization bypass vulnerability in CanalDenuncia.app allows attackers to access other users' confidential information by manipulating the 'id_sociedad' parameter in API requests. This affects all users of the vulnerable application who have sensitive data stored in the system.
💻 Affected Systems
- CanalDenuncia.app
📦 What is this software?
Canaldenuncia.app by Canaldenuncia
⚠️ Risk & Real-World Impact
Worst Case
Mass data breach exposing all user reports, personal information, and confidential whistleblower submissions across all organizations using the platform.
Likely Case
Targeted data extraction of specific users' reports and personal information, potentially leading to privacy violations and reputational damage.
If Mitigated
Limited exposure if proper authentication and authorization checks are implemented, restricting access to authorized users only.
🎯 Exploit Status
Exploitation requires sending crafted POST requests but does not require authentication to the target user's account.
🛠️ 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 security update to backend API. 3. Restart application services. 4. Verify authorization checks are properly implemented.
🔧 Temporary Workarounds
API Endpoint Restriction
allTemporarily block or restrict access to the vulnerable endpoint
# Web server configuration to block /backend/api/buscarTipoDenuncia.php
# Example for Apache: RewriteRule ^/backend/api/buscarTipoDenuncia\.php$ - [F]
# Example for Nginx: location ~* /backend/api/buscarTipoDenuncia\.php { deny all; }
Input Validation Enhancement
allAdd server-side validation for id_sociedad parameter
# PHP example: validate user has permission to access requested sociedad
if (!hasPermission($_SESSION['user_id'], $_POST['id_sociedad'])) { http_response_code(403); exit; }
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the application from untrusted networks
- Deploy a Web Application Firewall (WAF) with rules to detect and block unauthorized parameter manipulation
🔍 How to Verify
Check if Vulnerable:
Test by sending POST requests to /backend/api/buscarTipoDenuncia.php with different id_sociedad values while authenticated as one user to see if you can access other organizations' data.Check Version:
Check application version in admin panel or contact vendor for version informationVerify Fix Applied:
Attempt the same exploitation test after patch - should receive authorization error (403) when trying to access unauthorized sociedad data.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /backend/api/buscarTipoDenuncia.php with varying id_sociedad values from same IP/session
- Access logs showing successful 200 responses for sociedad IDs not associated with the authenticated user
Network Indicators:
- Unusual pattern of POST requests to the vulnerable endpoint
- Traffic spikes to the API endpoint from suspicious sources
SIEM Query:
source="web_server" AND url="/backend/api/buscarTipoDenuncia.php" AND response_code=200 | stats count by src_ip, user_agent, form_data.id_sociedad