CVE-2025-41336
📋 TL;DR
An authorization bypass vulnerability in CanalDenuncia.app allows attackers to access other users' information by manipulating the 'web' parameter in a POST request to '/backend/api/buscarConfiguracionParametros.php'. This affects all users of the vulnerable application who have their 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 information including potentially sensitive personal data, whistleblower identities, and confidential reports.
Likely Case
Targeted data extraction of specific users' information leading to privacy violations and potential identity theft.
If Mitigated
No unauthorized access occurs due to proper authorization checks and parameter validation.
🎯 Exploit Status
Exploitation requires sending crafted POST requests but does not require authentication to the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version
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 vendor-provided patch. 3. Restart application services. 4. Verify fix implementation.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock or sanitize requests to '/backend/api/buscarConfiguracionParametros.php' with suspicious 'web' parameter values
WAF-specific configuration required
Input Validation Filter
allImplement server-side validation to restrict 'web' parameter to expected values only
Application-specific code modification required
🧯 If You Can't Patch
- Isolate the application behind strict network segmentation to limit access
- Implement comprehensive logging and monitoring of all requests to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Send POST request to '/backend/api/buscarConfiguracionParametros.php' with manipulated 'web' parameter and observe if unauthorized data is returnedCheck Version:
Check application version through admin interface or contact vendorVerify Fix Applied:
Attempt the same exploit after patching and confirm access is properly denied with appropriate error messages📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to '/backend/api/buscarConfiguracionParametros.php' with unusual 'web' parameter values
- Access logs showing data retrieval patterns inconsistent with normal user behavior
Network Indicators:
- Unusual traffic patterns to the vulnerable endpoint
- POST requests with manipulated parameters
SIEM Query:
source="web_server" AND uri="/backend/api/buscarConfiguracionParametros.php" AND method="POST" AND (parameter="web" AND value!="expected_value")