CVE-2025-41337 Overview
A lack of authorization vulnerability has been detected in CanalDenuncia.app. This vulnerability allows an attacker to access other users' information by sending a POST request through the parameter web in /backend/api/buscarSSOParametros.php. This authorization bypass flaw (CWE-862: Missing Authorization) enables unauthenticated attackers to enumerate and retrieve sensitive user data without proper access controls.
Critical Impact
Unauthorized access to user information through missing authorization checks in the API endpoint, potentially exposing sensitive data across the platform.
Affected Products
- CanalDenuncia CanalDenuncia.app (all versions)
Discovery Timeline
- 2025-11-04 - CVE-2025-41337 published to NVD
- 2025-11-05 - Last updated in NVD database
Technical Details for CVE-2025-41337
Vulnerability Analysis
This vulnerability stems from a missing authorization mechanism (CWE-862) in the CanalDenuncia.app web application. The affected endpoint /backend/api/buscarSSOParametros.php fails to verify whether the requesting user has appropriate permissions to access the requested data. An attacker can exploit this flaw by manipulating the web POST parameter to retrieve information belonging to other users.
The vulnerability is accessible over the network without authentication, meaning any remote attacker can potentially exploit this issue to access sensitive user information. The confidentiality impact is significant as attackers can retrieve data that should be restricted to authorized users only.
Root Cause
The root cause of this vulnerability is the absence of proper authorization checks in the buscarSSOParametros.php API endpoint. The application accepts user-supplied input via the web parameter and returns SSO (Single Sign-On) parameters without validating whether the requesting party has legitimate access to the requested information. This is a classic Insecure Direct Object Reference (IDOR) pattern where user-controlled input directly references backend resources without access control validation.
Attack Vector
The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:
- Identifying the vulnerable endpoint at /backend/api/buscarSSOParametros.php
- Crafting malicious POST requests with manipulated web parameter values
- Iterating through potential values to enumerate and extract user information
- Collecting sensitive data that should be protected by authorization controls
The vulnerability does not require any privileges to exploit, making it accessible to anonymous attackers. The attack complexity is low as no special conditions or sophisticated techniques are required.
Detection Methods for CVE-2025-41337
Indicators of Compromise
- Unusual POST request patterns to /backend/api/buscarSSOParametros.php endpoint
- High volume of requests with varying web parameter values from single IP addresses
- Access log entries showing sequential or enumeration-style parameter values
- Requests to the SSO parameter endpoint from unexpected geographic locations or IP ranges
Detection Strategies
- Implement web application firewall (WAF) rules to detect and block suspicious POST request patterns to the affected endpoint
- Monitor API access logs for anomalous request frequencies targeting buscarSSOParametros.php
- Deploy intrusion detection system (IDS) signatures to identify parameter enumeration attempts
- Enable rate limiting on the affected API endpoint to detect and throttle potential exploitation attempts
Monitoring Recommendations
- Configure alerting for unusual access patterns to the /backend/api/ directory
- Establish baseline metrics for normal API usage and alert on deviations
- Monitor for data exfiltration indicators such as large response payloads from the affected endpoint
- Review authentication logs for correlation with API access patterns
How to Mitigate CVE-2025-41337
Immediate Actions Required
- Restrict access to the /backend/api/buscarSSOParametros.php endpoint until a patch is available
- Implement network-level access controls to limit exposure of the vulnerable endpoint
- Deploy WAF rules to block unauthorized access attempts to the affected API
- Review access logs for potential historical exploitation and assess data exposure
Patch Information
Refer to the INCIBE Security Notice for official vendor guidance and patch availability. Organizations should monitor this advisory for updates regarding security fixes from CanalDenuncia.
Workarounds
- Implement server-side authorization checks to validate user permissions before returning data
- Add authentication requirements to the affected API endpoint
- Deploy IP-based access restrictions to limit endpoint access to trusted networks only
- Consider disabling the vulnerable endpoint temporarily if not critical to business operations
# Example: Apache .htaccess restriction for the vulnerable endpoint
<Files "buscarSSOParametros.php">
Order Deny,Allow
Deny from all
Allow from 192.168.1.0/24
</Files>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
