CVE-2024-39323

Executive Summary

CVE-2024-39323 is an improper access control vulnerability in the Aimeos GraphQL API admin interface (ai-admin-graphql). An authenticated user with editor-level privileges can escalate their privileges to take over an admin account in the backend. This vulnerability affects versions starting from 2022.04.01 up to, but not including, the patched versions 2022.10.10, 2023.10.6, and 2024.04.6. The CVSS score is 7.1 (High), and the attack complexity is low, requiring only low privileges and no user interaction. The vulnerability allows an editor to modify and take over an admin account, leading to a complete compromise of the backend administration.

Supply Chain & Package Security

This vulnerability affects the ai-admin-graphql package, which is a PHP package distributed via Composer (Packagist). Organizations using Aimeos should verify their dependency version and update to a patched release immediately. The package is a core component of the Aimeos e-commerce framework, and a compromise of the admin interface can lead to data breaches, unauthorized transactions, and full site takeover.

CVSS Breakdown & Threat Level

• CVSS Score: 7.1 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
• Attack Vector (AV): Network (N) - The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low (L) - No special conditions are required.
• Privileges Required (PR): Low (L) - An editor account is needed.
• User Interaction (UI): None (N) - No user action is required.
• Scope (S): Unchanged (U) - The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) - An attacker can access all admin data.
• Integrity (I): High (H) - An attacker can modify admin accounts and data.
• Availability (A): None (N) - The vulnerability does not affect availability.

Threat Level: High. The low attack complexity and low privileges required make this a significant threat for any Aimeos deployment with editor-level users.

Deep Dive & Mechanics

The vulnerability resides in the GraphQL API admin interface (ai-admin-graphql). The improper access control allows an editor to perform mutations (modifications) that should be restricted to administrators. Specifically, the GraphQL mutations for user management do not properly check if the requesting user has the admin role. An editor can craft a GraphQL mutation to modify the email, password, or role of an existing admin account, effectively taking it over.

The core issue is a missing or insufficient authorization check in the GraphQL resolver functions. The application relies on the user's role to determine access, but the check is either absent or can be bypassed. The fix involves adding proper role validation to all sensitive mutations.

Vulnerable vs. Patched Code

The vulnerable code likely lacks a role check in the GraphQL mutation resolver. For example, a mutation to update a user might look like this:

Vulnerable Code (Conceptual):

class UserMutation {
    public function updateUser($id, $data) {
        // No role check - any authenticated user can call this
        $user = User::find($id);
        $user->update($data);
        return $user;
    }
}

Patched Code (Conceptual):

class UserMutation {
    public function updateUser($id, $data) {
        // Proper role check
        if (!Auth::user()->hasRole('admin')) {
            throw new AuthorizationException('Only admins can update users.');
        }
        $user = User::find($id);
        $user->update($data);
        return $user;
    }
}

The patched versions (2022.10.10, 2023.10.6, 2024.04.6) include these authorization checks.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A running Aimeos instance with a vulnerable version.
• An editor account (e.g., editor@example.com / password).
• An admin account to target (e.g., admin@example.com).

Exploitation Steps:

1. Authenticate as Editor: Obtain a valid session token or API key for the editor account.
2. Craft GraphQL Mutation: Send a mutation to change the admin's email and password. The exact mutation depends on the Aimeos GraphQL schema, but a typical example is:

   mutation {
     updateUser(
       id: "admin_user_id"
       input: {
         email: "attacker@example.com"
         password: "newpassword123"
       }
     ) {
       id
       email
     }
   }
   

3. Execute Mutation: Send the mutation to the GraphQL endpoint (e.g., /admin/graphql).
4. Takeover: The admin account's email and password are now changed. Log in as the admin using the new credentials.
5. Post-Exploitation: With admin access, the attacker can modify products, orders, and other sensitive data.

Lab Setup:

• Use Docker to spin up a vulnerable Aimeos instance.
• Create an editor and an admin user.
• Use a tool like Postman, Insomnia, or curl to send the GraphQL mutation.

Blue Team

Detection:

• Monitor GraphQL API logs for mutations targeting user objects (updateUser, updateCustomer, etc.) from non-admin users.
• Alert on any changes to admin account email addresses or passwords.
• Monitor for multiple failed login attempts followed by a successful login from a new IP for an admin account.

Hunting:

• Search for GraphQL queries that include updateUser or similar mutations.
• Correlate user ID changes with the requesting user's role.
• Review audit logs for any modifications to user roles or permissions.

Indicators of Compromise (IOCs)

• Network:
  • GraphQL mutation requests to /admin/graphql containing updateUser or updateCustomer with email and password fields.
  • Unusual login events for admin accounts from new IP addresses.
• System:
  • Changes to admin user email addresses or passwords in the database.
  • New admin accounts created by non-admin users.
• Logs:
  • Application logs showing updateUser mutations from users with the editor role.
  • Authentication logs showing successful logins for admin accounts immediately after a password change.

Detection Engineering

YARA Rule

rule Detect_Aimeos_Admin_Takeover_GraphQL {
    meta:
        description = "Detects GraphQL mutations targeting admin user takeover in Aimeos"
        author = "Valters IT"
        date = "2024-01-01"
        reference = "CVE-2024-39323"
    strings:
        $mutation = /mutation\s*\{[^}]*updateUser\s*\([^)]*\)\s*\{[^}]*email[^}]*password[^}]*\}/ nocase
        $mutation2 = /mutation\s*\{[^}]*updateCustomer\s*\([^)]*\)\s*\{[^}]*email[^}]*password[^}]*\}/ nocase
    condition:
        any of them
}

Sigma Rule

title: Aimeos Admin Takeover via GraphQL
id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
status: experimental
description: Detects GraphQL mutations that attempt to modify admin user credentials
author: Valters IT
date: 2024/01/01
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-39323
logsource:
    category: application
    product: aimeos
detection:
    selection:
        http.url: "/admin/graphql"
        http.method: POST
        http.body|contains: 
            - "updateUser"
            - "updateCustomer"
        http.body|contains|all:
            - "email"
            - "password"
    condition: selection
falsepositives:
    - Legitimate admin actions (should be rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"Aimeos Admin Takeover via GraphQL"; flow:to_server; content:"POST"; http_method; content:"/admin/graphql"; http_uri; content:"updateUser"; http_client_body; content:"email"; http_client_body; content:"password"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Upgrade: Update ai-admin-graphql to version 2022.10.10, 2023.10.6, or 2024.04.6 (or later).
2. Review User Accounts: Audit all admin accounts for unauthorized changes. Reset passwords for any suspicious accounts.
3. Restrict Editor Privileges: If possible, temporarily disable editor accounts or restrict their access to the GraphQL API.

Long-Term Mitigations:

• Implement strict role-based access control (RBAC) for all GraphQL mutations.
• Enable detailed audit logging for all user management actions.
• Regularly review and update dependencies.
• Use a Web Application Firewall (WAF) to block suspicious GraphQL requests.

Valters IT