CVE-2024-33500: Mendix Applications Privilege Escalation

CVE-2024-33500 Overview

A privilege escalation vulnerability has been identified in Mendix Applications that affects multiple versions of the Mendix platform. This vulnerability allows users with the capability to manage roles to elevate the access rights of users assigned to those roles. The flaw exists in the role management functionality, where an attacker with role management privileges can exploit improper privilege management (CWE-269) to grant elevated permissions to other users.

Critical Impact

Attackers with role management capabilities can escalate privileges of users within their managed roles, potentially leading to unauthorized access to sensitive application data and functionality. Successful exploitation requires guessing the ID of a target role containing the elevated access rights.

Affected Products

• Mendix Applications using Mendix 10 (All versions < V10.11.0)
• Mendix Applications using Mendix 10 (V10.6) (All versions < V10.6.9)
• Mendix Applications using Mendix 9 (All versions >= V9.3.0 < V9.24.22)

Discovery Timeline

• 2024-06-11 - CVE CVE-2024-33500 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-33500

Vulnerability Analysis

This vulnerability stems from improper privilege management (CWE-269) within the Mendix application framework's role management system. The flaw allows users who possess role management capabilities to manipulate the access rights associated with roles they manage, effectively enabling them to grant elevated permissions to users assigned to those roles.

The exploitation chain involves an attacker with legitimate role management permissions identifying and guessing the internal identifier of a target role that contains higher-level access rights. Once the correct role ID is determined, the attacker can associate elevated permissions with users under their role management scope.

The network-accessible nature of this vulnerability allows remote exploitation, though successful attacks require high privileges (role management capability) and the ability to correctly guess or enumerate role identifiers. This represents an access control weakness where the application fails to properly validate and restrict the scope of role modifications.

Root Cause

The root cause is improper privilege management (CWE-269) in the Mendix platform's role management functionality. The application does not adequately validate whether a user with role management privileges is authorized to assign or modify specific access rights associated with roles. This allows a privileged user to assign access rights beyond their intended scope, leading to privilege escalation for users within their managed roles.

Attack Vector

The attack vector is network-based, requiring authenticated access with role management privileges. The attacker must:

1. Obtain legitimate access to the Mendix application with role management capabilities
2. Identify or enumerate potential target role IDs that contain elevated access rights
3. Exploit the improper privilege management to associate elevated permissions with users in their managed roles

The vulnerability does not require user interaction and can be exploited remotely. However, the attack complexity is increased by the requirement to correctly guess the target role ID.

The exploitation mechanism involves manipulating role assignments through the application's role management interface. Since no verified code examples are available, the vulnerability manifests in the role assignment logic where insufficient authorization checks allow cross-role permission escalation. For technical implementation details, refer to the Siemens Security Advisory SSA-540640.

Detection Methods for CVE-2024-33500

Indicators of Compromise

• Unusual role modification activities from users with role management privileges
• Access right changes to roles that were not authorized through normal change management procedures
• User accounts suddenly gaining elevated permissions without corresponding administrative approval
• Audit log entries showing role ID enumeration attempts or sequential role access patterns

Detection Strategies

• Monitor application audit logs for role modification events, particularly those involving permission escalation
• Implement anomaly detection for role management operations that result in privilege elevation
• Track and alert on any role modifications that assign permissions outside the expected scope for the modifying user
• Deploy SentinelOne Singularity Platform to detect suspicious behavioral patterns in Mendix application environments

Monitoring Recommendations

• Enable comprehensive audit logging for all role management operations within Mendix applications
• Configure alerts for role modifications that result in elevated access rights
• Regularly review user access rights and role assignments to identify unauthorized privilege changes
• Implement role ID access monitoring to detect potential enumeration activities

How to Mitigate CVE-2024-33500

Immediate Actions Required

• Upgrade Mendix 10 applications to version V10.11.0 or later
• Upgrade Mendix 10 (V10.6) applications to version V10.6.9 or later
• Upgrade Mendix 9 applications to version V9.24.22 or later
• Review and audit all role management permissions to ensure principle of least privilege
• Conduct an immediate review of recent role modifications to identify potential exploitation

Patch Information

Siemens has released security updates to address this vulnerability. Affected organizations should upgrade to the patched versions as specified in the Siemens Security Advisory SSA-540640:

Workarounds

• Restrict role management capabilities to the minimum number of trusted administrators
• Implement additional authorization controls around role modification operations
• Enable enhanced audit logging to detect potential exploitation attempts
• Consider implementing role ID obfuscation or randomization to reduce enumeration risk
• Apply network segmentation to limit access to Mendix application administration interfaces

# Review Mendix application version and plan upgrade
# Check current Mendix runtime version
mendix-runtime --version

# Apply security updates according to your deployment method
# For Docker-based deployments, update to patched container images
# For on-premises deployments, follow Siemens update procedures