CVE-2021-33712 in Mendix SAML Module
Summary
by MITRE • 06/09/2021
A vulnerability has been identified in Mendix SAML Module (All versions < V2.1.2). The configuration of the SAML module does not properly check various restrictions and validations imposed by an identity provider. This could allow a remote authenticated attacker to escalate privileges.
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Analysis
by VulDB Data Team • 06/11/2021
The vulnerability CVE-2021-33712 affects the Mendix SAML Module across all versions prior to V2.1.2, representing a critical security flaw that undermines the integrity of identity authentication processes within Mendix applications. This issue stems from insufficient validation mechanisms within the SAML configuration handling, specifically failing to properly enforce restrictions and validations that should be imposed by identity providers during the authentication workflow. The vulnerability exists within the module's processing of SAML assertions and authentication responses, creating a potential pathway for unauthorized privilege escalation.
The technical flaw manifests in the module's inadequate validation of SAML attributes and assertion parameters that are typically enforced by identity providers to maintain security boundaries. When an attacker successfully authenticates through the SAML module, the system fails to verify that the received assertion adheres to the expected validation criteria imposed by the identity provider. This oversight allows malicious actors to manipulate SAML assertion parameters such as roles, permissions, or user attributes, potentially enabling them to assume elevated privileges within the Mendix application. The vulnerability specifically targets the module's trust relationship with identity providers, where proper validation should occur but does not.
The operational impact of this vulnerability extends beyond simple authentication bypasses, as it enables authenticated attackers to escalate their privileges within the application environment. An attacker who has gained initial access through legitimate means can exploit this weakness to assume roles or permissions that should not be available to their current authenticated session. This privilege escalation capability directly violates fundamental security principles and can lead to complete system compromise, data exfiltration, or unauthorized administrative access. The vulnerability affects any Mendix application that utilizes the affected SAML module, potentially exposing sensitive business applications to unauthorized access.
Organizations should immediately upgrade to Mendix SAML Module version 2.1.2 or later to remediate this vulnerability, as this release contains the necessary validation fixes. Additionally, security teams should conduct comprehensive assessments of their SAML configurations to ensure proper enforcement of identity provider restrictions and implement monitoring for suspicious authentication patterns. The vulnerability aligns with CWE-284, which addresses improper access control in software systems, and maps to ATT&CK technique T1078.004 for valid accounts and privilege escalation. Organizations should also review their SAML implementation against NIST SP 800-63B guidelines for identity provider validation and consider implementing additional security controls such as multi-factor authentication and continuous monitoring of authentication events.