CVE-2019-0301 in Identity Management
Summary
by MITRE
Under certain conditions, it is possible to request the modification of role or privilege assignments through SAP Identity Management REST Interface Version 2, which would otherwise be restricted only for viewing.
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Analysis
by VulDB Data Team • 09/19/2023
SAP Identity Management REST Interface Version 2 contains a critical authorization flaw that allows unauthorized modification of role and privilege assignments through REST API endpoints. This vulnerability specifically affects systems where SAP Identity Management is deployed and exposes a significant gap in the access control mechanisms that should normally prevent users from modifying administrative assignments. The flaw exists in the interface's permission validation logic, which fails to properly enforce the distinction between read-only operations and administrative modification functions. Attackers can exploit this weakness by crafting specific REST requests that bypass normal authorization checks, effectively allowing them to escalate privileges or modify user assignments without proper authentication or authorization.
The technical implementation of this vulnerability stems from inadequate input validation and insufficient privilege verification within the REST endpoint handlers. When legitimate users make requests to modify role assignments, the system should validate that the requesting user possesses the necessary administrative privileges before processing the modification. However, the vulnerability allows attackers to submit requests that appear to be read-only operations while actually containing modification parameters that are processed without proper authorization verification. This represents a classic case of insufficient authorization checks as classified under CWE-285, where the system fails to properly enforce access control policies for administrative functions. The REST interface design appears to lack proper separation of concerns between different operational modes, allowing modification operations to be executed through endpoints that should only support read access.
The operational impact of this vulnerability is severe and multifaceted, potentially enabling attackers to gain unauthorized administrative access to identity management systems. Successful exploitation could result in privilege escalation, unauthorized user account modifications, role assignment changes that compromise system security, and potential lateral movement within the enterprise environment. The vulnerability affects the core identity management functionality that controls user access to critical enterprise resources, making it particularly dangerous for organizations that rely heavily on centralized identity management for security controls. This flaw aligns with ATT&CK technique T1078.004 which covers valid accounts used for lateral movement, as compromised identity management systems can provide attackers with legitimate access to modify user privileges and gain access to additional systems. Organizations using SAP Identity Management are particularly vulnerable since the attack surface includes not only the primary identity management system but also any systems that rely on its role assignments for access control.
Mitigation strategies for this vulnerability should focus on immediate patching of affected SAP Identity Management systems with the vendor-provided security updates. Organizations should also implement network segmentation to restrict access to the REST interfaces to only authorized administrative systems and users. Additional controls include implementing comprehensive monitoring of REST API access patterns, particularly for modification operations, and establishing strict audit trails for all role and privilege assignment changes. The remediation process should include validating that the system properly enforces authorization boundaries between read-only and modification operations, ensuring that all REST endpoints properly validate user privileges before processing any administrative requests. Organizations should also review and strengthen their overall identity management access controls, implementing principle of least privilege principles and ensuring that administrative functions are properly separated from regular user access operations. Security teams should conduct thorough vulnerability assessments to identify any other potential authorization bypasses within the SAP Identity Management environment and related systems.