CVE-2019-0306 in HANA Extended Application Services
Summary
by MITRE
SAP HANA Extended Application Services (advanced model), version 1, allows authenticated low privileged XS Advanced Platform users such as SpaceAuditors to execute requests to obtain a complete list of SAP HANA user IDs and names.
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Analysis
by VulDB Data Team • 10/03/2023
SAP HANA Extended Application Services advanced model presents a significant information disclosure vulnerability that affects version 1 implementations. This flaw enables authenticated users with minimal privileges to escalate their access and obtain comprehensive lists of SAP HANA user identities. The vulnerability specifically targets the XS Advanced Platform environment where users with SpaceAuditor roles can exploit the system's insufficient access controls to gather sensitive user information.
The technical implementation flaw resides in the inadequate privilege separation mechanisms within the SAP HANA Extended Application Services framework. When SpaceAuditor users make authenticated requests to the system, they can traverse the application layer to access user enumeration endpoints that should only be available to administrators or users with elevated privileges. This represents a classic case of insufficient authorization checks where the system fails to properly validate user permissions before granting access to sensitive user data. The vulnerability operates at the application layer and leverages the inherent trust model within the XS Advanced Platform to bypass normal security boundaries.
The operational impact of this vulnerability extends beyond simple information disclosure, creating potential pathways for further exploitation within the SAP HANA environment. An attacker with SpaceAuditor privileges can compile comprehensive user directories that may include administrative accounts, developers, and other privileged users who could serve as targets for additional attacks. This information can be leveraged for credential stuffing attacks against other systems, social engineering campaigns, or to identify high-value targets for privilege escalation attempts. The vulnerability essentially undermines the principle of least privilege by allowing users to discover the complete user landscape without proper authorization, making it a critical concern for organizations maintaining sensitive data within SAP HANA systems.
Organizations should implement immediate mitigations including strengthening access control policies, reviewing user privilege assignments, and implementing network segmentation to limit the exposure of sensitive endpoints. The recommended approach involves enforcing strict role-based access controls where SpaceAuditor users cannot access user enumeration functions, and implementing monitoring solutions to detect unusual access patterns to user information endpoints. Additionally, organizations should consider disabling unnecessary user enumeration features and ensure that all SAP HANA systems are updated to the latest security patches provided by SAP. This vulnerability aligns with CWE-284, which addresses insufficient access control, and represents a clear violation of the principle of least privilege as outlined in the MITRE ATT&CK framework. The attack vector demonstrates how low-privilege users can leverage application-level flaws to gain unauthorized access to sensitive information, potentially leading to more severe compromise scenarios within the SAP ecosystem.