CVE-2019-0243 in BW-4HANA
Summary
by MITRE
Under some circumstances, masterdata maintenance in SAP BW/4HANA (fixed in DW4CORE version 1.0 (SP08)) does not perform necessary authorization checks for an authenticated user, resulting in escalation of privileges.
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Analysis
by VulDB Data Team • 04/26/2020
SAP BW/4HANA contains a critical authorization flaw in its masterdata maintenance functionality that allows authenticated users to escalate their privileges under specific conditions. This vulnerability resides within the authorization checking mechanisms that should normally prevent users from accessing or modifying data beyond their assigned permissions. The issue affects the DW4CORE component version 1.0 and has been addressed in Service Pack 08. The flaw represents a direct violation of the principle of least privilege and undermines the fundamental security architecture of the system.
The technical implementation of this vulnerability stems from insufficient authorization validation during masterdata modification operations. When users perform maintenance tasks on masterdata objects within SAP BW/4HANA, the system should verify that the authenticated user possesses the appropriate authorization objects and permissions required for the specific operation. However, in certain scenarios, these authorization checks fail to execute properly, allowing users to bypass the normal access controls that would typically restrict their actions. This failure occurs specifically during the processing of masterdata maintenance requests where the system's authorization framework does not adequately validate user privileges before permitting data modifications.
The operational impact of this vulnerability is significant as it enables privilege escalation attacks that could allow malicious users to access sensitive business data, modify critical master records, or perform unauthorized operations within the system. An attacker with basic authenticated access could potentially leverage this flaw to gain higher-level privileges, potentially accessing data that should be restricted to specific roles or departments. This vulnerability directly impacts the integrity and confidentiality of business intelligence data, as masterdata often contains sensitive information about business processes, customers, vendors, and other critical operational elements. The affected environment could include financial data, customer information, product catalogs, and other master data that forms the foundation of business intelligence reporting and analysis.
Organizations should implement immediate mitigations including applying the recommended DW4CORE Service Pack 08 update to address the vulnerability. Additionally, security teams should conduct comprehensive authorization reviews to identify and remediate any existing privilege escalation that may have occurred through this vulnerability. The implementation of principle of least privilege should be enforced more rigorously, ensuring that users have only the minimum permissions necessary for their roles. Monitoring and logging of masterdata modification activities should be enhanced to detect any unauthorized access patterns. This vulnerability aligns with CWE-284 which describes improper access control, and represents a specific instance of privilege escalation as categorized in the MITRE ATT&CK framework under the privilege escalation tactic. Organizations should also consider implementing additional security controls such as role-based access control enhancements and regular security assessments to prevent similar authorization bypass scenarios.