CVE-2018-2494 in NetWeaver
Summary
by MITRE
Necessary authorization checks for an authenticated user, resulting in escalation of privileges, have been fixed in SAP Basis AS ABAP of SAP NetWeaver 700 to 750, from 750 onwards delivered as ABAP Platform.
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Analysis
by VulDB Data Team • 04/20/2020
The vulnerability identified as CVE-2018-2494 represents a critical authorization flaw within SAP Basis AS ABAP components of SAP NetWeaver systems spanning versions 700 through 750. This issue fundamentally undermines the security model by allowing authenticated users to bypass necessary authorization controls, thereby enabling privilege escalation attacks. The vulnerability stems from insufficient validation mechanisms that should have prevented users from accessing resources or performing operations beyond their designated permissions. Such flaws are particularly dangerous in enterprise environments where SAP systems manage critical business processes and sensitive data. The affected systems operate under the assumption that authenticated users possess appropriate authorization levels, creating a dangerous gap in the security architecture that malicious actors can exploit to gain elevated privileges. The vulnerability affects the core authentication and authorization framework of SAP NetWeaver, specifically within the ABAP environment where business logic and data access controls are implemented.
The technical implementation of this vulnerability involves a failure in the authorization checking mechanism that should validate user permissions before granting access to specific system functions or data. This authorization bypass occurs during the processing of user requests where the system fails to properly verify that the authenticated user has the necessary rights to perform the requested operation. The flaw typically manifests when users attempt to access system functions or data that require higher authorization levels than what they possess. According to CWE classification, this vulnerability maps to CWE-284 which describes improper access control, specifically the lack of proper authorization checks in system components. The underlying technical root cause involves insufficient input validation and authorization verification routines within the ABAP runtime environment where user requests are processed and validated against permission sets. This creates a scenario where legitimate authenticated users can perform actions that should be restricted to administrators or users with specific authorization profiles.
The operational impact of CVE-2018-2494 extends far beyond simple privilege escalation, as it fundamentally compromises the integrity of the entire SAP system security model. Attackers exploiting this vulnerability can potentially access sensitive business data, modify critical system configurations, or perform administrative functions that should be restricted to authorized personnel only. The risk is particularly elevated in environments where multiple users share common accounts or where privilege delegation is not properly enforced. Organizations may experience unauthorized data access, system integrity violations, and potential compliance breaches that could result in significant financial and reputational damage. The vulnerability affects the core SAP NetWeaver infrastructure, making it a high-priority concern for enterprise security teams responsible for protecting mission-critical business applications. This flaw enables attackers to move laterally within the SAP ecosystem and potentially compromise other interconnected systems that rely on the same authentication and authorization framework. The impact is further amplified by the fact that many organizations deploy SAP systems across multiple business units and geographical locations, creating widespread potential for exploitation.
Organizations should implement immediate remediation measures including applying the official SAP security patches released for versions 700 through 750 of SAP NetWeaver. The patch addresses the authorization bypass by strengthening the validation checks and ensuring proper permission verification before granting access to system resources. Security teams should also conduct comprehensive authorization reviews and implement additional monitoring controls to detect unauthorized access attempts. According to ATT&CK framework, this vulnerability relates to T1078 which covers valid accounts and T1484 which covers trusted relationship exploitation. Organizations should enhance their privileged access management practices and implement least privilege principles more rigorously. The remediation process requires careful planning to avoid disrupting critical business operations while ensuring all affected systems receive the necessary security updates. Regular security assessments and penetration testing should be conducted to identify similar authorization flaws within the SAP environment and other enterprise systems. Additionally, implementing proper logging and alerting mechanisms around authorization events will help detect potential exploitation attempts and provide valuable forensic data for security incident response activities.