CVE-2018-2497 in HANA
Summary
by MITRE
The security audit log of SAP HANA, versions 1.0 and 2.0, does not log SELECT events if these events are part of a statement with the syntax CREATE TABLE <table_name> AS SELECT.
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Analysis
by VulDB Data Team • 04/20/2020
The vulnerability identified as CVE-2018-2497 affects SAP HANA database systems in versions 1.0 and 2.0, specifically targeting the security audit logging mechanism. This flaw represents a significant gap in the system's ability to track database activities, as it fails to record SELECT operations that occur within the context of CREATE TABLE AS SELECT statements. The security audit log serves as a critical control mechanism for monitoring database access and ensuring compliance with security policies. When SELECT operations are embedded within CREATE TABLE AS SELECT statements, the system's audit trail becomes incomplete, creating blind spots in security monitoring and forensic analysis capabilities. This issue directly impacts the integrity of security logging and can compromise the organization's ability to detect unauthorized access or data exfiltration attempts.
The technical root cause of this vulnerability lies in the improper handling of audit logging within the SAP HANA database engine when processing specific SQL statement constructs. The CREATE TABLE AS SELECT syntax combines two distinct operations - table creation and data selection - yet the system's audit mechanism only logs the table creation component while omitting the SELECT component. This selective logging behavior creates a scenario where security analysts cannot accurately correlate database activities or trace the complete execution path of complex SQL operations. The flaw demonstrates a failure in the audit logging subsystem's ability to properly parse and record nested SQL operations, particularly when they involve data retrieval components within data definition statements. According to CWE-778, this vulnerability falls under insufficient logging categories, specifically related to incomplete audit logging of database operations, which can lead to security monitoring gaps.
The operational impact of this vulnerability extends beyond simple logging gaps and creates substantial risks for organizations relying on SAP HANA for mission-critical applications. Security teams lose visibility into data access patterns when SELECT operations occur within CREATE TABLE AS SELECT statements, potentially masking unauthorized data access or privilege escalation attempts. This vulnerability can be particularly dangerous in environments where data governance and compliance requirements mandate comprehensive audit trails, as it creates gaps that may violate regulatory standards such as SOX, HIPAA, or GDPR. The incomplete logging can also complicate forensic investigations following security incidents, making it difficult to establish complete timelines of events or identify the full scope of potential data exposure. Attackers could potentially exploit this weakness by embedding malicious SELECT operations within CREATE TABLE AS SELECT statements to avoid detection while accessing sensitive data.
Organizations should implement multiple mitigation strategies to address this vulnerability effectively. Immediate remediation involves applying the official SAP security patches released for this vulnerability, which typically include enhanced audit logging mechanisms that properly capture SELECT operations within CREATE TABLE AS SELECT statements. System administrators should also consider implementing additional monitoring solutions that can cross-reference database activities with other log sources to identify potential gaps in audit logging. Configuration changes may include enabling more comprehensive logging settings within SAP HANA, though these should be carefully evaluated to ensure they do not introduce performance degradation. The vulnerability aligns with ATT&CK technique T1070.001, which involves the use of application logs to hide malicious activities, making it particularly concerning for organizations that rely on audit logs for threat detection. Regular security assessments and penetration testing should be conducted to verify that the patched systems properly log all database activities, including those that previously exhibited this logging gap.