CVE-2021-33678 in NetWeaver AS ABAP
Summary
by MITRE • 07/14/2021
A function module of SAP NetWeaver AS ABAP (Reconciliation Framework), versions - 700, 701, 702, 710, 711, 730, 731, 740, 750, 751, 752, 75A, 75B, 75B, 75C, 75D, 75E, 75F, allows a high privileged attacker to inject code that can be executed by the application. An attacker could thereby delete some critical information and could make the SAP system completely unavailable.
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Analysis
by VulDB Data Team • 01/27/2023
The vulnerability identified as CVE-2021-33678 affects SAP NetWeaver Application Server ABAP reconciliation framework across multiple versions including 700 through 75F, representing a critical security flaw that enables code injection attacks. This vulnerability resides within a function module of the reconciliation framework, which is a core component responsible for processing and validating financial data reconciliation processes. The flaw specifically impacts the system's input validation mechanisms, allowing attackers with high privileged access to inject malicious code that executes within the application context. The vulnerability's classification as high severity stems from its potential to enable complete system compromise and data destruction capabilities.
The technical implementation of this vulnerability involves insufficient input sanitization within the affected function module, creating an environment where malicious payloads can be processed and executed without proper validation. Attackers exploiting this weakness can leverage their elevated privileges to inject code that operates with the same permissions as the application itself, potentially leading to unauthorized data manipulation, deletion of critical system information, and complete system unavailability. The attack vector typically requires an attacker to already possess high-privileged credentials, making this vulnerability particularly dangerous as it can be used to escalate privileges or cause significant operational disruption.
The operational impact of CVE-2021-33678 extends beyond simple code execution to encompass complete system compromise and business continuity threats. When exploited, this vulnerability can result in the deletion of critical financial data, disruption of reconciliation processes, and potential system-wide unavailability that affects core business operations. The affected reconciliation framework is integral to financial processing within SAP systems, meaning that successful exploitation could lead to significant financial losses, regulatory compliance violations, and operational downtime. Organizations relying on these systems for critical financial reconciliation activities face substantial risk when this vulnerability remains unpatched.
Security mitigations for this vulnerability should focus on immediate patch application from SAP, as the vendor has released specific security notes addressing this flaw. Organizations must also implement network segmentation to limit access to privileged accounts and enhance monitoring of system activities for unusual code execution patterns. The vulnerability aligns with CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and can be mapped to ATT&CK techniques such as T1059.001 for command and scripting interpreter execution. Additional defensive measures include implementing privileged access management controls, conducting regular security assessments of ABAP code modules, and establishing robust incident response procedures specifically tailored to address code injection vulnerabilities in enterprise application servers.