CVE-2021-27611 in NetWeaver AS ABAP
Summary
by MITRE • 05/11/2021
SAP NetWeaver AS ABAP, versions - 700, 701, 702, 730, 731, allow a high privileged attacker to inject malicious code by executing an ABAP report when the attacker has access to the local SAP system. The attacker could then get access to data, overwrite them, or execute a denial of service.
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Analysis
by VulDB Data Team • 05/15/2021
SAP NetWeaver Application Server ABAP versions 700 through 731 contain a critical code injection vulnerability that enables high-privileged attackers with local system access to execute malicious ABAP code through report execution. This vulnerability represents a significant security risk as it allows attackers to manipulate system behavior and compromise data integrity. The flaw specifically occurs when ABAP reports are executed with elevated privileges, creating an attack vector that can be exploited by adversaries who have already gained local access to the SAP system. The vulnerability falls under CWE-94, which describes improper control of generation of code, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter. The attack requires an attacker to already possess local system access, making it a privilege escalation vulnerability rather than a remote attack vector, but the implications remain severe given that local access often implies administrative privileges within the SAP environment.
The technical implementation of this vulnerability stems from inadequate input validation and code execution mechanisms within the ABAP report processing functionality. When legitimate ABAP reports are executed with sufficient privileges, the system fails to properly sanitize or validate user-supplied parameters that may be passed to internal execution functions. This allows attackers to inject malicious code that gets executed within the context of the SAP system, potentially leading to unauthorized data access, modification, or complete system disruption. The vulnerability is particularly concerning because it leverages the legitimate system functionality to bypass normal security controls, making detection more difficult. Attackers can exploit this weakness to perform data manipulation, extract sensitive information, or execute denial of service attacks that can impact business operations and compromise the integrity of the entire SAP landscape.
The operational impact of CVE-2021-27611 extends beyond immediate data compromise to threaten overall system availability and business continuity. Successful exploitation can result in unauthorized modification of critical business data, complete system outages, and potential regulatory compliance violations. Organizations running affected SAP versions face significant risk exposure since SAP systems typically contain sensitive corporate data, financial information, and business-critical processes. The vulnerability's potential for privilege escalation means that attackers who gain initial local access can leverage this weakness to achieve broader system compromise, potentially moving laterally within the network or accessing additional systems that depend on SAP for operations. This risk is compounded by the fact that SAP systems often serve as central repositories for enterprise data, making successful exploitation particularly damaging to organizational security posture and business operations.
Organizations should immediately implement multiple layers of mitigation strategies to address this vulnerability. The primary recommendation involves applying the relevant SAP security patches and updates that address the code injection flaw in affected versions. Additionally, organizations should implement strict access controls and privilege management to minimize the attack surface, ensuring that local system access is limited to authorized personnel only. Network segmentation and monitoring should be enhanced to detect anomalous ABAP report execution patterns that may indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify any potential unauthorized code execution within SAP environments. System administrators should also implement proper logging and audit trails for ABAP report execution to enable forensic analysis in case of suspected compromise. The mitigation approach should align with security frameworks such as NIST SP 800-53 controls for system and information integrity, ensuring comprehensive protection against both current and potential future exploitation attempts.