CVE-2021-37535 in NetWeaver Application Server Java
Summary
by MITRE • 09/14/2021
SAP NetWeaver Application Server Java (JMS Connector Service) - versions 7.11, 7.20, 7.30, 7.31, 7.40, 7.50, does not perform necessary authorization checks for user privileges.
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Analysis
by VulDB Data Team • 09/17/2021
SAP NetWeaver Application Server Java contains a critical authorization bypass vulnerability in its JMS Connector Service component that affects multiple versions including 7.11, 7.20, 7.30, 7.31, 7.40, and 7.50. This vulnerability stems from insufficient validation of user privileges within the messaging infrastructure, creating a pathway for unauthorized access to sensitive system resources. The flaw exists in the service's design where proper access control mechanisms fail to verify whether authenticated users possess the necessary permissions to perform specific operations within the JMS connector functionality. This represents a fundamental breakdown in the principle of least privilege enforcement that is critical for maintaining system integrity and data confidentiality.
The technical implementation of this vulnerability allows malicious actors to exploit the missing authorization checks by leveraging their existing authentication credentials to perform actions they should not be permitted to execute. Attackers can potentially access, modify, or delete sensitive data through the JMS messaging channels without proper authorization validation. The vulnerability specifically impacts the JMS Connector Service which facilitates communication between SAP systems and external messaging systems, making it a prime target for attackers seeking to compromise enterprise messaging infrastructure. This flaw enables privilege escalation scenarios where users with minimal permissions could gain access to administrative functions or sensitive data processing capabilities.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can lead to complete system compromise through lateral movement within the enterprise network. Attackers could leverage this vulnerability to intercept sensitive communications, manipulate message queues, or gain access to critical business data flowing through the SAP environment. The affected versions represent a significant portion of SAP NetWeaver installations, making this vulnerability particularly dangerous as it affects organizations across multiple business sectors. The lack of proper authorization enforcement creates a persistent risk that remains active until patched, potentially allowing attackers to maintain long-term access to compromised systems.
Organizations should prioritize immediate patching of affected systems to address this vulnerability, as it aligns with common attack patterns documented in the MITRE ATT&CK framework under privilege escalation and defense evasion techniques. The vulnerability maps to CWE-284 which specifically addresses improper access control in software systems. Security teams should implement additional monitoring controls around JMS connector activities and user access patterns to detect potential exploitation attempts. Network segmentation strategies should be reinforced to limit lateral movement capabilities, while regular access reviews should be conducted to ensure proper privilege allocation. Organizations should also consider implementing additional authentication layers and multi-factor authentication mechanisms to reduce the impact of credential compromise in case of successful exploitation attempts.