CVE-2022-29610 in NetWeaver Application Server ABAP
Summary
by MITRE • 05/11/2022
SAP NetWeaver Application Server ABAP allows an authenticated attacker to upload malicious files and delete (theme) data, which could result in Stored Cross-Site Scripting (XSS) attack.
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Analysis
by VulDB Data Team • 05/13/2022
SAP NetWeaver Application Server ABAP presents a critical security vulnerability that enables authenticated attackers to exploit file upload functionalities and manipulate theme data within the system. This vulnerability resides in the application server's handling of user-uploaded content and theme management operations, creating an attack surface that can be leveraged for persistent cross-site scripting attacks. The flaw specifically affects the server's validation mechanisms for file uploads and theme modifications, allowing malicious actors with legitimate credentials to execute unauthorized operations that compromise the integrity of the application environment. The vulnerability demonstrates a significant weakness in the server's access controls and input sanitization processes, particularly when dealing with user-supplied content that should be strictly regulated and validated.
The technical implementation of this vulnerability stems from insufficient validation and sanitization of file upload parameters within the ABAP environment's theme management capabilities. Attackers can leverage their authenticated access to upload malicious files that contain cross-site scripting payloads, which then get executed when legitimate users interact with the affected theme components. The system's failure to properly validate file types, content, and metadata during the upload process creates a persistent threat vector where malicious code can be stored and executed across multiple user sessions. This flaw operates at the intersection of web application security and enterprise application server security, where the traditional boundaries between user input and system operations become blurred. The vulnerability is particularly concerning because it allows attackers to manipulate theme data, which often serves as a critical interface component for user interaction and system presentation.
The operational impact of this vulnerability extends beyond simple XSS execution, as it provides attackers with a persistent foothold within the SAP NetWeaver environment that can be used for further exploitation and data exfiltration. Once an attacker successfully uploads malicious content, they can establish a persistent cross-site scripting attack that affects all users who interact with the compromised theme components, potentially leading to session hijacking, credential theft, and unauthorized access to sensitive business data. The vulnerability undermines the trust model of the application server, as legitimate users unknowingly execute malicious code that can be used to escalate privileges or access restricted system functionalities. This attack vector represents a significant threat to enterprise security, particularly in environments where SAP NetWeaver serves as a critical business application platform and where users have elevated privileges within the system.
Organizations should implement comprehensive mitigation strategies that include strengthening input validation mechanisms, implementing robust file type restrictions, and enhancing theme management controls within the SAP NetWeaver environment. Security measures should focus on restricting upload capabilities to authenticated users with appropriate authorization levels, implementing content validation for uploaded files, and establishing monitoring procedures for suspicious theme modifications. The mitigation approach should align with industry standards such as CWE-15 for external control of data format and CWE-79 for cross-site scripting vulnerabilities, while also addressing ATT&CK techniques related to privilege escalation and persistence through web application attacks. Regular security assessments and patch management procedures should be implemented to address the root causes of this vulnerability and prevent similar issues from emerging in other components of the SAP ecosystem.