CVE-2019-0337 in NetWeaver Process Integration
Summary
by MITRE
Java Proxy Runtime of SAP NetWeaver Process Integration, versions 7.10, 7.11, 7.30, 7.31, 7.40, 7.50, does not sufficiently encode user-controlled inputs and allows an attacker to execute malicious scripts in the url thereby resulting in Reflected Cross-Site Scripting (XSS) vulnerability
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Analysis
by VulDB Data Team • 11/25/2023
The vulnerability identified as CVE-2019-0337 affects SAP NetWeaver Process Integration versions 7.10 through 7.50, specifically within the Java Proxy Runtime component. This security flaw represents a critical reflected cross-site scripting vulnerability that arises from insufficient input validation and encoding mechanisms within the application's handling of user-controlled data. The vulnerability exists in the way the system processes URL parameters and other input elements that are subsequently rendered in web responses without proper sanitization or encoding.
The technical implementation of this vulnerability stems from the Java Proxy Runtime's failure to adequately encode user-supplied data before incorporating it into web page responses. When malicious input is passed through URL parameters or other web interface elements, the system does not sufficiently sanitize or escape these values before rendering them in HTML contexts. This allows attackers to inject malicious script code that executes in the context of other users' browsers when they view affected pages. The reflected nature of this vulnerability means that the malicious script is reflected off the web server rather than being stored on the server, making it particularly dangerous for web applications that process user input directly in their responses.
The operational impact of this vulnerability is substantial as it enables attackers to perform various malicious activities including session hijacking, credential theft, and redirection to malicious websites. An attacker could craft specially formatted URLs that, when clicked by authenticated users, would execute scripts in their browser context. This could lead to unauthorized access to sensitive business processes, data exfiltration, or the compromise of the entire SAP NetWeaver Process Integration environment. The vulnerability affects organizations using any of the specified versions, making it particularly concerning for enterprises that have not yet upgraded their systems.
Organizations should prioritize immediate remediation through the application of SAP security patches and updates specifically addressing this vulnerability. The recommended mitigation strategy includes implementing proper input validation and output encoding mechanisms at all points where user data enters the application. This aligns with CWE-79 which categorizes cross-site scripting vulnerabilities and follows the principle of defense in depth as outlined in the MITRE ATT&CK framework for web application attacks. Additionally, implementing web application firewalls and content security policies can provide additional protective layers against exploitation attempts. Regular security assessments and code reviews should be conducted to identify and remediate similar encoding vulnerabilities throughout the application stack.