CVE-2018-2435 in Netweaver Enterprise Portal
Summary
by MITRE
SAP NetWeaver Enterprise Portal from 7.0 to 7.02, 7.11, 7.20, 7.30, 7.31, 7.40, 7.50, does not sufficiently encode user controlled inputs, resulting in Cross-Site Scripting (XSS) vulnerability.
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Analysis
by VulDB Data Team • 03/02/2020
SAP NetWeaver Enterprise Portal represents a critical web-based platform that serves as a central hub for enterprise portal functionality within SAP environments. This system aggregates various business applications and services into a unified interface, making it a prime target for attackers seeking to exploit web application vulnerabilities. The affected versions spanning from 7.0 through 7.50 contain a fundamental flaw in their input validation mechanisms that directly impacts the platform's security posture. The vulnerability specifically manifests in the portal's handling of user-controlled data within web requests, creating an environment where malicious actors can inject harmful scripts into the application's response. This weakness exists across multiple major releases, indicating a persistent architectural issue that has not been adequately addressed through the software lifecycle.
The technical root cause of this vulnerability stems from insufficient encoding of user inputs within the portal's web interface components. When users submit data through various portal forms, navigation parameters, or URL components, the system fails to properly sanitize or encode these inputs before rendering them in web responses. This inadequate input processing creates XSS attack vectors where attackers can inject malicious JavaScript code into the portal's user interface. The vulnerability is particularly concerning because it affects the core portal functionality, meaning that any user with access to the portal could potentially become a vector for XSS attacks against other users. The flaw operates at the application layer where user interactions are processed and rendered, making it difficult to distinguish between legitimate and malicious input without proper validation and encoding controls. According to CWE standards, this represents a classic CWE-79: Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly encode data before including it in web output.
The operational impact of this vulnerability extends far beyond simple script injection, as it can enable attackers to perform a wide range of malicious activities within the portal environment. An attacker could exploit this vulnerability to steal session cookies, redirect users to malicious websites, deface portal content, or execute unauthorized actions on behalf of legitimate users. The multi-version scope of the vulnerability means that organizations running any of the affected SAP NetWeaver versions are at risk, regardless of their specific implementation or customization levels. This creates a significant challenge for security teams who must assess and remediate the vulnerability across potentially numerous portal instances. The impact is particularly severe in enterprise environments where the portal serves as a central access point for business-critical applications, as successful exploitation could lead to data breaches, unauthorized access to sensitive business information, or disruption of business operations. The vulnerability also aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, demonstrating how attackers can leverage web-based scripting languages to compromise user sessions and execute malicious code within the portal context.
Organizations should implement immediate remediation measures to address this vulnerability, beginning with applying the appropriate SAP security notes and patches released for the affected versions. The recommended mitigation strategy involves implementing proper input validation and output encoding mechanisms throughout the portal's web components, ensuring that all user-controlled data is properly sanitized before being rendered in web responses. Security teams should also consider implementing web application firewalls and content security policies to provide additional layers of protection against XSS attacks. Regular security assessments and penetration testing of portal environments should be conducted to identify potential additional vulnerabilities that may exist in the broader SAP ecosystem. Organizations should also review their user access controls and implement principle of least privilege to minimize the potential impact of successful XSS exploitation. The vulnerability highlights the importance of comprehensive input validation and output encoding practices as fundamental security controls within web applications, particularly in enterprise portal environments where user interaction is a core component of the system's functionality.