CVE-2018-2470 in NetWeaver Application Server for ABAP
Summary
by MITRE
In SAP NetWeaver Application Server for ABAP, from 7.0 to 7.02, 7.30, 7.31, 7.40 and from 7.50 to 7.53, applications do not sufficiently encode user-controlled inputs, resulting in Cross-Site Scripting (XSS) vulnerability.
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Analysis
by VulDB Data Team • 04/01/2020
The vulnerability identified as CVE-2018-2470 affects SAP NetWeaver Application Server for ABAP across multiple versions including 7.0 to 7.02, 7.30, 7.31, 7.40, and 7.50 to 7.53. This represents a critical security flaw that resides in the server's input validation mechanisms, specifically within how the system handles user-controlled data. The vulnerability manifests as a cross-site scripting issue that occurs when applications fail to properly encode or sanitize user inputs before rendering them in web responses. This flaw allows malicious actors to inject malicious scripts into web pages viewed by other users, creating a persistent security risk that can affect the integrity and confidentiality of user data. The vulnerability's impact extends across all affected versions of the SAP NetWeaver platform, indicating a widespread issue that affects organizations utilizing these specific server releases.
The technical root cause of this vulnerability stems from insufficient input validation and output encoding practices within the SAP NetWeaver ABAP application server. When user-supplied data enters the system through various input points such as forms, URL parameters, or API endpoints, the server fails to adequately sanitize this data before it is processed and rendered in web interfaces. This inadequate sanitization creates an environment where malicious scripts can be injected and subsequently executed in the context of other users' browsers. The vulnerability is classified as a classic XSS flaw where the system does not properly distinguish between legitimate content and potentially harmful script code. According to CWE standards, this corresponds to CWE-79 which specifically addresses Cross-Site Scripting vulnerabilities due to insufficient output encoding. The flaw operates by allowing attackers to inject script code that gets executed in the victim's browser, potentially leading to session hijacking, data theft, or redirection to malicious sites.
The operational impact of CVE-2018-2470 extends far beyond simple script injection, creating significant risks for organizations relying on SAP NetWeaver systems. Attackers exploiting this vulnerability can gain unauthorized access to user sessions, potentially stealing sensitive corporate data, credentials, or confidential business information. The persistent nature of XSS vulnerabilities means that once a malicious script is injected, it can affect all users who view the compromised page, creating a cascading security risk. Organizations may experience data breaches, compliance violations, and potential regulatory penalties due to the exposure of sensitive information. The vulnerability also enables attackers to perform actions on behalf of users, potentially leading to unauthorized transactions or modifications within the SAP environment. This risk is particularly severe in enterprise settings where SAP systems handle critical business processes and sensitive data. From an ATT&CK framework perspective, this vulnerability maps to techniques involving code injection and credential access, with potential for lateral movement within the network once initial compromise is achieved.
Mitigation strategies for CVE-2018-2470 should prioritize immediate patching of affected SAP NetWeaver versions through official SAP security updates. Organizations must ensure they apply the relevant security patches provided by SAP to address the input validation and output encoding deficiencies. Additionally, implementing comprehensive input validation controls can help prevent malicious data from entering the system, while output encoding mechanisms should be strengthened to ensure all user-supplied content is properly sanitized before presentation. Network segmentation and web application firewalls can provide additional layers of protection, though these measures should complement rather than replace proper patching. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of similar issues within the SAP environment. Organizations should also implement user education programs to raise awareness about XSS threats and establish monitoring procedures to detect suspicious activities. The implementation of content security policies and proper HTTP headers can further reduce the impact of potential XSS attacks, while maintaining proper access controls and authentication mechanisms ensures that even if scripting occurs, unauthorized access remains limited.