CVE-2021-21489 : Exploit Details and Defense Strategies

SAP NetWeaver Enterprise Portal versions 7.10, 7.11, 7.20, 7.30, 7.31, 7.40, and 7.50 are vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient encoding of user-related data, potentially leading to the compromise of portal content integrity.

Understanding CVE-2021-21489

This CVE pertains to a security vulnerability in SAP NetWeaver Enterprise Portal versions. The vulnerability allows an attacker with administrative privileges to execute a malicious script on the portal, which could be triggered by a registered portal user, resulting in confidentiality and integrity risks.

What is CVE-2021-21489?

CVE-2021-21489 relates to Stored Cross-Site Scripting (XSS) vulnerability in SAP NetWeaver Enterprise Portal versions 7.10 to 7.50. The issue arises from inadequate encoding of user data, enabling the storage of malicious scripts that could compromise portal content.

The Impact of CVE-2021-21489

The vulnerability poses a medium-level threat, with a CVSS base score of 4.8. While the confidentiality and integrity impacts are low, an attacker with high privileges can exploit the flaw to launch XSS attacks, potentially affecting the portal's users and data.

Technical Details of CVE-2021-21489

The vulnerability description, affected systems, and exploitation mechanism are crucial factors to understand the implications of CVE-2021-21489.

Vulnerability Description

SAP NetWeaver Enterprise Portal versions 7.10 to 7.50 fail to adequately encode user-related data, exposing them to Stored Cross-Site Scripting (XSS) threats. Attackers can store and execute malicious scripts, endangering portal content confidentiality and integrity.

Affected Systems and Versions

The versions impacted include SAP NetWeaver Enterprise Portal versions 7.10, 7.11, 7.20, 7.30, 7.31, 7.40, and 7.50. Users operating on these versions are at risk of exploitation if adequate security measures are not implemented.

Exploitation Mechanism

With administrative privileges, an attacker can upload and execute malicious scripts within the portal. Subsequently, when a registered user interacts with the malicious content, it could trigger XSS attacks, potentially leading to data breaches.

Mitigation and Prevention

Taking immediate action is imperative to mitigate the risks associated with CVE-2021-21489. Implementing security measures, following best practices, and applying necessary patches are key to safeguarding your systems.

Immediate Steps to Take

Organizations using the affected SAP NetWeaver Enterprise Portal versions should update to patched versions promptly. Conduct security assessments and monitor portal activities for suspicious behavior to prevent unauthorized access.

Long-Term Security Practices

Enforce secure coding practices, conduct regular security audits, and educate users about safe portal usage to mitigate XSS vulnerabilities. Implement strict access controls and continuously monitor and update your portal's security features.

Patching and Updates

Stay informed about security advisories from SAP SE and promptly apply patches released to address vulnerabilities. Regularly update your SAP NetWeaver Enterprise Portal to ensure protection against emerging threats.