CVE-2021-20368 in Cloud Pak for Applications
Summary
by MITRE • 07/13/2021
IBM Cloud Pak for Applications 4.3 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 195357.
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Analysis
by VulDB Data Team • 07/18/2021
The vulnerability identified as CVE-2021-20368 affects IBM Cloud Pak for Applications version 4.3, representing a critical cross-site scripting flaw that compromises the security integrity of the web-based user interface. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as a client-side code injection attack vector that enables malicious actors to execute unauthorized JavaScript code within the context of a victim's browser session. The flaw exists within the application's web user interface rendering mechanisms, allowing attackers to inject malicious scripts through input fields or parameters that are not properly sanitized or validated before being processed and displayed to end users.
The operational impact of this vulnerability extends beyond simple script execution, as it creates a persistent threat vector that can be exploited to hijack user sessions and extract sensitive information. When users interact with the affected web interface, the malicious JavaScript code becomes embedded in the page content and executes within the browser context of authenticated users. This session hijacking capability directly enables credential disclosure attacks where attackers can access session tokens, authentication cookies, and other sensitive data that users have entered or that the application has generated during their authenticated sessions. The vulnerability particularly threatens users who maintain administrative privileges or access to sensitive organizational data, as these sessions often contain elevated privileges and confidential information.
The exploitation of this vulnerability aligns with several techniques documented in the MITRE ATT&CK framework under the T1059.007 sub-technique for "Scripting" and T1531 for "Account Access Removal'. Attackers can leverage this XSS flaw to create persistent backdoors within the application environment, potentially establishing long-term access to the cloud application platform. The IBM X-Force ID 195357 further validates the severity of this issue, indicating that security researchers have classified it as a significant threat requiring immediate attention. Organizations utilizing IBM Cloud Pak for Applications 4.3 should implement immediate mitigations including input validation, output encoding, and Content Security Policy implementations to prevent script injection attacks. The recommended security controls include implementing proper sanitization of all user inputs, employing strict output encoding for dynamic content, and deploying web application firewalls that can detect and block suspicious script injection attempts.
Organizations should also consider implementing additional security measures such as regular security assessments, penetration testing, and vulnerability scanning to identify potential exploitation vectors within their cloud application environments. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing comprehensive security monitoring solutions that can detect anomalous behavior patterns associated with XSS attacks. Regular security training for developers and administrators on secure coding practices, particularly regarding input validation and output encoding, remains essential in preventing similar vulnerabilities from emerging in future releases of the application platform.