CVE-2021-20424 in Cloud Pak for Applications
Summary
by MITRE • 07/13/2021
IBM Cloud Pak for Applications 4.3 could allow a remote attacker to obtain sensitive information when a detailed technical error message is returned in the browser. This information could be used in further attacks against the system. X-Force ID: 196309.
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Analysis
by VulDB Data Team • 07/18/2021
IBM Cloud Pak for Applications version 4.3 contains a vulnerability that exposes sensitive system information through detailed error messages returned to web browsers. This issue represents a classic information disclosure flaw that can significantly aid attackers in their reconnaissance efforts. When the system encounters an error condition, it provides verbose technical details including stack traces, internal system paths, and potentially sensitive configuration information directly in the HTTP response. Such exposure violates fundamental security principles by revealing implementation details that should remain hidden from external actors. The vulnerability falls under the category of improper error handling as defined by CWE-215, which specifically addresses the disclosure of sensitive information through error messages. Attackers can leverage this information to understand the underlying architecture, identify potential attack vectors, and craft more sophisticated attacks against the system. The exposure of internal paths, component names, and technical details creates a significant risk for subsequent exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to perform more targeted reconnaissance activities. When detailed error messages are exposed, threat actors can identify specific software versions, underlying frameworks, and system configurations that may have additional vulnerabilities. This information can be used to map out attack surfaces and identify potential weaknesses in the system's defenses. The vulnerability is particularly concerning in cloud environments where multiple services and components interact, as the error messages may reveal inter-component communication patterns and dependency relationships. From an attacker perspective, this represents a low-effort, high-value information gathering technique that can significantly reduce the time and effort required for subsequent exploitation phases. The exposure of such information aligns with ATT&CK technique T1212, which focuses on exploitation of information disclosure vulnerabilities to gain intelligence about the target system.
Mitigation strategies for this vulnerability should focus on implementing proper error handling mechanisms that sanitize all error responses before they are transmitted to clients. Organizations should configure their applications to return generic error messages to end users while logging detailed technical information internally for administrative purposes. This approach aligns with security best practices outlined in the OWASP Top Ten and follows the principle of least privilege in error reporting. The implementation of centralized error handling components can help ensure consistent error message formatting across all application modules. Additionally, organizations should review their logging configurations to ensure that sensitive information is not inadvertently exposed in log files or monitoring systems. Regular security testing should include validation of error message handling to ensure that no sensitive information is exposed during normal operation or error conditions. Network-level protections such as web application firewalls can also help filter out potentially harmful error message patterns, though the primary defense should remain in application-level error handling. The vulnerability demonstrates the critical importance of proper error management in security-conscious applications and highlights the need for comprehensive security testing throughout the software development lifecycle.