CVE-2019-4177 in Cognos Controller
Summary
by MITRE
IBM Cognos Controller 10.2.0, 10.2.1, 10.3.0, 10.3.1, and 10.4.0 allows web pages to be stored locally which can be read by another user on the system. IBM X-Force ID: 158882.
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Analysis
by VulDB Data Team • 10/05/2023
IBM Cognos Controller versions 10.2.0 through 10.4.0 contain a critical security flaw that enables unauthorized local file access through improper handling of web page storage mechanisms. This vulnerability falls under the category of insecure data storage and privilege escalation, creating a significant risk for multi-user environments where system isolation is expected. The flaw allows malicious actors to exploit local storage mechanisms to read files that should remain confidential, effectively bypassing access controls that are typically enforced at the application level. This issue directly relates to CWE-200, which addresses information exposure, and CWE-250, which covers execution with unnecessary privileges. The vulnerability stems from insufficient validation of file access permissions within the web application's local storage implementation, where web pages and associated data are cached or stored in a manner that does not properly isolate user contexts. Attackers can leverage this weakness to access sensitive data that should be restricted to specific user sessions or roles, potentially leading to information disclosure and unauthorized data access across different user accounts on the same system. The operational impact of this vulnerability extends beyond simple data theft, as it can enable further attacks including privilege escalation, lateral movement, and comprehensive system compromise when combined with other vulnerabilities. IBM X-Force ID 158882 confirms the severity of this issue within the broader security landscape, particularly affecting enterprise environments where Cognos Controller is deployed for financial reporting and business intelligence purposes. The flaw is particularly dangerous in shared or multi-tenant environments where multiple users access the same system, as it undermines the fundamental security principle of user isolation and data protection. This vulnerability aligns with ATT&CK technique T1074.001, which covers data staging through local data staging, and T1005, which involves data from local system storage. The attack surface is particularly wide given that Cognos Controller is commonly used in financial and enterprise settings where sensitive business data is processed and stored, making the potential impact of this vulnerability substantial. Organizations utilizing these affected versions should immediately implement mitigations including access control hardening, file system permission reviews, and application-level security configuration updates.
The technical exploitation of this vulnerability requires minimal prerequisites and can be achieved through standard web application attack vectors. The flaw manifests when the application stores web content locally without proper user context separation, allowing one authenticated user to access the stored content of another user session. This occurs because the local storage mechanism does not adequately implement session isolation or access control checks that would normally be enforced in web applications. The vulnerability is particularly concerning because it operates at the file system level, bypassing typical application-level security controls and authentication mechanisms. Security researchers have identified that this issue is not limited to specific data types but affects all content that gets stored locally by the application, including reports, configuration data, and potentially sensitive user information. The implementation of proper access controls and file system permissions becomes critical in mitigating this vulnerability, as the flaw essentially creates a backdoor for unauthorized data access through the local storage subsystem. Organizations should consider implementing additional security controls such as file system encryption, regular access control audits, and monitoring for unauthorized file access patterns. The vulnerability demonstrates a fundamental flaw in the application's security architecture where the separation between user contexts is not properly enforced at the storage layer, creating a persistent risk that remains active as long as the affected application versions are deployed.
Organizations affected by this vulnerability should prioritize immediate remediation efforts through official IBM patches and updates, while implementing additional defensive measures to reduce the potential impact. The security implications extend beyond simple data access, as this vulnerability can enable attackers to gather intelligence about other users, potentially facilitating more sophisticated attacks including credential theft and privilege escalation. System administrators should conduct comprehensive audits of local storage directories and implement strict file system permissions to prevent unauthorized access to stored web content. The vulnerability also highlights the importance of proper security configuration management and regular vulnerability assessments to identify similar flaws in other enterprise applications. Organizations should consider implementing network segmentation and access controls to limit the potential damage from such vulnerabilities, particularly in environments where multiple users share common system resources. The remediation process should include not only applying the vendor patches but also conducting thorough security reviews of the application's local storage mechanisms to ensure no similar issues exist in other components. Additionally, implementing proper logging and monitoring for file access patterns can help detect exploitation attempts and provide forensic evidence for security incident response. The vulnerability serves as a reminder of the critical importance of secure coding practices and proper access control implementation, particularly in enterprise applications that handle sensitive business data and require robust security controls to maintain data integrity and confidentiality.