CVE-2020-4879 in Cognos Controller
Summary
by MITRE • 01/21/2022
IBM Cognos Controller 10.4.0, 10.4.1, and 10.4.2 could allow a remote attacker to bypass security restrictions, caused by improper validation of authentication cookies. IBM X-Force ID: 190847.
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Analysis
by VulDB Data Team • 01/27/2022
IBM Cognos Controller versions 10.4.0, 10.4.1, and 10.4.2 contain a critical security vulnerability that allows remote attackers to bypass authentication mechanisms through improper validation of authentication cookies. This vulnerability falls under the CWE-287 category of Improper Authentication, specifically addressing weaknesses in authentication cookie handling and validation processes. The flaw enables unauthorized access to protected resources by exploiting insufficient validation controls that should normally verify the legitimacy and integrity of authentication tokens.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization of authentication cookies within the application's session management framework. When users authenticate to the IBM Cognos Controller system, the application generates authentication cookies that should contain sufficient cryptographic integrity checks and validation mechanisms to prevent unauthorized modification or forgery. However, the vulnerable versions fail to properly validate these cookies, allowing attackers to manipulate or forge authentication tokens that would normally be rejected by proper validation routines.
Attackers can exploit this vulnerability by crafting malicious authentication cookies that bypass the normal authentication flow, potentially gaining access to sensitive financial data, reporting capabilities, and administrative functions within the Cognos Controller environment. The impact extends beyond simple unauthorized access as the vulnerability could enable privilege escalation, data exfiltration, and potentially full system compromise depending on the scope of access granted through the bypassed authentication mechanisms. This vulnerability represents a significant risk to organizations relying on IBM Cognos Controller for financial reporting and business intelligence operations.
The operational impact of this vulnerability is substantial for enterprises using affected IBM Cognos Controller versions, as it directly compromises the security perimeter of financial and business intelligence systems. Organizations may face regulatory compliance issues, data breaches, and potential financial losses due to unauthorized access to sensitive corporate information. The vulnerability's remote exploitability means that attackers can potentially target the system from outside the organization's network without requiring physical access or prior credentials. According to ATT&CK framework, this vulnerability maps to T1078 Valid Accounts and T1566 Phishing techniques, as attackers could leverage the bypassed authentication to maintain persistent access or escalate privileges within the compromised environment.
Organizations should immediately implement mitigations including applying the latest security patches provided by IBM, implementing additional network segmentation controls, and monitoring for suspicious authentication patterns. The recommended approach involves upgrading to IBM Cognos Controller versions that have addressed this vulnerability, typically version 10.4.3 or later, which include proper authentication cookie validation mechanisms. Additional defensive measures such as implementing web application firewalls, strengthening session management policies, and conducting regular security assessments should complement the patching efforts. Security teams should also consider implementing intrusion detection systems to monitor for potential exploitation attempts and establish incident response procedures specifically addressing authentication bypass scenarios.