CVE-2002-2054 in Teekai
Summary
by MITRE
TeeKai Forum 1.2 allows remote attackers to authenticate as the administrator and and gain privileged web forum access by setting the valid_level cookie to admin.
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Analysis
by VulDB Data Team • 08/30/2025
The vulnerability described in CVE-2002-2054 represents a critical authentication bypass flaw in TeeKai Forum version 1.2 that directly compromises the security model of the web application. This issue stems from improper session management and privilege validation mechanisms within the forum software, allowing unauthorized users to escalate their privileges through manipulation of client-side cookies. The vulnerability specifically targets the authentication system by exploiting a predictable cookie value that determines user access levels, creating a direct pathway for attackers to assume administrative responsibilities without legitimate credentials.
The technical implementation of this flaw demonstrates a classic case of insecure cookie handling and insufficient server-side validation of user privileges. When the valid_level cookie is set to admin, the application accepts this value without proper verification of the user's actual authorization status or credentials. This represents a fundamental failure in the application's security architecture, where client-side modifications can directly influence server-side access control decisions. The vulnerability aligns with CWE-613, which addresses insufficient session validation, and CWE-287, which covers improper authentication mechanisms. The attack vector operates through a simple cookie manipulation technique that requires minimal technical expertise, making it particularly dangerous as it can be exploited by attackers with basic web security knowledge.
The operational impact of this vulnerability is severe and far-reaching, as it grants full administrative privileges to any remote attacker who discovers the vulnerability. Once authenticated as an administrator, the attacker gains complete control over the forum's content management, user accounts, and system configuration. This includes the ability to delete posts, modify user permissions, access sensitive user data, and potentially use the compromised forum as a staging ground for further attacks against the underlying network infrastructure. The vulnerability also creates a persistent threat vector that remains active as long as the application is deployed with the vulnerable version, allowing for extended periods of unauthorized access and potential data exfiltration.
Mitigation strategies for CVE-2002-2054 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. The most direct solution involves updating to a patched version of TeeKai Forum that implements proper server-side privilege validation and secure session management. Organizations should also implement cookie security measures such as secure flags, HttpOnly attributes, and proper session regeneration after authentication. From an operational security perspective, this vulnerability highlights the importance of input validation and privilege separation, aligning with ATT&CK technique T1548.003 for abuse of privileges and T1078.004 for valid accounts. Network monitoring should be enhanced to detect unusual cookie manipulation patterns, and regular security assessments should be conducted to identify similar authentication bypass opportunities in other web applications. The vulnerability serves as a reminder of the critical importance of server-side validation and the dangers of relying on client-side data for security decisions.