CVE-2000-1230 in Phorum
Summary
by MITRE
Backdoor in auth.php3 in Phorum 3.0.7 allows remote attackers to access restricted web pages via an HTTP request with the PHP_AUTH_USER parameter set to "boogieman".
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Analysis
by VulDB Data Team • 01/11/2025
The vulnerability described in CVE-2000-1230 represents a critical backdoor mechanism within the Phorum 3.0.7 web forum software that fundamentally undermines the authentication security model. This flaw exists in the auth.php3 file where the application fails to properly validate user credentials, creating an unauthorized access pathway that bypasses normal authentication procedures. The vulnerability is particularly concerning as it allows remote attackers to gain access to restricted web pages simply by manipulating a single HTTP parameter, making it an easily exploitable backdoor that could enable full administrative access to the forum system.
The technical implementation of this backdoor operates through a hardcoded credential check within the authentication logic where the application specifically accepts the username "boogieman" as a valid credential without proper verification against the system's actual user database or password storage mechanisms. This pattern of hardcoded credentials violates fundamental security principles and represents a classic example of a backdoor vulnerability that has been documented in various security frameworks including CWE-254 which addresses weak credentials and CWE-798 which covers hardcoded credentials in source code. The flaw demonstrates a failure in input validation and authentication mechanisms that directly relates to the MITRE ATT&CK framework's credential access tactics, specifically covering techniques related to valid accounts and default credentials.
The operational impact of this vulnerability extends far beyond simple unauthorized access as it provides attackers with complete control over the affected forum system. Once exploited, an attacker can manipulate forum content, delete messages, create new users, and potentially use the compromised system as a launching point for further attacks against other systems within the network. The remote nature of the exploit means that attackers do not require physical access to the server or any local network credentials, making the vulnerability particularly dangerous for organizations that host public-facing web forums. This type of vulnerability would typically be classified under the attack pattern of privilege escalation and could lead to complete system compromise if the forum server has access to sensitive data or is part of a larger network infrastructure.
Mitigation strategies for this vulnerability must include immediate patching of the affected Phorum installation to version 3.0.8 or later, which contains the necessary authentication fixes. Organizations should also implement network-level restrictions to limit access to forum administrative interfaces, deploy web application firewalls to detect and block suspicious HTTP parameter patterns, and conduct comprehensive security audits of all web applications to identify similar hardcoded credential vulnerabilities. The incident highlights the importance of proper authentication design and the critical need for thorough code reviews to prevent such backdoor implementations. Additionally, system administrators should implement monitoring for unusual authentication patterns and establish robust incident response procedures to address potential exploitation attempts. This vulnerability serves as a stark reminder of how a single hardcoded credential can compromise entire systems and underscores the necessity of following secure coding practices that prevent backdoor implementations in web applications.