CVE-2009-3422 in PaoLiber
Summary
by MITRE
login.php in Zenas PaoLiber 1.1, when register_globals is enabled, allows remote attackers to bypass authentication and gain administrative access by setting the login_ok parameter to 1.
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Analysis
by VulDB Data Team • 12/07/2024
The vulnerability identified as CVE-2009-3422 affects Zenas PaoLiber 1.1, a web application that suffers from a critical authentication bypass flaw when the PHP configuration parameter register_globals is enabled. This vulnerability resides within the login.php script and represents a classic example of insecure direct object reference and improper input validation. The flaw stems from the application's reliance on global variables without proper sanitization or validation, creating an exploitable condition that directly undermines the application's security controls. When register_globals is enabled, PHP automatically creates global variables from request parameters, which can be manipulated by attackers to manipulate application logic and bypass authentication mechanisms.
The technical exploitation of this vulnerability occurs through the manipulation of the login_ok parameter within the application's authentication flow. Attackers can simply set this parameter to the value 1 in their HTTP requests to bypass the normal authentication process and gain administrative privileges. This represents a fundamental flaw in the application's security architecture where input validation and parameter handling are insufficient to prevent unauthorized access. The vulnerability is particularly dangerous because it leverages a PHP configuration setting that was commonly enabled in older web server environments, making the attack surface wider than initially apparent.
From an operational perspective, this vulnerability allows remote attackers to completely bypass the application's authentication system and assume administrative roles without proper credentials. The impact extends beyond simple unauthorized access as administrative privileges typically grant full control over the application's functionality, including user management, data modification, and potentially system-level operations. This vulnerability directly violates the principle of least privilege and represents a critical failure in the application's access control mechanisms. The attack requires no special privileges or complex exploitation techniques, making it highly dangerous and easily reproducible by threat actors with basic web application knowledge.
The vulnerability aligns with CWE-284 (Improper Access Control) and CWE-862 (Missing Authorization) categories, which specifically address failures in authorization and access control mechanisms. It also maps to ATT&CK technique T1078 (Valid Accounts) and T1566 (Phishing) as attackers can leverage this vulnerability to gain legitimate administrative access to the system. The flaw demonstrates poor secure coding practices and highlights the dangers of relying on PHP configuration settings that automatically create global variables from user input. Organizations should immediately disable register_globals in their PHP configurations and implement proper input validation, parameter sanitization, and authentication controls to prevent such vulnerabilities from being exploited. The recommended mitigations include disabling the vulnerable PHP configuration, implementing proper authentication mechanisms, and conducting comprehensive security reviews of all application components to identify and remediate similar issues.