CVE-2002-1481 in phpGB
Summary
by MITRE
savesettings.php in phpGB 1.20 and earlier does not require authentication, which allows remote attackers to cause a denial of service or execute arbitrary PHP code by using savesettings.php to modify config.php.
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Analysis
by VulDB Data Team • 09/05/2025
The vulnerability described in CVE-2002-1481 affects phpGB version 1.20 and earlier, specifically targeting the savesettings.php component within the application. This flaw represents a critical security oversight that fundamentally undermines the application's access control mechanisms. The vulnerability exists due to the absence of proper authentication checks within the savesettings.php script, which is designed to modify the application's configuration file. When an attacker accesses this endpoint without proper authorization, they can manipulate the system's configuration parameters, creating a pathway for malicious activity that extends far beyond simple privilege escalation.
This vulnerability directly maps to CWE-284, which addresses improper access control issues within software applications. The technical flaw manifests as a lack of authentication validation that should have been implemented to verify user credentials before allowing modifications to critical system configuration files. The savesettings.php script operates without requiring users to authenticate, making it a prime target for unauthorized access. When an attacker successfully exploits this weakness, they can leverage the script to modify the config.php file, which serves as the central configuration repository for the phpGB application. This modification capability provides attackers with the means to execute arbitrary PHP code, effectively granting them full control over the application's behavior and potentially the underlying server.
The operational impact of this vulnerability is severe and multifaceted, encompassing both denial of service and arbitrary code execution capabilities. Attackers can cause a denial of service by corrupting the configuration file or by introducing malicious code that disrupts normal application functionality. More critically, the ability to execute arbitrary PHP code allows attackers to perform a wide range of malicious activities including data exfiltration, privilege escalation, server compromise, and establishment of persistent backdoors. The vulnerability essentially provides attackers with a direct pathway to compromise the entire application environment, making it particularly dangerous for web applications that handle sensitive data or user information.
From a cybersecurity perspective, this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and execution of malicious code. The attack chain typically begins with reconnaissance to identify the vulnerable phpGB installation, followed by exploitation of the unauthenticated savesettings.php endpoint. The mitigation strategies for this vulnerability are straightforward but critical, requiring immediate implementation of proper authentication mechanisms and access controls. Organizations should implement mandatory user authentication before allowing access to configuration modification endpoints, establish proper input validation and sanitization, and ensure that all administrative functions require verified user credentials. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar authentication bypass issues in other components of the application stack, as this type of flaw often indicates broader security architecture weaknesses that may affect other parts of the system.