CVE-2006-5472 in PHPLibrary
Summary
by MITRE
PHP remote file inclusion vulnerability in Softerra PHP Developer Library 1.5.3 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the lib_dir parameter in (1) lib/registry.lib.php, (2) lib/sqlcompose.lib.php, and (3) lib/sqlsearch.lib.php.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5472 represents a critical remote file inclusion flaw within the Softerra PHP Developer Library version 1.5.3 and earlier releases. This issue stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before incorporating it into PHP include statements. The vulnerability specifically affects three core library files including registry.lib.php, sqlcompose.lib.php, and sqlsearch.lib.php, all of which accept a lib_dir parameter that can be manipulated by remote attackers to inject malicious URLs.
The technical implementation of this vulnerability occurs when the application processes user input through the lib_dir parameter without proper validation or sanitization. When a malicious actor supplies a URL as the value for lib_dir, the PHP application's include function processes this input directly, effectively allowing the remote execution of arbitrary PHP code from external sources. This type of vulnerability falls under the CWE-98 category of Improper Input Validation, specifically manifesting as a remote file inclusion attack that operates at the application layer of the OSI model. The flaw demonstrates a classic lack of proper parameter sanitization and input filtering that enables attackers to bypass normal application security controls.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete remote code execution capabilities on the affected system. Once exploited, adversaries can execute arbitrary commands with the privileges of the web application, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability affects the entire Softerra PHP Developer Library ecosystem, making any application utilizing these specific library files susceptible to attack. From an attack framework perspective, this vulnerability aligns with ATT&CK technique T1190 for Exploit Public-Facing Application, representing a common attack vector used by threat actors targeting web applications. The remote nature of the exploit means that attackers can leverage this vulnerability from any location without requiring physical access to the target system.
Mitigation strategies for CVE-2006-5472 should prioritize immediate patching of the Softerra PHP Developer Library to versions that address the input validation issues. Organizations should implement proper input sanitization measures that validate and filter all user-supplied parameters before processing, particularly those used in include or require statements. The implementation of a whitelist-based approach for parameter validation can prevent malicious URLs from being processed, while also enabling the application to maintain its intended functionality. Additionally, organizations should consider implementing web application firewalls that can detect and block suspicious URL patterns in request parameters. The remediation process should also include disabling remote file inclusion features in PHP configuration and implementing proper access controls to limit the impact of potential exploitation attempts. Security monitoring should be enhanced to detect unusual patterns of file inclusion requests that may indicate exploitation attempts, while also ensuring that all applications are regularly updated to address known vulnerabilities.