CVE-2007-5447 in PHP
Summary
by MITRE
ioncube_loader_win_5.2.dll in the ionCube Loader 6.5 extension for PHP 5.2.4 does not follow safe_mode and disable_functions restrictions, which allows context-dependent attackers to bypass intended limitations, as demonstrated by reading arbitrary files via the ioncube_read_file function.
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Analysis
by VulDB Data Team • 10/07/2024
The vulnerability described in CVE-2007-5447 represents a critical security flaw in the ionCube Loader 6.5 extension for PHP 5.2.4 that fundamentally undermines the security model of web applications. This issue affects the ioncube_loader_win_5.2.dll component which is designed to execute encoded PHP scripts but fails to respect core PHP security mechanisms that are intended to protect against unauthorized file access and code execution. The vulnerability specifically targets the safe_mode and disable_functions directives that are standard PHP security features designed to restrict access to sensitive system resources and prevent execution of potentially dangerous functions. When these protections are bypassed, attackers can exploit the ioncube_read_file function to access arbitrary files on the server that would normally be protected by PHP's security restrictions.
The technical flaw in this vulnerability stems from the ionCube Loader's improper implementation of security checks that should normally be enforced by the PHP runtime environment. According to CWE-284, this represents an inadequate access control mechanism where the extension fails to validate access permissions before executing file operations. The vulnerability operates at the level of privilege escalation, allowing attackers to circumvent the intended security boundaries that separate legitimate application execution from unauthorized system access. The ioncube_read_file function, which is typically restricted by PHP's disable_functions directive, becomes a vector for unauthorized file reading when the extension ignores the safe_mode settings that should prevent such operations. This creates a scenario where the security model of the entire PHP application stack is compromised, as the extension essentially becomes a backdoor that bypasses all standard security controls.
The operational impact of this vulnerability is severe and far-reaching for any web application that utilizes the ionCube Loader extension. Attackers can leverage this flaw to read sensitive files such as configuration files, database credentials, user data, and other confidential information that should be protected by PHP's security mechanisms. The context-dependent nature of the attack means that exploitation requires an understanding of the target environment and the specific PHP configuration, but once successfully exploited, the consequences can be devastating. According to ATT&CK framework's T1566.001 technique, this vulnerability enables initial access through exploitation of software vulnerabilities, while the subsequent file reading capabilities align with T1005 data from local systems. The attack vector typically involves manipulating the PHP application to call the ioncube_read_file function in a way that bypasses normal security restrictions, potentially leading to complete system compromise and data exfiltration.
Mitigation strategies for CVE-2007-5447 require immediate action to address the root cause of the vulnerability. Organizations should prioritize updating to a patched version of the ionCube Loader extension that properly implements security restrictions and respects PHP's safe_mode and disable_functions configurations. System administrators must also implement additional monitoring and access controls to detect unauthorized file reading activities that could indicate exploitation attempts. The security community recommends that all PHP applications using ionCube Loader be audited for proper security configuration, with disable_functions directives properly enforced and safe_mode settings correctly implemented. Network segmentation and intrusion detection systems should be configured to monitor for suspicious file access patterns that might indicate exploitation of this vulnerability. Additionally, regular security assessments should verify that the ionCube extension is properly integrated with the overall security posture of the web application infrastructure, ensuring that no bypass mechanisms exist for the fundamental security controls that protect against unauthorized access to system resources.