CVE-2009-1936 in cpCommerce
Summary
by MITRE
_functions.php in cpCommerce 1.2.x, possibly including 1.2.9, sends a redirect but does not exit when it is called directly, which allows remote attackers to bypass a protection mechanism to conduct remote file inclusion and directory traversal attacks, execute arbitrary PHP code, or read arbitrary files via the GLOBALS[prefix] parameter, a different vector than CVE-2003-1500.
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Analysis
by VulDB Data Team • 01/21/2025
The vulnerability identified as CVE-2009-1936 affects cpCommerce version 1.2.x, including the specific 1.2.9 release, and represents a critical security flaw in the application's input validation and access control mechanisms. This issue resides within the _functions.php file which serves as a core component for the commerce platform's functionality. The flaw manifests when the script is invoked directly rather than through the intended application flow, creating an exploitable condition that undermines the system's security controls. The vulnerability specifically targets the GLOBALS[prefix] parameter, which is processed without proper validation, allowing attackers to manipulate the application's behavior through crafted input sequences.
The technical implementation of this vulnerability stems from a fundamental flaw in the application's execution flow management. When _functions.php is called directly, it processes the GLOBALS[prefix] parameter and executes a redirect operation without properly terminating the script execution. This design flaw creates a path where the application continues processing subsequent code even after initiating a redirect, effectively bypassing intended security checks and access controls. The absence of proper exit() or die() statements after redirect operations allows the script to continue executing, enabling attackers to chain additional malicious operations. This behavior aligns with CWE-88, which describes improper neutralization of special elements used in an OS command, and represents a form of improper control flow management that can lead to code execution vulnerabilities.
The operational impact of this vulnerability extends beyond simple bypass mechanisms and enables sophisticated attack vectors including remote file inclusion attacks, directory traversal exploits, and arbitrary PHP code execution. Attackers can leverage this flaw to inject malicious code into the application environment, potentially gaining full control over the affected server or database. The vulnerability's ability to read arbitrary files through the GLOBALS[prefix] parameter creates additional risks for information disclosure, allowing attackers to access sensitive configuration files, user data, or system information. This weakness can be exploited to escalate privileges and establish persistent access within the compromised environment, making it particularly dangerous for web applications handling sensitive commerce data.
The attack surface for this vulnerability is particularly concerning given that it operates through a parameter that is commonly used in web application frameworks for prefix management and database table handling. The fact that this vulnerability operates through a different vector than CVE-2003-1500 indicates that while similar in nature, it represents a distinct exploitation path that requires separate mitigation strategies. Security professionals should note that this flaw demonstrates poor input sanitization practices and inadequate script termination protocols that are commonly observed in legacy web applications. The vulnerability's exploitation requires minimal privileges and can be automated, making it attractive to both automated scanners and targeted attackers. Organizations should consider implementing the ATT&CK technique T1059.007 for PowerShell and T1059.006 for Command and Scripting Interpreter as defensive measures, though these may need adaptation for PHP-specific environments.
Mitigation strategies for CVE-2009-1936 should focus on immediate code-level fixes including implementing proper script termination after redirect operations and validating all input parameters before processing. The application should be modified to ensure that _functions.php cannot be executed directly without proper authentication and authorization checks. Organizations should implement input validation that prevents manipulation of the GLOBALS[prefix] parameter and ensure that all redirect operations are immediately followed by script termination. Additionally, comprehensive security audits should be conducted to identify similar patterns in other application components that may exhibit the same improper control flow behavior. The vulnerability highlights the importance of proper application architecture design and input validation practices, emphasizing the need for defensive programming techniques that prevent code execution flows from continuing after redirect operations. Regular security updates and patch management processes should be implemented to prevent such issues from remaining unaddressed in production environments.