CVE-2008-3390 in Minishowcase Image Gallery
Summary
by MITRE
Directory traversal vulnerability in libraries/general.init.php in Minishowcase Image Gallery 09b136, when register_globals is enabled, allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the lang parameter.
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Analysis
by VulDB Data Team • 11/02/2024
The vulnerability identified as CVE-2008-3390 represents a critical directory traversal flaw within the Minishowcase Image Gallery application version 09b136. This security weakness specifically targets the libraries/general.init.php file and exploits a fundamental misconfiguration in how the application handles user input when register_globals is enabled. The vulnerability operates through a simple yet dangerous mechanism where attackers can manipulate the lang parameter to navigate directories outside the intended application scope. This flaw falls under the category of CWE-22, which specifically addresses Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal attacks. The attack vector becomes particularly dangerous when the web server has register_globals enabled, a deprecated PHP configuration that automatically creates global variables from request data, significantly amplifying the exploitability of this vulnerability.
The technical implementation of this vulnerability relies on the application's failure to properly sanitize or validate user-supplied input before incorporating it into file inclusion operations. When an attacker crafts a malicious request containing directory traversal sequences such as "../" within the lang parameter, the application processes this input without adequate validation, allowing the attacker to specify arbitrary local file paths. The vulnerability essentially bypasses normal file access controls by leveraging the ../ sequence to move up directory levels, potentially accessing sensitive files such as configuration files, database credentials, or even system files that should remain inaccessible to remote users. This type of attack directly aligns with the ATT&CK technique T1059.007 for Command and Scripting Interpreter: PowerShell, though in this case the exploitation occurs through PHP file inclusion rather than PowerShell execution, making it a classic example of local file inclusion vulnerability that enables arbitrary code execution through strategic path manipulation.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can lead to complete system compromise when combined with other attack vectors or when attackers gain access to sensitive system files. An attacker who successfully exploits this vulnerability can potentially execute arbitrary code on the target system, escalate privileges, or establish persistent backdoors through the inclusion of malicious files. The risk is significantly amplified when the application runs with elevated privileges or when sensitive configuration files containing database credentials or administrative passwords are accessible through the traversal mechanism. This vulnerability demonstrates the critical importance of input validation and the dangers of enabling deprecated PHP configurations such as register_globals, which were explicitly removed in PHP 5.4.0 due to their inherent security risks. The vulnerability affects any system running Minishowcase Image Gallery 09b136 with register_globals enabled, making it particularly dangerous in legacy environments where security updates may not have been applied. Organizations should immediately disable register_globals in their PHP configurations and implement proper input sanitization measures to prevent such attacks from succeeding.
The mitigation strategy for CVE-2008-3390 requires multiple layers of defensive measures to protect against directory traversal attacks. The most immediate and effective solution involves disabling the register_globals directive in the PHP configuration, as this eliminates one of the primary conditions necessary for exploitation. Additionally, developers should implement strict input validation and sanitization for all user-supplied parameters, particularly those used in file inclusion operations. The application should employ a whitelist approach for language parameter values, accepting only predefined and trusted language codes rather than allowing arbitrary input. Security best practices dictate implementing proper path validation that checks for directory traversal sequences and rejects any input containing "../" or similar patterns. Organizations should also consider implementing web application firewalls that can detect and block suspicious path traversal attempts, along with regular security audits to identify similar vulnerabilities in other components of the application stack. The vulnerability serves as a prime example of why defensive programming practices, including input validation, output encoding, and principle of least privilege, are essential components of secure software development lifecycle processes.