CVE-2008-2974 in MM Chat
Summary
by MITRE
Directory traversal vulnerability in chatconfig.php in MM Chat 1.5, when register_globals is enabled, allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the currentlang parameter.
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Analysis
by VulDB Data Team • 10/29/2024
The vulnerability described in CVE-2008-2974 represents a critical directory traversal flaw within the MM Chat 1.5 application's chatconfig.php script. This weakness specifically manifests when the PHP configuration option register_globals is enabled, creating an exploitable condition that allows remote attackers to manipulate file inclusion mechanisms. The vulnerability stems from insufficient input validation on the currentlang parameter, which accepts directory traversal sequences such as ../ or ..\ that can navigate outside the intended directory structure. When register_globals is active, PHP automatically creates global variables from GET, POST, and cookie data, effectively bypassing normal input sanitization controls. This creates a dangerous scenario where attacker-controlled data can be directly incorporated into file inclusion operations without proper validation.
The technical exploitation of this vulnerability follows a specific pattern that aligns with common web application attack vectors. Attackers can construct malicious URLs containing directory traversal sequences within the currentlang parameter to access arbitrary local files on the server. For instance, by sending a request with currentlang=../../../etc/passwd, an attacker could potentially read system files that should remain inaccessible. The vulnerability operates at the application layer and specifically targets the file inclusion functionality, making it a classic example of a local file inclusion vulnerability that can be escalated to remote code execution depending on the server configuration and file permissions. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable full system compromise. When combined with the register_globals configuration, the vulnerability allows attackers to execute arbitrary code by including malicious PHP files that may be uploaded to the server or exist within the file system. The attack surface is particularly dangerous because it can be exploited without authentication, making it a high-severity issue for any system running MM Chat 1.5 with register_globals enabled. This vulnerability can lead to complete system compromise, data theft, and potential lateral movement within network environments where the vulnerable application resides. The risk is exacerbated by the fact that register_globals was deprecated in PHP 5.3.0 and removed in PHP 5.4.0, but many legacy systems continued to operate with this dangerous configuration setting.
Mitigation strategies for CVE-2008-2974 require both immediate and long-term approaches to address the underlying configuration and code-level issues. The most critical immediate action involves disabling the register_globals directive in PHP configuration files, which eliminates the primary exploitation vector. Additionally, developers should implement proper input validation and sanitization on all user-supplied parameters, particularly those used in file inclusion operations. The application should employ whitelist-based validation for language parameters, ensuring that only predefined, safe language files can be included. Implementing proper path validation and using functions like realpath() to resolve absolute paths can prevent directory traversal attempts. Organizations should also consider implementing web application firewalls to detect and block suspicious directory traversal patterns. From a security framework perspective, this vulnerability demonstrates the importance of following secure coding practices as outlined in OWASP Top Ten and NIST guidelines, particularly focusing on input validation and secure file handling. The remediation process should include updating to a supported version of MM Chat that addresses this vulnerability, as version 1.5 is outdated and no longer receives security updates. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other legacy applications that may be running with dangerous PHP configurations.