CVE-2009-2095 in Mundi Mail
Summary
by MITRE
PHP remote file inclusion vulnerability in template/simpledefault/admin/_masterlayout.php in Mundi Mail 0.8.2, when register_globals is enabled, allows remote attackers to execute arbitrary PHP code via a URL in the top parameter. NOTE: when allow_url_fopen is disabled, directory traversal attacks are possible to include and execute arbitrary local files.
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Analysis
by VulDB Data Team • 12/01/2024
The vulnerability described in CVE-2009-2095 represents a critical remote file inclusion flaw in the Mundi Mail 0.8.2 web application that stems from improper input validation and insecure coding practices. This vulnerability exists within the template/simpledefault/admin/_masterlayout.php file and specifically exploits the dangerous combination of register_globals being enabled and the lack of proper parameter sanitization. The flaw allows remote attackers to inject malicious URLs through the top parameter, creating a pathway for arbitrary code execution on the target system.
The technical nature of this vulnerability aligns with CWE-88, which describes improper neutralization of special elements used in an expression, and CWE-94, which covers execution of arbitrary code through code injection. The vulnerability operates through a classic remote file inclusion attack vector where an attacker can manipulate the top parameter to include external PHP files hosted on remote servers. When register_globals is enabled, PHP automatically creates global variables from GET, POST, and cookie data, which removes the need for explicit variable declarations and creates dangerous conditions for parameter manipulation. This particular implementation flaw demonstrates poor input validation practices and highlights the inherent risks of enabling dangerous PHP configuration options.
The operational impact of this vulnerability is severe and can result in complete system compromise. An attacker who successfully exploits this vulnerability can execute arbitrary PHP code with the privileges of the web server process, potentially leading to data theft, system infiltration, and further lateral movement within the network. The vulnerability's exploitation becomes even more dangerous when considering that it can be combined with directory traversal techniques when allow_url_fopen is disabled, allowing attackers to include and execute local files on the server. This dual exploitation capability significantly increases the attack surface and potential damage scope.
Mitigation strategies for this vulnerability must address both the immediate security flaw and the underlying configuration issues that enable exploitation. Organizations should immediately disable register_globals in their PHP configurations as this setting is inherently dangerous and should never be enabled in production environments. The recommended approach includes implementing proper input validation and sanitization techniques, including the use of allow_url_fopen restrictions and implementing proper parameter validation. Additionally, web application firewalls should be configured to monitor for suspicious URL patterns and parameter manipulation attempts. The principle of least privilege should be enforced by running web applications with minimal required permissions and implementing proper access controls. Regular security audits and code reviews should be conducted to identify similar vulnerabilities, while the application should be updated to versions that address this specific flaw. This vulnerability serves as a reminder of the critical importance of secure coding practices and proper server configuration management in preventing remote code execution attacks.