CVE-2009-2925 in DJcalendar
Summary
by MITRE
Directory traversal vulnerability in DJcalendar.cgi in DJCalendar allows remote attackers to read arbitrary files via a .. (dot dot) in the TEMPLATE parameter.
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Analysis
by VulDB Data Team • 12/04/2024
The vulnerability identified as CVE-2009-2925 represents a classic directory traversal flaw within the DJCalendar web application, specifically affecting the DJcalendar.cgi script. This type of vulnerability falls under the CWE-22 category, which encompasses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability stems from insufficient input validation and sanitization within the TEMPLATE parameter processing mechanism of the DJCalendar application.
The technical exploitation of this vulnerability occurs when a remote attacker crafts a malicious request containing directory traversal sequences such as .. or %2e%2e in the TEMPLATE parameter. When the DJcalendar.cgi script processes this parameter without proper validation, it fails to sanitize the input adequately, allowing the attacker to navigate outside the intended directory structure and access arbitrary files on the server filesystem. This flaw essentially enables attackers to bypass normal access controls and retrieve sensitive information such as configuration files, database credentials, or other confidential data stored on the web server.
The operational impact of CVE-2009-2925 is significant, as it provides attackers with unauthorized access to potentially sensitive data and system information. Depending on the server configuration and file permissions, attackers may be able to read system files, configuration files, or even execute arbitrary code if the application has insufficient security controls. The vulnerability can lead to complete system compromise, data exfiltration, and unauthorized access to administrative functions. This type of attack aligns with ATT&CK technique T1566 which covers credential access through exploitation of vulnerabilities in web applications.
Mitigation strategies for this vulnerability should include immediate input validation and sanitization of all user-supplied parameters, particularly those used for file operations. The application should implement strict path validation that prevents any traversal sequences from being processed, ensuring that all file operations occur within predetermined safe directories. Additionally, implementing proper access controls and least privilege principles for web application processes can limit the damage from successful exploitation. Regular security audits, input validation testing, and keeping web applications updated with security patches are essential defensive measures. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for and prevent exploitation attempts targeting directory traversal vulnerabilities. The vulnerability demonstrates the critical importance of proper input validation and the principle of least privilege in web application security, as outlined in various security frameworks including OWASP Top Ten and NIST cybersecurity guidelines.