CVE-2008-3363 in E-Learning System
Summary
by MITRE
Directory traversal vulnerability in user_portal.php in the Dokeos E-Learning System 1.8.5 on Windows allows remote attackers to include and execute arbitrary local files via a ..\ (dot dot backslash) in the include parameter.
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Analysis
by VulDB Data Team • 11/02/2024
The CVE-2008-3363 vulnerability represents a critical directory traversal flaw in the Dokeos E-Learning System version 1.8.5, specifically affecting Windows environments. This vulnerability resides within the user_portal.php script which fails to properly validate user input before processing file inclusion operations. The flaw enables remote attackers to manipulate the include parameter by inserting ..\ sequences, which allows them to traverse the file system directories and access arbitrary local files on the server. This type of vulnerability falls under the CWE-22 category known as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", which is a fundamental security weakness that has plagued numerous web applications throughout the years.
The technical exploitation of this vulnerability occurs when the application processes user-supplied input without adequate sanitization or validation mechanisms. When a remote attacker crafts a malicious request containing ..\ sequences in the include parameter, the vulnerable Dokeos system interprets these sequences as directory navigation commands rather than legitimate input. This allows the attacker to bypass normal file access controls and potentially access sensitive files such as configuration files, database credentials, or system files that should remain protected. The vulnerability is particularly dangerous on Windows systems where the backslash character is used as a path separator, making the ..\ pattern particularly effective for directory traversal attacks.
The operational impact of this vulnerability extends beyond simple file disclosure, as it can lead to complete system compromise when combined with other attack vectors. An attacker who successfully exploits this vulnerability can execute arbitrary code on the target system, potentially gaining full administrative control over the Dokeos server. This represents a severe privilege escalation opportunity that could result in data breaches, service disruption, or unauthorized access to educational institution resources. The vulnerability affects the core functionality of the learning management system, potentially compromising thousands of users' data and credentials stored within the platform, making it a particularly attractive target for malicious actors in educational environments.
Organizations affected by this vulnerability should implement immediate mitigations including input validation and sanitization of all user-supplied parameters, particularly those used in file inclusion operations. The recommended approach involves implementing strict whitelisting of acceptable file paths and ensuring that all user input is properly escaped or filtered before being processed by the application. Security professionals should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious directory traversal patterns. This vulnerability highlights the importance of following secure coding practices and adhering to the principle of least privilege in web application development, as outlined in various security frameworks including those referenced in the MITRE ATT&CK framework under the techniques related to privilege escalation and command execution through web application vulnerabilities. The Dokeos development team should prioritize updating the vulnerable code to properly validate file paths and implement proper access controls to prevent unauthorized file system access.