CVE-2002-2399 in W3Mail
Summary
by MITRE
Directory traversal vulnerability in viewAttachment.cgi in W3Mail 1.0.6 allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter.
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Analysis
by VulDB Data Team • 08/26/2025
The vulnerability identified as CVE-2002-2399 represents a classic directory traversal flaw within the W3Mail 1.0.6 webmail application's viewAttachment.cgi component. This weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied file parameters before processing file access requests. The vulnerability specifically affects the file parameter handling within the CGI script, where attackers can manipulate the input to navigate through the filesystem hierarchy using the .. (dot dot) sequences that are standard for accessing parent directories in Unix-like and Windows filesystems.
This directory traversal vulnerability maps directly to CWE-22, which categorizes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw allows malicious actors to bypass normal access controls and potentially retrieve sensitive files from the web server's filesystem that should remain protected. The attack vector is particularly dangerous because it operates entirely through HTTP requests, making it accessible to remote attackers without requiring any local system access or authentication credentials. The vulnerability exists due to the absence of proper input sanitization and validation routines that would normally prevent such path manipulation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can potentially lead to complete system compromise if attackers can access critical system files, configuration data, or sensitive user information. In a webmail environment, successful exploitation could result in unauthorized access to user email accounts, personal data, and potentially system credentials stored in configuration files. The vulnerability affects any system running W3Mail 1.0.6 where the viewAttachment.cgi script is accessible, making it particularly concerning for organizations that have not updated their email infrastructure in years. The attack requires minimal technical expertise and can be automated, making it a preferred target for both casual and organized attackers seeking to exploit outdated web applications.
Mitigation strategies for CVE-2002-2399 should focus on immediate patching of the W3Mail application to the latest available version that addresses this vulnerability. Organizations should implement proper input validation and sanitization measures that prevent path traversal attempts by filtering out or escaping special characters like .., /, and \ from user-supplied parameters. The implementation of a secure coding practice that enforces strict file access controls and maintains a whitelist of allowed files for access would significantly reduce the risk. Additionally, system administrators should consider implementing web application firewalls that can detect and block suspicious path traversal patterns in HTTP requests. This vulnerability also highlights the importance of regular security assessments and vulnerability management processes that can identify and remediate outdated software components before they become targets for exploitation. The ATT&CK framework categorizes this as a privilege escalation technique through path traversal, emphasizing the need for robust input validation as a fundamental security control. Organizations should also consider implementing least privilege access controls and regular security updates to prevent similar vulnerabilities from being exploited in other components of their web infrastructure.