CVE-2002-0417 in Mailman Webmail
Summary
by MITRE
Directory traversal vulnerability in Endymion MailMan before 3.1 allows remote attackers to read arbitrary files via a .. (dot dot) and a null character in the ALTERNATE_TEMPLATES parameter for various mmstdo*.cgi programs.
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Analysis
by VulDB Data Team • 09/18/2025
The vulnerability identified as CVE-2002-0417 represents a critical directory traversal flaw within Endymion MailMan versions prior to 3.1. This vulnerability specifically affects the ALTERNATE_TEMPLATES parameter within various mmstdo*.cgi programs, creating a pathway for remote attackers to access arbitrary files on the server. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly handle directory traversal sequences, particularly when combined with null characters in the parameter values. The vulnerability operates by exploiting the lack of proper path validation in the web application's template handling functionality, allowing attackers to manipulate file paths and access sensitive system files that should remain protected. This issue falls under the CWE-22 category for Improper Limitation of a Pathname to a Restricted Directory, which is a fundamental security weakness in file system access controls.
The technical exploitation of this vulnerability requires an attacker to craft malicious requests containing directory traversal sequences using the .. (dot dot) notation combined with null characters within the ALTERNATE_TEMPLATES parameter. When the vulnerable mmstdo*.cgi programs process these requests, they fail to properly sanitize the input before using it in file operations, leading to unintended file access. The combination of dot dot sequences with null characters creates a sophisticated attack vector that can bypass standard input validation checks, as the null character effectively terminates string processing in many applications. This particular exploitation technique demonstrates the importance of robust input validation and the dangers of relying solely on basic string filtering mechanisms. The vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachments) as it enables attackers to discover and potentially exfiltrate sensitive files from the target system.
The operational impact of this vulnerability is significant as it provides remote attackers with unauthorized access to potentially sensitive files on the server hosting Endymion MailMan. Attackers could potentially access configuration files, user data, system logs, and other sensitive information that should remain protected within the application's directory structure. The ability to read arbitrary files could lead to credential exposure, system compromise, and data breaches that could affect both the organization and its users. This vulnerability particularly impacts email server environments where the MailMan application handles sensitive communications and user data. Organizations running vulnerable versions of Endymion MailMan are at risk of unauthorized file access, which could result in information disclosure, system integrity compromise, and potential further attack progression. The vulnerability's remote nature makes it particularly dangerous as it does not require physical access or local privileges to exploit, and the attack can be executed from any network location with access to the affected web application.
Mitigation strategies for CVE-2002-0417 should focus on immediate patching of the Endymion MailMan application to version 3.1 or later, which contains the necessary fixes for the directory traversal vulnerability. Organizations should also implement input validation and sanitization measures to prevent malicious sequences from being processed by the application, including proper escaping of special characters and implementing strict path validation. Network-level protections such as web application firewalls and intrusion prevention systems can provide additional layers of defense against exploitation attempts. Security monitoring should be enhanced to detect unusual file access patterns and potential exploitation attempts targeting the affected CGI programs. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other applications and systems. The vulnerability underscores the importance of maintaining up-to-date software versions and implementing comprehensive input validation practices, which are essential controls for preventing directory traversal attacks and other similar vulnerabilities. System administrators should also consider implementing least privilege principles for web application processes and regularly review file access permissions to minimize potential damage from successful exploitation attempts.