CVE-2004-2446 in 1st Class Mail Server
Summary
by MITRE
Directory traversal vulnerability in 1st Class Mail Server 4.01 allows remote attackers to read arbitrary files via a ".." (dot dot) sequences in unknown vectors.
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Analysis
by VulDB Data Team • 07/19/2017
The directory traversal vulnerability identified as CVE-2004-2446 affects the 1st Class Mail Server version 4.01, presenting a critical security weakness that enables remote attackers to access arbitrary files on the target system. This vulnerability stems from insufficient input validation mechanisms within the mail server's file handling processes, allowing malicious actors to exploit path traversal sequences using double dot notation. The flaw exists in the server's processing of file requests where it fails to properly sanitize user-supplied input containing directory navigation sequences, thereby permitting unauthorized access to files outside the intended directory structure.
The technical implementation of this vulnerability operates through the exploitation of insufficient validation controls that should normally prevent directory traversal attacks. When the mail server processes requests containing ".." sequences, it does not adequately verify or sanitize these path components, allowing the attacker to navigate up the directory hierarchy and access files that should remain restricted. This weakness aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The vulnerability is particularly dangerous because it can be exploited from remote locations without requiring authentication, making it a significant threat vector for attackers seeking to compromise system integrity and confidentiality.
The operational impact of this vulnerability extends beyond simple file access, as it can potentially lead to complete system compromise and data exfiltration. Attackers can leverage this weakness to access sensitive configuration files, user credentials, system logs, and other critical data stored on the mail server. The vulnerability affects the fundamental security model of the mail server by bypassing access controls and file system permissions that should normally protect system resources. This type of attack can result in unauthorized data access, privilege escalation, and potential system infiltration that could serve as a foothold for further attacks within the network infrastructure.
Mitigation strategies for CVE-2004-2446 should prioritize immediate patching of the 1st Class Mail Server to the latest available version that addresses this directory traversal vulnerability. Organizations should implement input validation controls that strictly filter and sanitize all user-supplied data containing path traversal sequences, ensuring that any occurrence of ".." or similar navigation patterns are properly handled or rejected. Network segmentation and firewall rules should be configured to limit access to the mail server to trusted sources only, reducing the attack surface available to potential adversaries. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar weaknesses in other system components, as this vulnerability type is commonly found in legacy applications and systems that have not received proper security updates. The remediation approach should follow established security frameworks and best practices for preventing path traversal attacks, including implementing proper access controls, file system permissions, and input sanitization measures that align with industry standards for secure coding practices.