CVE-2005-0520 in FTP Server
Summary
by MITRE
ArGoSoft FTP Server before 1.4.2.8 allows remote attackers to read arbitrary files via shortcut (.LNK) files in the SITE COPY command, a different vulnerability than CVE-2005-0519.
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Analysis
by VulDB Data Team • 07/04/2025
The ArGoSoft FTP Server vulnerability CVE-2005-0520 represents a critical file disclosure flaw that emerged in versions prior to 1.4.2.8. This vulnerability specifically targets the SITE COPY command implementation within the FTP server software, creating a pathway for remote attackers to access sensitive system files through the manipulation of shortcut files with the .LNK extension. The vulnerability operates outside the scope of CVE-2005-0519, indicating a distinct attack vector that leverages the server's handling of symbolic links and file references within its copy functionality. The flaw stems from inadequate input validation and path traversal mechanisms within the server's file system operations.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious .LNK files and submits them through the SITE COPY command to the FTP server. The server processes these shortcut files without proper sanitization, allowing the attacker to traverse the file system and access files that should normally be restricted. This weakness falls under CWE-22, which describes path traversal vulnerabilities, and represents a classic example of insufficient input validation. The vulnerability is particularly dangerous because it allows arbitrary file reading, potentially exposing sensitive information such as configuration files, user credentials, or system binaries that could be used for further exploitation.
Operationally, this vulnerability creates significant risk for organizations relying on ArGoSoft FTP Server versions before 1.4.2.8. Remote attackers can leverage this flaw to gain unauthorized access to system files without requiring authentication or local access. The impact extends beyond simple information disclosure, as attackers might extract configuration details that reveal network topology, user accounts, or other sensitive data that could facilitate additional attacks. The vulnerability affects any system administrator who has not upgraded to the patched version, creating a persistent threat vector that remains active until proper remediation occurs.
Mitigation strategies for CVE-2005-0520 primarily focus on immediate software updates to version 1.4.2.8 or later, which contain the necessary patches to address the path traversal vulnerability in the SITE COPY command. Organizations should also implement network segmentation and access controls to limit exposure, particularly by restricting FTP server access to trusted networks. Additionally, security monitoring should be enhanced to detect suspicious SITE COPY commands and unusual file access patterns. The remediation process should include comprehensive vulnerability scanning to identify systems running vulnerable versions, followed by immediate patch deployment and validation of the fix. This vulnerability demonstrates the importance of maintaining up-to-date software and implementing proper input validation mechanisms to prevent path traversal attacks, aligning with ATT&CK technique T1078 for valid accounts and T1566 for social engineering through file transfer protocols.