CVE-2004-2672 in FTP Server
Summary
by MITRE
Unspecified vulnerability in ArGoSoft FTP server before 1.4.2.2 allows attackers to upload .lnk files via unknown vectors.
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Analysis
by VulDB Data Team • 07/01/2021
The vulnerability identified as CVE-2004-2672 represents a critical security flaw in the ArGoSoft FTP server software prior to version 1.4.2.2. This unspecified weakness creates a significant attack surface that enables malicious actors to exploit the system through the unauthorized upload of .lnk files, which are Windows shortcut files typically used for creating links to applications or documents. The vulnerability stems from inadequate input validation and file type filtering mechanisms within the FTP server implementation, allowing attackers to bypass normal security controls that should prevent the upload of potentially malicious file types.
The technical nature of this vulnerability aligns with CWE-434, which describes the weakness of allowing untrusted data to be uploaded or imported into a system without proper validation or sanitization. The ArGoSoft FTP server fails to properly validate file extensions or content types during the upload process, creating an opportunity for attackers to leverage the .lnk file format to execute malicious code or perform privilege escalation attacks. These shortcut files can contain embedded commands or references to external resources that, when executed by a victim system, could lead to unauthorized access or system compromise. The attack vector operates through the FTP protocol itself, where legitimate users might upload files for legitimate purposes, but attackers exploit this functionality to introduce malicious payloads.
The operational impact of this vulnerability extends beyond simple file upload capabilities, as .lnk files can be crafted to execute arbitrary commands when opened by Windows systems. This creates a potential for privilege escalation attacks, where an attacker who gains write access to the FTP server can upload malicious files that, when executed by other users or system processes, could lead to complete system compromise. The vulnerability also aligns with ATT&CK technique T1197, which involves the use of shortcut modification for persistence or privilege escalation. Attackers can leverage this weakness to create persistent backdoors or establish footholds within networks where the FTP server is deployed, particularly in environments where users might unknowingly execute these malicious shortcut files.
Security professionals should implement multiple layers of defense to mitigate this vulnerability, including immediate patching of the ArGoSoft FTP server to version 1.4.2.2 or later, which addresses the insufficient input validation issues. Network segmentation and firewall rules should be configured to restrict FTP server access to authorized users only, while implementing strict file type filtering that blocks .lnk files and other potentially dangerous file extensions. Additionally, monitoring systems should be enhanced to detect unusual file upload patterns or attempts to upload executable or script files through FTP protocols. The remediation process should also include user education about the risks of executing unknown files, particularly those obtained through file transfer protocols, as this vulnerability can be exploited through social engineering or automated attacks that target the FTP server directly. Organizations should also consider implementing network-based intrusion detection systems that can identify and alert on suspicious FTP traffic patterns that might indicate exploitation attempts.