CVE-2001-0694 in WFTPD
Summary
by MITRE
Directory traversal vulnerability in WFTPD 3.00 R5 allows a remote attacker to view arbitrary files via a dot dot attack in the CD command.
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Analysis
by VulDB Data Team • 05/18/2019
The vulnerability identified as CVE-2001-0694 represents a critical directory traversal flaw within WFTPD version 3.00 R5, a widely used ftp server implementation that was prevalent during the early 2000s. This weakness stems from insufficient input validation mechanisms within the CD command functionality, which is fundamental to ftp protocol operations for changing directory paths. The vulnerability operates by exploiting the lack of proper path normalization and validation, allowing attackers to manipulate directory navigation commands through the use of dot-dot sequences. When an attacker submits a malicious CD command containing sequences such as ../ or ..\, the ftp server fails to adequately sanitize these inputs, enabling unauthorized access to files outside the intended directory structure.
The technical exploitation of this vulnerability follows a classic directory traversal pattern that aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory. The flaw manifests when the ftp server processes the CD command without properly validating or sanitizing the directory path provided by the client. This allows an attacker to navigate upward through the file system hierarchy, potentially accessing sensitive files such as configuration data, user credentials, system files, or other confidential information that should remain protected from unauthorized access. The vulnerability specifically impacts the authentication and authorization mechanisms of the ftp server, as it bypasses normal file system access controls that would typically prevent such unauthorized file access.
From an operational perspective, this vulnerability presents a severe risk to organizations relying on WFTPD 3.00 R5 for file transfer operations, particularly in environments where ftp services are exposed to untrusted networks or users. The remote nature of the attack means that an attacker can exploit this vulnerability from anywhere on the network without requiring local system access or authentication. The impact extends beyond simple information disclosure, as access to certain files could potentially lead to further exploitation opportunities such as privilege escalation or system compromise. This vulnerability directly relates to ATT&CK technique T1078 which covers valid accounts and T1566 which addresses credential access through exploitation of remote services. Organizations using this vulnerable ftp server implementation face significant exposure to data breaches and unauthorized system access, as the vulnerability can be exploited by automated scanning tools or manual attackers seeking to gain unauthorized access to system resources.
The mitigation strategies for CVE-2001-0694 primarily focus on immediate remediation through software updates and patches provided by the vendor. Organizations should prioritize upgrading to a patched version of WFTPD or migrating to more modern and actively maintained ftp server implementations that properly handle path validation. Network-level mitigations such as firewall rules restricting ftp service access to trusted networks, implementing additional authentication layers, and monitoring for suspicious CD command sequences can provide temporary protection while permanent fixes are implemented. Security configuration reviews should include validating that ftp servers properly sanitize all user inputs, particularly commands that manipulate file system paths. The vulnerability demonstrates the critical importance of input validation in network services and serves as a historical example of how inadequate security controls in legacy software can create persistent exposure windows that remain exploitable for years after initial discovery.