CVE-2004-1884 in WS FTP Server
Summary
by MITRE
Ipswitch WS_FTP Server 4.0.2 has a backdoor XXSESS_MGRYY username with a default password, which allows remote attackers to gain access.
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Analysis
by VulDB Data Team • 05/24/2019
The vulnerability identified as CVE-2004-1884 represents a critical security flaw in Ipswitch WS_FTP Server version 4.0.2 that exposes a persistent backdoor mechanism within the software architecture. This backdoor account named XXSESS_MGRYY operates with a hardcoded default password, creating an inherent security weakness that persists across system installations and updates. The presence of such a backdoor fundamentally undermines the authentication security model of the FTP server, as it provides unauthorized access without requiring knowledge of legitimate user credentials or system passwords. This vulnerability exemplifies a design flaw where security considerations were not properly implemented during the development lifecycle, resulting in a permanent access vector that remains exploitable regardless of system hardening efforts.
The technical implementation of this backdoor operates at the application layer of the network stack, specifically within the authentication subsystem of the WS_FTP Server software. When the server processes authentication requests, it does not properly validate or reject the existence of this hardcoded account, allowing any remote attacker who discovers the username and password combination to establish unauthorized sessions. This flaw operates independently of normal authentication mechanisms, making it particularly dangerous as it bypasses all standard security controls and access management policies. The backdoor account functions as a persistent entry point that remains active throughout the server's operational lifecycle, unaffected by user account management or password rotation policies that might otherwise secure the system.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it provides attackers with a stable and reliable method for maintaining persistent access to compromised systems. Once exploited, the backdoor account enables attackers to perform reconnaissance, data exfiltration, privilege escalation, and system compromise activities without detection. The default nature of the credentials means that attackers do not need to perform extensive reconnaissance to discover valid login information, significantly reducing the attack surface and time-to-exploitation. This vulnerability creates a persistent threat vector that can be leveraged for long-term system compromise, potentially enabling attackers to establish command and control capabilities or use the compromised server as a launch point for further attacks within network environments.
Security professionals should recognize this vulnerability as a classic example of insecure default configuration and hardcoded credentials, which aligns with CWE-798 and CWE-259 categories. The presence of default administrative accounts with predictable passwords represents a fundamental security weakness that violates the principle of least privilege and proper access control implementation. From an attack framework perspective, this vulnerability maps to multiple ATT&CK techniques including T1078 for valid accounts and T1046 for network service scanning, as attackers can easily identify and exploit this backdoor without complex attack chains. Organizations should implement immediate mitigation strategies including disabling or removing the backdoor account, implementing network segmentation to limit access to the FTP server, and conducting comprehensive security audits to identify any other hardcoded credentials within the system. Additionally, this vulnerability highlights the importance of proper software supply chain security and the necessity of regularly updating and patching server software to address known vulnerabilities that remain unpatched in legacy systems.