CVE-2004-1885 in WS FTP Server
Summary
by MITRE
Ipswitch WS_FTP Server 4.0.2 allows remote authenticated users to execute arbitrary programs as SYSTEM by using the SITE command to modify certain iFtpSvc options that are handled by iftpmgr.exe.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/24/2024
The vulnerability identified as CVE-2004-1885 affects Ipswitch WS_FTP Server version 4.0.2, representing a critical privilege escalation flaw that enables authenticated remote attackers to execute arbitrary code with SYSTEM-level privileges. This vulnerability specifically targets the server's handling of the SITE command, which is typically used for server-specific administrative functions within FTP protocols. The flaw exists in the iFtpSvc service component that is managed by iftpmgr.exe, creating a pathway for malicious actors to manipulate system-level configurations through legitimate administrative interfaces.
The technical implementation of this vulnerability stems from insufficient input validation and privilege separation within the WS_FTP Server's command processing mechanism. When authenticated users submit specific SITE commands, the system fails to properly validate the parameters being passed to the iFtpSvc options, allowing attackers to modify critical service configurations that are normally restricted to system administrators. The iftpmgr.exe process, which serves as the manager for iFtpSvc operations, executes with elevated privileges, making any modifications to its configuration potentially dangerous. This represents a classic case of insufficient privilege checking and command injection vulnerabilities that fall under CWE-264, which addresses permissions, privileges, and access controls.
The operational impact of this vulnerability is severe and far-reaching within affected environments. An authenticated attacker who can establish a connection to the WS_FTP Server can leverage this flaw to execute arbitrary programs with SYSTEM privileges, effectively compromising the entire server infrastructure. This level of access enables attackers to modify system files, install backdoors, exfiltrate sensitive data, and potentially establish persistent access to the network. The vulnerability is particularly dangerous because it requires only authentication credentials, meaning that an attacker who has obtained legitimate user credentials can escalate their privileges without requiring additional exploitation techniques. This aligns with ATT&CK technique T1068, which covers local privilege escalation through service configuration modifications.
Mitigation strategies for this vulnerability should focus on immediate patching of the WS_FTP Server to the latest available version that addresses this specific flaw. Organizations should also implement network segmentation to limit access to FTP services and restrict the number of authenticated users who can connect to the server. Additionally, monitoring for unusual SITE command usage patterns and implementing proper access controls can help detect potential exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date software versions and proper privilege separation in server applications, as outlined in security best practices from NIST SP 800-53 and similar frameworks. Given the age of this vulnerability, organizations should also consider replacing legacy FTP servers with more modern and secure alternatives that have better security track records and more frequent updates.