CVE-2001-0781 in SpoonFTP
Summary
by MITRE
Buffer overflow in SpoonFTP 1.0.0.12 allows remote attacker to execute arbitrary code via a long argument to the commands (1) CWD or (2) LIST.
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Analysis
by VulDB Data Team • 10/04/2025
The vulnerability identified as CVE-2001-0781 represents a critical buffer overflow flaw in SpoonFTP version 1.0.0.12 that exposes the application to remote code execution attacks. This issue stems from inadequate input validation within the file transfer protocol implementation, specifically affecting two fundamental commands that are commonly used in FTP operations. The vulnerability operates at the application layer and can be exploited by remote attackers without requiring authentication, making it particularly dangerous in networked environments where FTP services are exposed to external traffic.
The technical flaw manifests when an attacker sends a specially crafted argument exceeding the allocated buffer size to either the CWD (Change Working Directory) or LIST (List Directory Contents) commands. These commands are essential components of the File Transfer Protocol specification and are frequently utilized by both legitimate users and automated systems. When the application processes these oversized arguments, the buffer overflow occurs because the software fails to properly validate the length of incoming data before copying it into fixed-size memory buffers. This condition creates a situation where malicious data can overwrite adjacent memory locations, potentially corrupting the program's execution flow and allowing attackers to inject and execute arbitrary code with the privileges of the affected FTP service.
The operational impact of this vulnerability extends beyond simple exploitation, as it can lead to complete system compromise when the FTP service runs with elevated privileges. Attackers can leverage this weakness to gain unauthorized access to the underlying system, potentially escalating privileges to root or administrator levels depending on the service configuration. The vulnerability affects the availability, integrity, and confidentiality of the affected system, as attackers can not only execute code remotely but also potentially exfiltrate sensitive data or establish persistent backdoors. Given that FTP services were widely deployed in the early 2000s when this vulnerability was discovered, the potential attack surface was extensive across both enterprise and consumer environments.
Mitigation strategies for CVE-2001-0781 should prioritize immediate patching of affected SpoonFTP installations, as the vulnerability has been known for over two decades and no longer receives official support or security updates. Organizations should implement network segmentation to limit access to FTP services, deploy intrusion detection systems to monitor for suspicious command sequences, and consider disabling unnecessary FTP functionality where possible. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and maps to ATT&CK technique T1190 for exploitation of remote services. Additionally, implementing input validation controls, using modern FTP implementations with proper memory management, and conducting regular security assessments of network services can help prevent similar vulnerabilities from being exploited in contemporary environments.