CVE-2005-0696 in FTP Server
Summary
by MITRE
Buffer overflow in ArGoSoft FTP Server 1.4.2.8 allows remote authenticated users to execute arbitrary code via a long DELE command. NOTE: this issue was later reported to also affect 1.4.3.5.
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Analysis
by VulDB Data Team • 07/04/2025
The vulnerability identified as CVE-2005-0696 represents a critical buffer overflow flaw within the ArGoSoft FTP Server version 1.4.2.8 and subsequently confirmed to impact version 1.4.3.5. This security weakness stems from inadequate input validation mechanisms within the server's implementation of the DELE command, which is used to delete files from the FTP server's file system. The flaw occurs when an authenticated user sends a specially crafted DELE command containing an excessive amount of data that exceeds the allocated buffer space, leading to memory corruption that can be exploited to execute arbitrary code on the affected system.
The technical nature of this vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The ArGoSoft FTP Server fails to properly validate the length of the argument provided to the DELE command, creating a classic stack-based buffer overflow scenario. When the server processes the malicious DELE command, the excessive input overflows the designated buffer, potentially overwriting the return address on the stack or other critical program variables. This memory corruption can be manipulated by attackers to redirect program execution flow and inject malicious code that executes with the privileges of the FTP server process.
From an operational perspective, this vulnerability poses significant risks to organizations relying on ArGoSoft FTP Server implementations. The requirement for authentication means that only legitimate users with valid credentials can exploit this flaw, but this does not diminish the severity of the threat. An attacker with access to legitimate FTP accounts can leverage this vulnerability to gain unauthorized code execution capabilities, potentially leading to complete system compromise. The remote execution aspect of the vulnerability allows attackers to exploit the flaw from outside the network perimeter, making it particularly dangerous for systems with public FTP services. The impact extends beyond immediate code execution to potential privilege escalation, data exfiltration, and use as a foothold for further network infiltration activities.
Organizations should implement immediate mitigations including applying the vendor-provided patches that address this buffer overflow vulnerability, as well as considering network segmentation and access controls to limit FTP service exposure. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, highlighting the importance of maintaining up-to-date software and implementing proper access controls. Additionally, network monitoring should be enhanced to detect unusual patterns in FTP command usage, particularly with long parameter strings that may indicate exploitation attempts. Regular vulnerability assessments and penetration testing should be conducted to identify similar buffer overflow vulnerabilities in other network services and applications. System hardening practices including disabling unnecessary FTP features, implementing strong authentication mechanisms, and maintaining comprehensive audit logs are essential defensive measures that complement the patching efforts to reduce the attack surface and improve overall security posture.