CVE-2008-3795 in WS_FTP Home client
Summary
by MITRE
Buffer overflow in Ipswitch WS_FTP Home client allows remote FTP servers to have an unknown impact via a long "message response."
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability identified as CVE-2008-3795 represents a critical buffer overflow flaw within the Ipswitch WS_FTP Home client software that manifests when processing overly long message responses from remote FTP servers. This vulnerability resides in the client-side application's handling of server responses during file transfer operations, specifically when the FTP server sends a response message exceeding the allocated buffer size. The buffer overflow occurs because the client application fails to properly validate the length of incoming response data before copying it into fixed-size memory buffers, creating a condition where maliciously crafted server responses can overwrite adjacent memory locations.
The technical implementation of this vulnerability stems from improper input validation and memory management practices within the WS_FTP Home client's network communication layer. When the client receives a response from an FTP server, it attempts to store this response in a predetermined buffer without adequate bounds checking. This flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which addresses heap-based buffer overflows that occur due to insufficient boundary checks. The vulnerability creates a scenario where an attacker controlling a malicious FTP server can craft a response message that exceeds the buffer capacity, leading to memory corruption that may result in arbitrary code execution or application crash.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it presents significant security risks to users who may unknowingly connect to compromised FTP servers. When exploited, the buffer overflow can potentially allow remote attackers to execute arbitrary code on the victim's system with the privileges of the user running the WS_FTP Home client. This represents a severe compromise of system integrity and confidentiality, as attackers could gain unauthorized access to files, credentials, or system resources. The vulnerability's exploitation capability places it within the ATT&CK framework under the technique T1059.007 for command and scripting interpreter, specifically focusing on application execution through buffer overflow exploitation, and T1190 for exploit for defense evasion.
Mitigation strategies for this vulnerability require immediate patching of the WS_FTP Home client software to address the buffer overflow condition through proper input validation and memory boundary checks. System administrators should implement network segmentation and monitoring to detect suspicious FTP server behavior, particularly when users connect to external servers. Additionally, organizations should consider disabling or restricting the use of vulnerable FTP clients in enterprise environments and implementing network access controls to prevent connections to untrusted FTP servers. The vulnerability serves as a reminder of the importance of secure coding practices, particularly in client applications that process untrusted network input, and demonstrates how seemingly simple input validation failures can result in severe security consequences that may persist across multiple system configurations and user environments.