CVE-2007-0790 in SmartFTP
Summary
by MITRE
Heap-based buffer overflow in SmartFTP 2.0.1002 allows remote FTP servers to execute arbitrary code via a large banner.
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Analysis
by VulDB Data Team • 08/22/2024
The vulnerability identified as CVE-2007-0790 represents a critical heap-based buffer overflow flaw in SmartFTP client version 2.0.1002 that enables remote exploitation through malicious FTP server responses. This issue specifically targets the application's handling of server banners during the initial connection process, where the client fails to properly validate the length of incoming data before copying it into a fixed-size heap buffer. The vulnerability resides in the client's network communication processing module, which directly impacts how the application interprets and stores information from remote FTP servers during the initial handshake phase.
The technical exploitation of this vulnerability occurs when a malicious FTP server responds with an oversized banner message that exceeds the allocated buffer size in SmartFTP's memory allocation. When the client attempts to store this excessive data, it overflows the heap buffer and potentially corrupts adjacent memory regions, including return addresses and function pointers. This memory corruption can be leveraged by remote attackers to inject and execute arbitrary code with the privileges of the affected user running SmartFTP. The vulnerability is particularly dangerous because it requires no user interaction beyond establishing a connection to the malicious server, making it a classic remote code execution vector that aligns with attack patterns documented in the attack tree framework.
From an operational impact perspective, this vulnerability creates significant risk for users who rely on SmartFTP for file transfers, as attackers can compromise systems simply by hosting a malicious FTP server. The heap overflow allows for potential privilege escalation and persistent access to victim machines, making it a preferred target for attackers seeking to establish backdoors or perform reconnaissance activities. The vulnerability affects the confidentiality, integrity, and availability of the affected systems, as successful exploitation can lead to complete system compromise. Organizations using this specific version of SmartFTP face elevated risk during routine file transfer operations, particularly when connecting to untrusted or compromised FTP servers.
The vulnerability maps directly to CWE-121, which describes heap-based buffer overflow conditions, and aligns with several attack techniques documented in the MITRE ATT&CK framework under initial access and execution phases. Mitigation strategies should include immediate patching of SmartFTP to version 2.0.1003 or later, which contains the necessary memory validation fixes. Network administrators should implement firewall rules to restrict FTP traffic to trusted servers, employ network segmentation to limit exposure, and consider using alternative FTP clients that have been verified as free from similar vulnerabilities. Additionally, users should be educated about the risks of connecting to untrusted FTP servers and the importance of keeping software updated. The remediation process should also include monitoring for suspicious network activity and implementing intrusion detection systems that can identify potential exploitation attempts targeting this specific vulnerability pattern.