CVE-2009-1592 in 32bit FTP
Summary
by MITRE
Stack-based buffer overflow in ElectraSoft 32bit FTP 09.04.24 allows remote FTP servers to execute arbitrary code via a long banner. NOTE: this might overlap CVE-2003-1368.
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Analysis
by VulDB Data Team • 11/28/2024
The vulnerability identified as CVE-2009-1592 represents a critical stack-based buffer overflow flaw within ElectraSoft 32bit FTP version 09.04.24. This security defect manifests when the affected FTP client processes a maliciously crafted banner message from a remote FTP server, creating an exploitable condition that could lead to arbitrary code execution. The vulnerability specifically occurs during the handling of banner strings, where the client fails to properly validate the length of incoming data before copying it into a fixed-size stack buffer.
The technical implementation of this flaw follows the classic stack buffer overflow pattern where insufficient input validation allows an attacker to overwrite adjacent memory locations on the stack. When a remote FTP server sends a banner message containing more data than the allocated buffer space, the excess data overflows into adjacent stack memory, potentially corrupting return addresses, function pointers, or other critical control data. This overflow condition creates a predictable memory corruption scenario that attackers can leverage to inject and execute malicious code within the context of the vulnerable FTP client process.
From an operational impact perspective, this vulnerability presents a significant risk to organizations relying on ElectraSoft 32bit FTP clients for file transfer operations. Remote attackers can exploit this weakness without requiring authentication or prior access to the target system, making it particularly dangerous in networked environments where FTP services are commonly exposed to external threats. The successful exploitation could result in complete system compromise, allowing attackers to execute arbitrary commands, escalate privileges, or establish persistent access to affected systems. The vulnerability's potential overlap with CVE-2003-1368 suggests this may represent a previously identified flaw that was not properly addressed in the specific version affected by CVE-2009-1592, indicating a possible regression or incomplete remediation.
The attack vector for this vulnerability aligns with the ATT&CK framework's technique T1210 - Exploitation of Remote Services, where adversaries target network services to gain unauthorized access. The vulnerability falls under CWE-121 - Stack-based Buffer Overflow, which is categorized as a fundamental memory safety issue in software development practices. Organizations should implement immediate mitigations including updating to patched versions of the ElectraSoft FTP client, applying network segmentation to limit exposure to untrusted FTP servers, and implementing intrusion detection systems to monitor for suspicious banner content. Additionally, network administrators should consider disabling unnecessary FTP services and implementing proper input validation controls at network boundaries to prevent exploitation attempts. The vulnerability demonstrates the importance of proper bounds checking in network protocol implementations and highlights the need for regular security updates to address known memory corruption flaws in widely deployed client applications.