CVE-2008-4452 in vxFtpSrv
Summary
by MITRE
Buffer overflow in Cambridge Computer Corporation vxFtpSrv 2.0.3 allows remote attackers to cause a denial of service (crash and hang) and possibly execute arbitrary code via a long CWD request.
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Analysis
by VulDB Data Team • 11/05/2024
The vulnerability identified as CVE-2008-4452 represents a critical buffer overflow flaw within the vxFtpSrv 2.0.3 FTP server implementation developed by Cambridge Computer Corporation. This security weakness manifests when the server processes a specially crafted CWD (Change Working Directory) command that exceeds the allocated buffer size, creating an exploitable condition that can be leveraged by remote attackers to compromise system integrity. The vulnerability resides in the protocol handling mechanism where insufficient input validation and boundary checking allows malicious data to overwrite adjacent memory regions, potentially leading to unpredictable system behavior.
The technical exploitation of this buffer overflow vulnerability follows a well-established pattern that aligns with CWE-121, which categorizes buffer overflow conditions as a fundamental weakness in software design. When a remote attacker sends a malformed CWD command containing excessive data, the server's memory management routines fail to properly constrain the input length, causing the overflow to overwrite critical program variables, return addresses, or stack frames. This condition can result in immediate system crashes, creating a denial of service scenario that effectively prevents legitimate users from accessing the FTP service. The vulnerability's potential for arbitrary code execution stems from the ability to manipulate the program's execution flow through stack corruption, enabling attackers to inject and execute malicious instructions within the server's memory space.
From an operational perspective, this vulnerability presents significant risks to organizations relying on the vxFtpSrv 2.0.3 implementation, particularly in environments where FTP services are exposed to untrusted networks or public internet access. The remote attack vector eliminates the need for physical access or local privileges, making it an attractive target for automated exploitation campaigns. The impact extends beyond simple service disruption, as successful exploitation could allow attackers to gain unauthorized access to sensitive data, escalate privileges, or establish persistent backdoors within the affected system. The vulnerability's classification under ATT&CK technique T1210, which covers exploitation of remote services, highlights its relevance to modern cyber threat landscapes where adversaries increasingly target networked services for initial access and lateral movement.
Organizations should implement immediate mitigations including applying vendor patches or upgrading to newer versions of the vxFtpSrv software that address the buffer overflow conditions. Network segmentation and firewall rules should be configured to restrict access to FTP services, limiting exposure to trusted internal networks only. Additionally, implementing intrusion detection systems and monitoring for unusual CWD command patterns can help identify potential exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other network services, as buffer overflow vulnerabilities often indicate broader software design weaknesses that may affect other components of the system infrastructure. The remediation approach should also include comprehensive testing of patched versions to ensure that the vulnerability is fully resolved without introducing regressions in service functionality.