CVE-2004-0695 in WebSTAR
Summary
by MITRE
Stack-based buffer overflow in the FTP service for 4D WebSTAR 5.3.2 and earlier allows remote attackers to execute arbitrary code via a long FTP command.
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Analysis
by VulDB Data Team • 01/27/2025
The vulnerability identified as CVE-2004-0695 represents a critical stack-based buffer overflow flaw within the File Transfer Protocol service of 4D WebSTAR version 5.3.2 and earlier. This issue arises from inadequate input validation mechanisms within the FTP command processing functionality, specifically when handling user-supplied data. The flaw exists in the software's handling of command strings that exceed predetermined buffer limits, creating a condition where maliciously crafted input can overwrite adjacent memory locations on the stack. Such buffer overflow conditions are particularly dangerous as they can be exploited to overwrite return addresses, function pointers, or other critical program state information, thereby allowing attackers to redirect program execution flow.
The technical implementation of this vulnerability stems from improper bounds checking during FTP command processing within the WebSTAR server application. When a remote attacker sends an overly long FTP command to the vulnerable service, the application fails to validate the length of the incoming data against the allocated buffer space. This lack of input sanitization creates an exploitable condition where the excess data overflows into adjacent stack memory regions. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which is a well-documented weakness in software development practices involving insufficient validation of input data length. The flaw demonstrates poor defensive programming principles where the application assumes that input data will always conform to expected parameters without proper validation mechanisms.
The operational impact of this vulnerability extends far beyond simple service disruption, as it provides remote attackers with the capability to execute arbitrary code on the affected system with the privileges of the WebSTAR service account. This remote code execution capability enables attackers to gain full control over the affected server, potentially leading to complete system compromise, data exfiltration, or use as a pivot point for further attacks within the network infrastructure. The attack vector requires only a network connection to the vulnerable FTP service, making it particularly attractive to threat actors seeking low-effort, high-impact exploitation opportunities. The vulnerability affects organizations running legacy versions of 4D WebSTAR software, which may be present in various enterprise environments where older web server solutions have not been properly updated or replaced.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The primary and most effective solution involves upgrading to a patched version of 4D WebSTAR that addresses the buffer overflow condition through proper input validation and bounds checking mechanisms. Organizations should also implement network segmentation and access controls to limit exposure of the vulnerable FTP service to untrusted networks. Additionally, deploying intrusion detection systems and monitoring for anomalous FTP command patterns can help detect potential exploitation attempts. The remediation process should follow established security practices including comprehensive testing of patches in controlled environments before deployment, along with maintaining detailed system baselines to detect any unauthorized modifications. This vulnerability underscores the importance of regular security updates and proper software lifecycle management practices that prevent the continued operation of unpatched systems vulnerable to known exploitation techniques. The flaw serves as a reminder of the critical nature of input validation in preventing buffer overflow exploits and aligns with ATT&CK technique T1203 for exploitation of remote services through buffer overflow vulnerabilities.