CVE-2006-2171 in WarFTPD
Summary
by MITRE
Buffer overflow in WDM.exe in WarFTPD allows remote attackers to execute arbitrary code via unspecified arguments, as demonstrated by the Infigo FTPStress Fuzzer.
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Analysis
by VulDB Data Team • 07/25/2018
The vulnerability identified as CVE-2006-2171 represents a critical buffer overflow flaw within the WDM.exe component of WarFTPD, a Windows-based FTP server implementation. This security weakness resides in the handling of unspecified arguments passed to the WDM.exe process, which serves as a core component of the WarFTPD service architecture. The vulnerability was specifically demonstrated through exploitation using the Infigo FTPStress Fuzzer, highlighting the potential for remote code execution when malicious input is processed by the affected software. The buffer overflow occurs during argument parsing operations where insufficient bounds checking allows attackers to overwrite adjacent memory locations, potentially leading to arbitrary code execution with the privileges of the affected service.
The technical exploitation of this vulnerability follows established patterns for buffer overflow attacks within network services, where attacker-controlled input exceeds the allocated buffer space and corrupts adjacent memory regions. This flaw falls under the Common Weakness Enumeration category CWE-121, which specifically addresses stack-based buffer overflow conditions, and more broadly relates to CWE-787, representing out-of-bounds write vulnerabilities. The attack vector leverages the service's failure to validate input lengths and boundaries during argument processing, creating opportunities for memory corruption that can be manipulated to redirect program execution flow. The Infigo FTPStress Fuzzer demonstrates how automated tools can identify and exploit such vulnerabilities by systematically testing various input lengths and patterns against the FTP service interface.
Operationally, this vulnerability presents significant risk to systems running WarFTPD, as remote attackers can leverage the buffer overflow to execute malicious code on the target system. The implications extend beyond simple privilege escalation, as successful exploitation can lead to complete system compromise, data exfiltration, and potential lateral movement within network environments. The vulnerability affects systems where WarFTPD is deployed as an FTP server, particularly those exposed to untrusted network traffic or lacking proper network segmentation. Organizations utilizing this particular FTP implementation face heightened risk due to the remote attack surface and the potential for automated exploitation through fuzzer tools that can rapidly identify and exploit such memory corruption vulnerabilities. The impact is particularly severe given that the vulnerability allows for arbitrary code execution, which can be leveraged to establish persistent access or deploy additional malicious payloads.
Mitigation strategies for CVE-2006-2171 should prioritize immediate patching of affected WarFTPD installations, as this represents a critical security flaw requiring urgent attention. Organizations should implement network segmentation to limit exposure of FTP services to untrusted networks and consider deploying network-based intrusion detection systems to monitor for exploitation attempts. The implementation of input validation controls and address space layout randomization can provide additional defense-in-depth measures. Security teams should also conduct thorough vulnerability assessments to identify all instances of WarFTPD deployment within their environments and ensure proper access controls are implemented to limit potential attack vectors. Additionally, monitoring for suspicious FTP activity and implementing automated patch management processes can help reduce the window of exposure while maintaining operational continuity. The vulnerability serves as a reminder of the importance of regular security assessments and the need for robust input validation mechanisms in network services, particularly those handling untrusted user input.