CVE-2004-1626 in Ability Server
Summary
by MITRE
Buffer overflow in Ability Server 2.34, and possibly other versions, allows remote attackers to execute arbitrary code via a long STOR command.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability identified as CVE-2004-1626 represents a critical buffer overflow flaw affecting Ability Server version 2.34 and potentially other iterations within the product line. This security weakness resides within the server's handling of file transfer commands, specifically the STOR command used in ftp protocol implementations. The buffer overflow occurs when the server processes a maliciously crafted STOR command containing an excessive amount of data that exceeds the allocated buffer space, creating a condition where adjacent memory locations become overwritten with attacker-controlled data.
This vulnerability operates at the application layer of the network stack and presents a significant risk due to its remote exploitability. The flaw stems from inadequate input validation and bounds checking within the Ability Server's ftp implementation, allowing attackers to manipulate memory layout through carefully constructed payloads. When the server receives a long STOR command, it fails to properly validate the length of incoming data against the buffer capacity, leading to memory corruption that can be leveraged to overwrite critical program execution pointers. The vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows memory to be overwritten, and potentially CWE-787, which addresses out-of-bounds write conditions that can result in arbitrary code execution.
The operational impact of this vulnerability extends beyond simple data corruption, as it provides attackers with a pathway to achieve remote code execution on the affected server. Successful exploitation can result in complete system compromise, allowing attackers to gain administrative privileges, install backdoors, or use the compromised server as a launching point for further attacks within the network. The vulnerability affects organizations that rely on Ability Server for file transfer operations, potentially exposing sensitive data and disrupting business continuity. Attackers can leverage this flaw to execute malicious code with the privileges of the Ability Server process, which typically runs with elevated system permissions.
Mitigation strategies for CVE-2004-1626 should prioritize immediate patching of the Ability Server software to the latest available version that addresses the buffer overflow condition. Organizations should implement network segmentation and access controls to limit exposure of the affected server to untrusted networks, utilizing firewall rules to restrict ftp traffic to authorized sources only. Additionally, deploying intrusion detection systems capable of identifying suspicious STOR command patterns and implementing input validation measures can provide defense-in-depth protection. The mitigation approach should also include monitoring for unusual file transfer activities and implementing secure coding practices for ftp server implementations, following standards such as the OWASP Secure Coding Practices and NIST guidelines for buffer overflow prevention. Organizations should consider disabling unnecessary ftp services and implementing alternative secure file transfer protocols such as sftp or ftps to reduce attack surface. The vulnerability demonstrates the importance of regular security updates and proper input validation in preventing remote code execution exploits, highlighting the critical need for maintaining up-to-date security patches across all server applications.