CVE-2005-1666 in Orenosv Http Ftp Server
Summary
by MITRE
Multiple buffer overflows in Orenosv HTTP/FTP Server 0.8.1 allow remote authenticated users to cause a denial of service (server crash) and possibly execute arbitrary code via long arguments to FTP commands such as MKD, RMD, or DELE, which are processed by the (1) ftp_xlate_path, (2) ftp_is_canonical, or (3) os_fn_nativize functions, or (4) a long SSI command that is processed by the parse_cmd function in cgissi.exe.
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Analysis
by VulDB Data Team • 03/26/2019
The vulnerability identified as CVE-2005-1666 represents a critical security flaw in the Orenosv HTTP/FTP Server version 0.8.1 that exposes multiple buffer overflow conditions affecting the server's core functionality. This vulnerability specifically targets the processing of FTP commands through several internal functions that handle path translation and file operations. The flaw occurs when authenticated remote users submit excessively long arguments to commands such as MKD (make directory), RMD (remove directory), or DELE (delete file), which then get processed by the ftp_xlate_path, ftp_is_canonical, or os_fn_nativize functions. These functions lack proper input validation mechanisms to handle oversized data payloads, creating opportunities for malicious exploitation.
The technical implementation of this vulnerability stems from inadequate bounds checking within the server's FTP command processing pipeline. When the server receives commands with arguments exceeding predetermined buffer sizes, memory corruption occurs at specific memory addresses where the oversized data overflows into adjacent memory segments. The vulnerability affects not only the core FTP functionality but also extends to the server-side includes processing through the cgissi.exe component, where long SSI commands processed by the parse_cmd function create additional attack vectors. This multi-vector approach increases the exploitability of the vulnerability and provides attackers with multiple pathways to achieve their objectives. The buffer overflow conditions manifest as memory corruption that can lead to unpredictable behavior including stack corruption, heap corruption, or memory pointer overwrites that fundamentally compromise the server's operational integrity.
The operational impact of CVE-2005-1666 is severe and multifaceted, creating both immediate denial of service conditions and potential long-term compromise scenarios. Remote authenticated users can trigger server crashes that result in complete service disruption, effectively preventing legitimate users from accessing the FTP services. Beyond simple service interruption, the buffer overflow conditions may enable arbitrary code execution, allowing attackers to gain unauthorized access to the server environment and potentially escalate privileges. The vulnerability affects the server's ability to maintain stable operations and can lead to data loss, unauthorized access to stored files, and potential lateral movement within network environments. The authenticated nature of the attack means that attackers must first establish valid credentials, but this requirement does not significantly reduce the threat level given that many organizations maintain weak credential practices or may have compromised accounts through other means.
Mitigation strategies for this vulnerability require immediate attention and comprehensive implementation across affected systems. The primary remediation involves upgrading to a patched version of the Orenosv HTTP/FTP Server that addresses the buffer overflow conditions through proper input validation and bounds checking mechanisms. Organizations should implement network segmentation and access controls to limit the exposure of vulnerable servers to unauthorized users. Input validation should be strengthened at multiple layers including application-level checks, network-level filtering, and administrative access controls. Security monitoring should be enhanced to detect unusual FTP command patterns and oversized argument submissions that may indicate exploitation attempts. The vulnerability aligns with CWE-121, which describes buffer overflow conditions in stack-based buffers, and relates to ATT&CK technique T1203, which covers exploitation of remote services. System administrators should also consider implementing intrusion detection systems that can identify the specific command patterns associated with this vulnerability, as well as regular security audits to ensure that all instances of the vulnerable software have been properly updated and patched.