CVE-2000-0565 in SmartFTP Daemon
Summary
by MITRE
SmartFTP Daemon 0.2 allows a local user to access arbitrary files by uploading and specifying an alternate user configuration file via a .. (dot dot) attack.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 05/19/2019
The vulnerability identified as CVE-2000-0565 affects SmartFTP Daemon version 0.2, a file transfer protocol server implementation that presents a significant security weakness through improper file path validation mechanisms. This flaw enables local attackers to bypass normal access controls and gain unauthorized access to system files through a carefully crafted file upload operation that exploits directory traversal techniques. The vulnerability stems from the daemon's failure to properly sanitize user-supplied file paths during configuration file processing, creating an opportunity for malicious actors to manipulate the file system navigation logic.
The technical exploitation of this vulnerability relies on the classic directory traversal attack pattern where an attacker uploads a specially crafted configuration file containing path traversal sequences such as ".." to navigate outside the intended directory boundaries. When the SmartFTP Daemon processes this malicious configuration file, it fails to validate the path components properly, allowing the attacker to reference files outside the designated configuration directory. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal vulnerabilities. The implementation flaw occurs at the file system access layer where input validation is insufficient to prevent malicious path manipulation.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it provides attackers with the ability to read sensitive system files, configuration data, and potentially execute arbitrary code if the daemon has sufficient privileges. Local users who can upload files to the system can leverage this vulnerability to escalate their privileges and access restricted resources that should normally be protected from unauthorized access. The attack vector requires local system access and the ability to upload files, making it particularly concerning for systems where local privileges are not strictly controlled. This vulnerability aligns with ATT&CK technique T1059.001, which covers command and script interpreter execution, as the compromised system may allow for further exploitation through command execution capabilities.
Mitigation strategies for this vulnerability involve implementing proper input validation and sanitization of all user-supplied file paths, particularly during configuration file processing operations. System administrators should ensure that the SmartFTP Daemon is updated to a patched version that properly validates file paths and prevents directory traversal attacks. The recommended approach includes implementing strict path validation that rejects any path components containing ".." sequences or other traversal indicators, combined with proper access control mechanisms that limit file system access to only intended directories. Additionally, privilege separation techniques should be employed to ensure that the FTP daemon operates with minimal required privileges, reducing the potential impact of successful exploitation. Organizations should also implement monitoring and logging of file upload activities to detect suspicious patterns that may indicate attempted exploitation of similar vulnerabilities.