CVE-2003-1319 in SmartFTP
Summary
by MITRE
Multiple buffer overflows in SmartFTP 1.0.973, and other versions before 1.0.976, allow remote attackers to execute arbitrary code via (1) a long response to a PWD command, which triggers a stack-based overflow, and (2) a long line in a response to a file LIST command, which triggers a heap-based overflow.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 05/10/2019
The vulnerability identified as CVE-2003-1319 represents a critical security flaw affecting SmartFTP client versions prior to 1.0.976, specifically targeting buffer overflow conditions that enable remote code execution. This vulnerability manifests through two distinct attack vectors that exploit different memory management patterns within the application's FTP client implementation. The first vector involves a stack-based buffer overflow triggered by sending an excessively long response to the PWD (Print Working Directory) command, while the second vector exploits a heap-based buffer overflow through malformed responses to the LIST command for file listings.
The technical implementation of this vulnerability stems from inadequate input validation within the SmartFTP client's FTP protocol handling mechanisms. When processing FTP server responses, the application fails to properly bounds-check the length of data received, particularly in response to directory listing and working directory commands. The stack-based overflow occurs when the PWD command response exceeds the allocated buffer space on the stack, potentially overwriting adjacent memory locations including return addresses and control data. The heap-based overflow manifests when processing file listing responses where the application allocates heap memory without sufficient size validation, allowing attackers to overwrite heap metadata or adjacent allocated blocks.
From an operational perspective, this vulnerability creates a significant threat surface for remote attackers who can leverage these buffer overflows to execute arbitrary code on vulnerable systems. The attack requires minimal privileges since the exploitation occurs within the context of the FTP client application, potentially allowing attackers to gain unauthorized access to systems running vulnerable versions. The impact extends beyond simple code execution to include potential privilege escalation, data compromise, and system takeover scenarios. The vulnerability affects both Windows and Unix-based systems where SmartFTP is installed, making it particularly concerning for enterprise environments with diverse operating system deployments.
The security implications of CVE-2003-1319 align with CWE-121 stack-based buffer overflow (cwe.mitre.org) and CWE-122 heap-based buffer overflow classifications, both of which represent fundamental memory safety issues in software development. According to the MITRE ATT&CK framework, this vulnerability maps to techniques involving code injection and privilege escalation, specifically targeting the execution of malicious code through application-level vulnerabilities. Organizations utilizing SmartFTP clients in production environments face substantial risk exposure, particularly in scenarios where the client operates in networked environments with untrusted FTP servers or when the application is used for automated file transfer operations.
The recommended mitigations for this vulnerability include immediate upgrade to SmartFTP version 1.0.976 or later, which incorporates proper input validation and bounds checking mechanisms. System administrators should also implement network segmentation and firewall rules to limit exposure to potentially malicious FTP servers, while monitoring network traffic for suspicious FTP command sequences. Additionally, organizations should conduct comprehensive vulnerability assessments to identify other potentially affected applications and systems that may be running similar vulnerable code patterns. The remediation process should include disabling unnecessary FTP client functionality and implementing network-based intrusion detection systems to monitor for exploitation attempts targeting these specific buffer overflow conditions.