CVE-2003-1260 in CuteFTP
Summary
by MITRE
Buffer overflow in CuteFTP 5.0 allows remote attackers to execute arbitrary code via a long response to a LIST command.
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Analysis
by VulDB Data Team • 02/25/2025
The vulnerability identified as CVE-2003-1260 represents a critical buffer overflow flaw within CuteFTP version 5.0, a widely used file transfer client software. This vulnerability specifically manifests when the application processes a malformed LIST command response from a remote FTP server, creating a condition where an attacker can manipulate the software's memory handling behavior. The buffer overflow occurs during the parsing of directory listing responses, which are standard components of FTP protocol communication and typically contain information about files and directories on remote servers. The flaw exists in the client-side implementation where the software fails to properly validate the length of incoming data before copying it into fixed-size memory buffers, creating an exploitable condition that can be triggered through network-based attacks.
The technical nature of this vulnerability places it squarely within the CWE-121 category of stack-based buffer overflow conditions, where insufficient bounds checking allows attackers to overwrite adjacent memory locations. In the context of CuteFTP 5.0, when a malicious FTP server responds to a LIST command with an excessively long response string, the application's internal buffer handling mechanism cannot accommodate the data size, leading to memory corruption that can be leveraged for code execution. This type of vulnerability aligns with ATT&CK technique T1059.007, which describes the execution of malicious code through command injection mechanisms, particularly in client applications that process untrusted network data. The buffer overflow creates a scenario where attacker-controlled data can overwrite return addresses, function pointers, or other critical memory structures, potentially enabling arbitrary code execution with the privileges of the affected user.
The operational impact of CVE-2003-1260 extends beyond simple remote code execution, as it represents a fundamental security weakness in client-side FTP applications that were widely deployed across enterprise and personal computing environments. Organizations utilizing CuteFTP 5.0 were exposed to potential compromise through network-based attacks where malicious FTP servers could be configured to send oversized LIST responses designed to trigger the buffer overflow. The vulnerability's remote exploitability means that attackers need only establish a connection to a vulnerable client and send a specially crafted response to achieve their goals, making it particularly dangerous for systems that automatically connect to untrusted FTP servers or when users browse directories on potentially malicious FTP servers. The exploitation process typically involves crafting a malicious response that exceeds the buffer capacity, causing a stack overflow that can be manipulated to redirect program execution flow, potentially allowing attackers to execute shellcode or other malicious payloads.
Mitigation strategies for CVE-2003-1260 primarily involve immediate software updates and patches provided by the vendor, as well as network-based protective measures that can limit exposure to vulnerable systems. Organizations should implement network segmentation to prevent unauthorized FTP server access and consider disabling automatic directory listing operations where possible. The vulnerability also highlights the importance of input validation and bounds checking in client applications, as recommended by security frameworks such as the OWASP Top Ten and NIST guidelines for secure coding practices. Additional protective measures include implementing network monitoring to detect unusual FTP traffic patterns and establishing secure FTP client configurations that limit the potential impact of such vulnerabilities. The incident underscores the critical need for regular security assessments and patch management processes, as the vulnerability remained unpatched for several years after its discovery, leaving numerous systems exposed to potential exploitation. This case serves as a historical example of how client-side applications can be vulnerable to attacks that originate from remote servers, emphasizing the importance of defense-in-depth strategies that protect against both known and unknown threats in networked environments.