CVE-2003-1259 in CuteFTP
Summary
by MITRE
Buffer overflow in CuteFTP 4.2 and 5.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long FTP server banner.
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Analysis
by VulDB Data Team • 07/16/2024
The vulnerability identified as CVE-2003-1259 represents a critical buffer overflow flaw affecting CuteFTP versions 4.2 and 5.0, specifically within the FTP server banner handling mechanism. This issue stems from inadequate input validation and memory management practices within the client-side FTP application, creating a pathway for remote attackers to exploit the software through malformed server responses. The vulnerability manifests when the FTP client receives an excessively long banner message from a remote FTP server, causing the application to overwrite adjacent memory regions beyond the allocated buffer space. This type of flaw falls under the CWE-121 category of stack-based buffer overflow, where the buffer overflow occurs in stack memory and can lead to unpredictable behavior including application crashes or potential code execution.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it presents a potential vector for remote code execution. When an attacker crafts a malicious FTP server response containing an oversized banner string, the vulnerable CuteFTP client will attempt to store this data in a fixed-size buffer without proper bounds checking. This overflow can overwrite critical program memory including return addresses, function pointers, or other control data structures, potentially allowing an attacker to redirect program execution flow. The vulnerability demonstrates characteristics consistent with CWE-787, which describes out-of-bounds write conditions that can lead to arbitrary code execution when the overflow affects program control flow. Attackers exploiting this weakness could potentially inject and execute malicious code on the victim's system, making it particularly dangerous in environments where FTP clients are used to access untrusted servers.
The security implications of CVE-2003-1259 align with several ATT&CK tactics including privilege escalation and execution through the use of vulnerable client applications. The vulnerability exploits the trust relationship between FTP clients and servers, where clients typically do not validate server responses beyond basic protocol compliance. This weakness represents a classic example of insufficient input sanitization and memory safety issues that were prevalent in software development practices of the early 2000s. Organizations using CuteFTP 4.2 and 5.0 were particularly vulnerable because these versions lacked proper bounds checking mechanisms in their FTP banner processing routines. The attack scenario typically involves an attacker controlling an FTP server that responds with an oversized banner message, causing the vulnerable client to crash or potentially execute arbitrary code. This vulnerability highlights the importance of implementing proper memory management practices and input validation, particularly for applications that process network data from untrusted sources, as outlined in security standards such as the OWASP Top Ten and NIST guidelines for secure coding practices.
Mitigation strategies for this vulnerability include immediate patching of affected CuteFTP versions or upgrading to newer releases that implement proper bounds checking and memory management. System administrators should also consider implementing network segmentation and firewall rules to limit exposure to untrusted FTP servers, while network monitoring solutions can help detect unusual FTP server responses that might indicate exploitation attempts. Additionally, organizations should conduct thorough vulnerability assessments to identify all instances of the affected software within their environment and ensure that proper input validation mechanisms are in place for all network-facing applications. The remediation process should include comprehensive testing to verify that patches do not introduce regressions in functionality while ensuring that the memory safety issues have been properly addressed through proper buffer management and bounds checking implementations.