CVE-2003-0561 in IglooFTP Pro
Summary
by MITRE
Multiple buffer overflows in IglooFTP PRO 3.8 allow remote FTP servers to execute arbitrary code via (1) a long FTP banner, or long responses to the client commands (2) USER, (3) PASS, (4) ACCT, and possibly other commands.
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Analysis
by VulDB Data Team • 09/02/2024
The vulnerability identified as CVE-2003-0561 represents a critical buffer overflow issue affecting IglooFTP PRO 3.8, a widely used FTP client software. This flaw stems from inadequate input validation mechanisms within the application's handling of FTP server responses, creating exploitable conditions that could allow remote attackers to execute arbitrary code on vulnerable systems. The vulnerability specifically targets the client-side application's response handling capabilities when processing various FTP server communications, making it particularly dangerous as it can be triggered through normal FTP operations without requiring special privileges or authentication.
The technical implementation of this vulnerability involves multiple attack vectors that exploit buffer overflow conditions in the client software's response parsing mechanisms. Attackers can craft malicious FTP server responses containing excessively long strings that exceed the allocated buffer space in the client application. The vulnerability manifests when the software processes FTP banner messages or responses to client commands including USER, PASS, and ACCT commands, with potential impacts extending to other command types. This design flaw allows attackers to overwrite adjacent memory locations with malicious code, potentially leading to complete system compromise. The vulnerability directly maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which addresses heap-based buffer overflows, both of which are fundamental weaknesses in memory management that enable arbitrary code execution.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. When exploited successfully, the buffer overflow allows attackers to inject and execute malicious code with the privileges of the affected user account, potentially enabling unauthorized access to sensitive data, system file manipulation, or further network reconnaissance. The remote nature of the attack means that exploitation can occur without physical access to the target system, making it particularly dangerous for organizations relying on FTP clients for routine operations. This vulnerability also aligns with ATT&CK technique T1059.007, which covers command and scripting interpreter usage, as successful exploitation would likely involve executing malicious payloads through the compromised client application.
Mitigation strategies for this vulnerability require immediate patching of the affected IglooFTP PRO 3.8 installation with the vendor-provided security updates. Organizations should also implement network segmentation and access controls to limit exposure to potentially malicious FTP servers, while monitoring network traffic for suspicious FTP communications. Additional protective measures include disabling unnecessary FTP client functionality, implementing network-based intrusion detection systems, and conducting regular vulnerability assessments to identify similar issues in other client applications. The vulnerability demonstrates the critical importance of input validation and proper memory management in client applications, particularly those handling network communications with untrusted sources. Security professionals should also consider implementing application whitelisting policies and maintaining up-to-date threat intelligence to identify potential exploitation attempts targeting this and similar vulnerabilities.