CVE-2020-37032 in FTP Server
Summary
by MITRE • 01/31/2026
Wing FTP Server 6.3.8 contains a remote code execution vulnerability in its Lua-based web console that allows authenticated users to execute system commands. Attackers can leverage the console to send POST requests with malicious commands that trigger operating system execution through the os.execute() function.
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Analysis
by VulDB Data Team • 01/31/2026
The vulnerability identified as CVE-2020-37032 represents a critical remote code execution flaw within Wing FTP Server version 6.3.8, specifically affecting its Lua-based web console interface. This vulnerability arises from insufficient input validation and sanitization within the web console's command execution mechanisms, creating a dangerous attack surface that can be exploited by authenticated users to gain unauthorized system control. The flaw exists in the server's handling of user-supplied data within the Lua scripting environment, where malicious input can be directly passed to system execution functions without proper sanitization. Security researchers have identified that the vulnerability stems from improper handling of user-controllable parameters within the web interface, which are then processed through the os.execute() function in the Lua runtime environment. This represents a classic command injection vulnerability that allows arbitrary code execution on the target system with the privileges of the running FTP server process.
The technical exploitation of this vulnerability requires an authenticated user account with access to the web console interface, which significantly reduces the attack surface compared to fully unauthenticated exploits. However, the impact remains severe as the authenticated user can leverage the console to send specially crafted POST requests containing malicious commands that are then executed through the underlying operating system. The vulnerability specifically targets the Lua scripting engine's os.execute() function, which serves as the execution point where user input is directly translated into system commands without adequate validation or filtering. This design flaw allows attackers to bypass normal security boundaries and execute arbitrary system-level operations including file manipulation, process management, network communications, and potentially privilege escalation to root or administrator levels. The vulnerability aligns with CWE-77 and CWE-94 categories, representing command injection and code injection weaknesses respectively, while also mapping to ATT&CK technique T1059.007 for execution through script interpreters and T1078 for legitimate credential use.
The operational impact of CVE-2020-37032 extends beyond simple unauthorized access, as authenticated attackers can leverage this vulnerability to establish persistent access, exfiltrate sensitive data, and potentially use the compromised system as a launch point for further attacks within the network. The vulnerability affects organizations that rely on Wing FTP Server for file transfer operations, particularly those with multiple user accounts or systems where administrative privileges are shared among users. Attackers can use this vulnerability to escalate privileges, install backdoors, modify system configurations, or deploy malware directly onto the compromised server. The impact is particularly severe in environments where the FTP server operates with elevated privileges or where the server hosts sensitive data that requires protection. Organizations with inadequate network segmentation may find that this vulnerability allows lateral movement within their infrastructure, as attackers can use the compromised FTP server as a pivot point to target other systems. The vulnerability also poses risks to compliance requirements and data protection standards, as unauthorized system access can lead to data breaches and regulatory violations.
Mitigation strategies for CVE-2020-37032 should focus on immediate patching of the Wing FTP Server software to the latest version that addresses this vulnerability. Organizations should implement network segmentation and access controls to limit exposure of the web console to trusted users only, while also monitoring for unusual POST requests or command execution patterns. The implementation of web application firewalls and input validation mechanisms can provide additional layers of protection against exploitation attempts. Security teams should conduct regular vulnerability assessments and penetration testing to identify similar flaws in other systems, while also implementing principle of least privilege for FTP server accounts to minimize potential damage from exploitation. Regular security updates and patch management processes should be enforced to prevent similar vulnerabilities from remaining unaddressed in the organization's infrastructure. Additionally, organizations should consider implementing monitoring solutions that can detect anomalous system command execution patterns and alert security teams to potential exploitation attempts, ensuring that any unauthorized system activity is promptly identified and addressed.