CVE-2025-4290 in FTP Server
Summary
by MITRE • 05/06/2025
A vulnerability, which was classified as critical, has been found in PCMan FTP Server 2.0.7. This issue affects some unknown processing of the component SMNT Command Handler. The manipulation leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 05/06/2025
The vulnerability identified as CVE-2025-4290 represents a critical buffer overflow flaw within PCMan FTP Server version 2.0.7 that specifically impacts the SMNT Command Handler component. This type of vulnerability falls under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The flaw exists in the server's handling of the SMNT (Set Mount Point) command, a specialized ftp command used to specify mount points for file systems. The attack vector is remote, meaning an unauthenticated attacker can exploit this vulnerability from outside the network without requiring prior access credentials.
The technical exploitation of this buffer overflow occurs when the SMNT Command Handler processes malformed input data without proper validation or size limitations. When an attacker sends a specially crafted SMNT command with excessive data payload, the server's memory management fails to properly handle the overflow condition, potentially allowing arbitrary code execution or system crash. This vulnerability directly relates to ATT&CK technique T1203, which covers exploitation of remote services, and T1059, covering command and scripting interpreters. The buffer overflow could enable attackers to overwrite critical memory segments including return addresses, function pointers, or other control data structures, leading to complete system compromise.
The operational impact of this vulnerability extends beyond simple service disruption as it provides attackers with potential full system control capabilities. Remote exploitation allows adversaries to execute malicious code with the privileges of the ftp server process, which may run with elevated permissions depending on the system configuration. This could result in unauthorized data access, data modification, or complete system takeover. Organizations running PCMan FTP Server 2.0.7 are particularly at risk since the exploit has been publicly disclosed, meaning threat actors have readily available tools to target these systems. The vulnerability affects any system that accepts SMNT commands, making it a significant concern for ftp server implementations that have not been patched or updated to address this specific memory handling flaw.
Mitigation strategies should prioritize immediate patching of the PCMan FTP Server to the latest version that addresses this buffer overflow condition. System administrators should also implement network segmentation and firewall rules to restrict access to ftp services to only trusted networks and IP addresses. Additional protective measures include monitoring ftp server logs for suspicious SMNT command usage, implementing intrusion detection systems to identify potential exploitation attempts, and conducting regular vulnerability assessments of ftp server implementations. The use of network-based application firewalls or web application firewalls can help filter malicious SMNT commands before they reach the vulnerable server component. Organizations should also consider disabling unnecessary ftp commands and implementing strict input validation for all ftp protocol interactions to reduce the attack surface and minimize potential exploitation success rates.