CVE-2025-3727 in FTP Server
Summary
by MITRE • 04/17/2025
A vulnerability classified as critical has been found in PCMan FTP Server 2.0.7. This affects an unknown part of the component STATUS Command Handler. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 05/13/2025
The vulnerability identified as CVE-2025-3727 represents a critical buffer overflow flaw within PCMan FTP Server version 2.0.7, specifically within the STATUS Command Handler component. This type of vulnerability falls under CWE-121, which categorizes buffer overflow conditions where insufficient boundary checking allows attackers to write beyond allocated memory regions. The affected server component processes status commands that are commonly used in ftp protocol operations to retrieve server status information and file transfer details. The buffer overflow occurs when the server fails to properly validate input length before processing STATUS command parameters, creating an exploitable condition that can be triggered through network communication.
The operational impact of this vulnerability extends beyond simple denial of service scenarios as it enables remote code execution capabilities through carefully crafted malicious input sequences. Attackers can exploit this weakness by sending specially formatted STATUS commands to the vulnerable FTP server, potentially leading to complete system compromise. The remote attack vector eliminates the need for physical access or local network presence, making the vulnerability particularly dangerous for organizations that expose FTP services to untrusted networks. This vulnerability aligns with ATT&CK technique T1190, which describes exploitation of remote services, and T1059, covering command and scripting interpreters used for execution. The public disclosure of exploit code further amplifies the risk level, as it removes the barrier to entry for potential attackers who may not possess advanced exploitation skills.
Organizations utilizing PCMan FTP Server 2.0.7 must immediately implement mitigation strategies to protect their infrastructure from potential exploitation. The primary remediation involves upgrading to a patched version of the software that properly implements input validation and boundary checking within the STATUS Command Handler. System administrators should also consider implementing network segmentation and firewall rules to restrict access to FTP services, particularly from untrusted networks. Additional protective measures include deploying intrusion detection systems that can identify suspicious STATUS command patterns and monitoring for unusual FTP traffic behavior. The vulnerability demonstrates the importance of proper input validation in network services, a principle that aligns with secure coding practices outlined in OWASP Top Ten and NIST SP 800-160 standards. Organizations should also conduct comprehensive vulnerability assessments to identify other potentially affected services and ensure that similar buffer overflow conditions are not present in their broader network infrastructure.