CVE-2025-3725 in FTP Server
Summary
by MITRE • 04/16/2025
A vulnerability was found in PCMan FTP Server 2.0.7. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component MIC Command Handler. The manipulation leads to buffer overflow. The attack can be launched 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-2025-3725 represents a critical buffer overflow condition within PCMan FTP Server version 2.0.7, specifically affecting the MIC Command Handler component. This flaw exists within the server's command processing logic where insufficient input validation occurs during the handling of maliciously crafted MIC commands. The buffer overflow vulnerability arises when the server attempts to process user-supplied data without proper bounds checking, allowing an attacker to overwrite adjacent memory locations and potentially execute arbitrary code. The critical severity classification stems from the remote exploitability of this vulnerability, which means attackers can leverage it without requiring physical access or local privileges.
The technical implementation of this vulnerability demonstrates a classic buffer overflow scenario where the MIC Command Handler fails to properly validate the length of incoming data before copying it into fixed-size buffers. This type of flaw falls under CWE-121, which describes stack-based buffer overflow conditions, and may also relate to CWE-122 for heap-based buffer overflows depending on the specific memory allocation patterns. The vulnerability's remote exploitability indicates that the attack vector operates over network protocols, likely leveraging the FTP server's command interface where the MIC command handler processes user inputs. Attackers can craft malicious MIC commands that exceed the allocated buffer space, causing memory corruption that can be leveraged for code execution or system compromise.
The operational impact of this vulnerability extends beyond simple exploitation as it provides attackers with potential persistence mechanisms and privilege escalation opportunities. Once successfully exploited, the buffer overflow could allow remote code execution with the privileges of the FTP server process, potentially leading to complete system compromise. The public disclosure of the exploit increases the risk profile significantly, as threat actors can readily implement automated attack scripts against vulnerable installations. Organizations running PCMan FTP Server 2.0.7 are at heightened risk of unauthorized access, data exfiltration, and potential lateral movement within networks where FTP services are exposed to external traffic. The vulnerability affects systems where the MIC command handler is enabled, making it particularly concerning for organizations that utilize this specific FTP server implementation.
Mitigation strategies for CVE-2025-3725 should prioritize immediate patching of the PCMan FTP Server to the latest version that addresses this buffer overflow vulnerability. System administrators should implement network segmentation to limit exposure of FTP services to trusted networks only, while also configuring firewall rules to restrict access to FTP ports from unnecessary sources. Additional protective measures include disabling the MIC command handler functionality if it is not required for operations, implementing intrusion detection systems to monitor for suspicious FTP command patterns, and conducting comprehensive vulnerability assessments of all FTP server installations. Organizations should also consider implementing network monitoring solutions that can detect anomalous behavior indicative of exploitation attempts, such as unusual command sequences or memory access patterns that may precede buffer overflow exploitation. The ATT&CK framework categorizes this vulnerability under T1190 for exploit public-facing application, highlighting the importance of maintaining up-to-date security patches and network segmentation as primary defensive measures against such attacks.