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CVE-2025-3678: Critical Buffer Overflow Vulnerability in PCMan FTP Server 2.0.7

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Overview

A critical vulnerability, identified as CVE-2025-3678, has been discovered in PCMan FTP Server 2.0.7. The vulnerability impacts the HELP Command Handler’s processing ability, leading to a buffer overflow. This vulnerability can be exploited remotely and may result in potential system compromise or data leakage. The severity of this vulnerability and the high potential for misuse necessitates immediate attention and remediation.

Vulnerability Summary

CVE ID: CVE-2025-3678
Severity: Critical (7.3 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

PCMan FTP Server| 2.0.7

How the Exploit Works

The vulnerability is due to improper handling of certain commands within the HELP Command Handler component of PCMan FTP Server 2.0.7. An attacker can exploit this vulnerability by sending a specially crafted command that triggers a buffer overflow. This can lead to arbitrary code execution, resulting in complete system compromise or potential data leakage.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This could be a sample FTP command leading to buffer overflow:

ftp> open target.example.com
Connected to target.example.com.
220 PCMan FTP Server 2.0.7 ready...
ftp> user anonymous
331 User name okay, need password.
ftp> pass anonymous
230 User logged in, proceed.
ftp> help AAAAAAAAAAAAAAAA...[long string]...

In this example, a long string of ‘A’s is sent to the `help` command, causing a buffer overflow.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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