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CVE-2025-3682: Critical Buffer Overflow Vulnerability in PCMan FTP Server 2.0.7

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Overview

This report discusses a critical vulnerability, identified as CVE-2025-3682, found in the PCMan FTP Server 2.0.7. This vulnerability affects the PASV Command Handler component of the software and can be exploited remotely, leading to potential system compromise or data leakage. Given the severity of the weakness and the fact that the exploit is already public, it is essential to understand and mitigate this vulnerability promptly.

Vulnerability Summary

CVE ID: CVE-2025-3682
Severity: Critical (CVSS 7.3)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

PCMan FTP Server | 2.0.7

How the Exploit Works

The vulnerability arises from a buffer overflow condition within the PASV Command Handler. An attacker can exploit this by sending a specially crafted PASV command that exceeds the buffer limit. This overflow condition can corrupt adjacent memory blocks, potentially allowing the execution of arbitrary code or causing the system to crash.

Conceptual Example Code

Here is a conceptual example of a malicious FTP command that might be used to exploit this vulnerability:

USER anonymous
PASS anonymous
PASV AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

The `A` characters above represent an oversize string intended to overflow the buffer in the PASV Command Handler. In a real attack, this string would likely contain malicious executable code.

Recommended Mitigations

The immediate mitigation for this vulnerability is to apply the vendor-provided patch. If the patch cannot be applied immediately, using Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can serve as a temporary mitigation. This can help detect and prevent exploitation attempts until the patch can be applied. It is crucial to keep all systems updated and frequently monitor for any unusual activity.

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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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