CVE-2025-47758: Stack-Based Buffer Overflow Vulnerability in V-SFT v6.2.5.0 and Earlier

Overview

The vulnerability we’re discussing today, designated as CVE-2025-47758, is a stack-based buffer overflow vulnerability that affects V-SFT versions 6.2.5.0 and earlier. This security vulnerability is especially concerning as it can lead to system crashes, information disclosure, and arbitrary code execution when opening specially crafted V7 or V8 files. The issue lies in the VS6File!CTxSubFile::get_ProgramFile_name function, and if exploited successfully, it could potentially lead to a full system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-47758
Severity: High (7.8 CVSS Score)
Attack Vector: Local
Privileges Required: User
User Interaction: Required
Impact: System crashes, information disclosure, arbitrary code execution, potential system compromise or data leakage

Affected Products

Product | Affected Versions

V-SFT | 6.2.5.0 and earlier

How the Exploit Works

The exploit takes advantage of a stack-based buffer overflow vulnerability in the VS6File!CTxSubFile::get_ProgramFile_name function of V-SFT. An attacker would create a specially crafted V7 or V8 file and induce a user to open it. This would result in an overflow of the stack buffer, leading to a system crash, information disclosure, or arbitrary code execution.

Conceptual Example Code

Here’s a conceptual example of how an attacker might craft a malicious V7 or V8 file to exploit this vulnerability:

# This is a conceptual example, and should not be used for malicious intent
def create_malicious_file(filename):
overflow_payload = 'A' * 1024  # Stack buffer size + 1
with open(filename, 'w') as file:
file.write(overflow_payload)
create_malicious_file('malicious.v7')

In the above example, the malicious file (‘malicious.v7’) contains a payload that exceeds the stack buffer size, leading to a buffer overflow when the file is opened using the vulnerable function in V-SFT.

Mitigation Guidance

Users and administrators are advised to apply the vendor-provided patch to mitigate this vulnerability. As a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used to detect and block attempts to exploit this vulnerability. However, these measures should only be considered as temporary, and the application of the vendor patch should not be delayed.