CVE-2025-47750: Critical Out-of-Bounds Write Vulnerability in V-SFT

Overview

The cybersecurity landscape has been rocked by the discovery of yet another severe vulnerability, this time affecting V-SFT version 6.2.5.0 and earlier. This vulnerability, designated as CVE-2025-47750, exposes users to potential system compromise and data leakage. This is particularly concerning as V-SFT is a widely utilized software, amplifying the potential impact. The importance of understanding and mitigating this vulnerability cannot be overstated, as it could be exploited to execute arbitrary code, potentially leading to loss of control over system resources or unauthorized access to sensitive information.

Vulnerability Summary

CVE ID: CVE-2025-47750
Severity: High (7.8 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System compromise, data leakage, and potential execution of arbitrary code

Affected Products

Product | Affected Versions

V-SFT | v6.2.5.0 and earlier

How the Exploit Works

The vulnerability lies in the VS6MemInIF!set_temp_type_default function of V-SFT. A specially crafted V7 or V8 file, when opened, triggers an out-of-bounds write. This can lead to a system crash, information disclosure, or even arbitrary code execution. The attacker would need to convince the user to open the malicious file, which might be disguised as a legitimate document or sent via a phishing email.

Conceptual Example Code

Here’s a conceptual example of how this vulnerability might be exploited. In this case, the attacker sends a specially crafted V7 or V8 file to the victim. This file, when opened with V-SFT, triggers the vulnerability:

# Attacker crafts a malicious V7 or V8 file
$ craft-malicious-file -o exploit.v7 "malicious_payload"
# The victim opens the malicious file with V-SFT
$ v-sft open exploit.v7

This shell command example demonstrates the simplicity with which an attacker could exploit this vulnerability, provided they have crafted the malicious file correctly and managed to convince the victim to open it.

Recommended Mitigations

To mitigate this vulnerability, it is highly recommended to apply the vendor-supplied patch as soon as it becomes available. If the patch is not immediately available or cannot be applied in a timely manner, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation. These tools can detect and block attempts to exploit this vulnerability, providing a crucial layer of defense. However, they are not a permanent solution and should be used in conjunction with other security measures, such as user education and software patching.