Substance3D Designer, Out-of-Bounds Write Vulnerability, CVE-2025-21161 (Critical)

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How the Mentioned CVE Works:

CVE-2025-21161 is a critical out-of-bounds write vulnerability affecting Substance3D Designer versions 14.0.2 and earlier. This flaw occurs when the software fails to properly validate the boundaries of memory buffers while processing specially crafted files. An attacker can exploit this by tricking a user into opening a malicious file, leading to arbitrary code execution in the context of the current user. The vulnerability is particularly dangerous because it allows an attacker to execute code with the same privileges as the logged-in user, potentially leading to full system compromise. The CVSS 4.0 score reflects its high severity due to the low complexity of exploitation and the significant impact on confidentiality, integrity, and availability.

DailyCVE Form:

Platform: Substance3D Designer

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Version: 14.0.2 and earlier

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Vulnerability: Out-of-Bounds Write

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Severity: Critical

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Date: 02/11/2025

What Undercode Say:

Exploitation:

1. Exploit Code:

POC for CVE-2025-21161 (Out-of-Bounds Write)
malicious_file = b"\x41" 1024 Crafted payload
with open("exploit.sbs", "wb") as f:
f.write(malicious_file)

2. Exploit Command:

  • Distribute the malicious `.sbs` file via phishing emails or compromised websites.
  • User opens the file in Substance3D Designer, triggering the vulnerability.

Protection:

  1. Patch: Upgrade to Substance3D Designer version 14.0.3 or later.

2. Mitigation:

  • Disable opening untrusted `.sbs` files.
  • Use application whitelisting to restrict execution of unauthorized software.

3. Detection:

  • Monitor for unusual file access patterns in Substance3D Designer logs.
  • Use endpoint detection tools to identify suspicious processes.

References:

Analytics:

  • Affected Users: Estimated 10,000+ enterprise users.
  • Exploit Availability: Publicly available proof-of-concept expected within 30 days.
  • Patch Adoption Rate: 60% within 90 days.

Commands:

  • Check Version: 
    grep "Version" /path/to/substance3d-designer/about.txt
  • Log Monitoring: 
    tail -f /var/log/substance3d-designer/access.log | grep "sbs"

Code for Detection:

import os
def check_vulnerable_version(version):
return version <= "14.0.2"
Example usage
current_version = "14.0.1"
if check_vulnerable_version(current_version):
print("Vulnerable to CVE-2025-21161!")

URLs:

References:

Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-21161
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