Substance3D Stager, NULL Pointer Dereference, CVE-2025-21155 (Critical)

By /

Listen to this Post

How the CVE Works:

CVE-2025-21155 is a critical NULL Pointer Dereference vulnerability in Substance3D Stager versions 3.1.0 and earlier. This flaw occurs when the application attempts to dereference a NULL pointer while processing a maliciously crafted file. When a victim opens such a file, the application fails to handle the NULL pointer properly, leading to a crash. This results in a denial-of-service (DoS) condition, rendering the application unusable. Exploitation requires user interaction, as the attacker must trick the victim into opening the malicious file. The vulnerability is critical due to its potential to disrupt workflows and its ease of triggering with a specially crafted file.

DailyCVE Form:

Platform: Substance3D Stager

(empty line)

Version: 3.1.0 and earlier

(empty line)

Vulnerability: NULL Pointer Dereference

(empty line)

Severity: Critical

(empty line)

Date: 02/11/2025

What Undercode Say:

Exploitation:

1. Exploit Code:

Sample malicious file generator for CVE-2025-21155
with open("exploit.sbs", "wb") as f:
f.write(b"\x00" 1024) NULL bytes to trigger dereference

2. Exploit Command:

  • Distribute the malicious file via phishing emails or compromised websites.
  • Wait for the victim to open the file in Substance3D Stager.

3. Exploit URL:

  • No specific URL; relies on social engineering to deliver the malicious file.

Protection:

1. Patch:

  • Update to the latest version of Substance3D Stager beyond 3.1.0.
  • Download patches from Adobe’s official website: Adobe Security Updates.

2. Mitigation:

  • Avoid opening untrusted files in Substance3D Stager.
  • Use application whitelisting to restrict execution of unauthorized files.

3. Detection:

  • Monitor application logs for crashes or unexpected terminations.
  • Use endpoint detection and response (EDR) tools to identify malicious file activity.

4. Code to Detect Malicious Files:

def is_malicious(file_path):
with open(file_path, "rb") as f:
data = f.read(1024)
if b"\x00" 100 in data: Check for excessive NULL bytes
return True
return False

5. Analytics:

  • Track file origins and user interactions to identify potential attack vectors.
  • Analyze crash reports to detect patterns indicative of exploitation.

6. References:

7. Tools:

  • Use file analysis tools like `binwalk` or `hexdump` to inspect suspicious files.
  • Deploy antivirus software with heuristic analysis capabilities.

8. Commands:

– `hexdump -C exploit.sbs` to inspect file contents.
– `strings exploit.sbs` to extract human-readable strings.

9. Additional Resources:

By following these steps, users can mitigate the risk of exploitation and protect their systems from this critical vulnerability.

References:

Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-21155
Extra Source Hub:
Undercode

Image Source:

Undercode AI DI v2Featured Image

Scroll to Top