Description

Substance3D - Designer is affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-25T18:18:01.790Z",
  "pubdate": "2026-08-25T18:18:01.790Z",
  "executiveSummary": "Substance3D Designer contains an out-of-bounds write vulnerability that poses a significant risk to user systems. This vulnerability originates from improper memory handling within the application when processing specific file structures. An attacker can leverage this flaw to achieve arbitrary code execution on a victim's machine, effectively inheriting the privileges of the currently logged-in user.\nThe attack vector is classified as local and requires social engineering, as the victim must be convinced to open a maliciously crafted file. Successful exploitation bypasses standard application-level security controls, potentially allowing an attacker to install software, view or alter data, or create accounts with full user rights. Given the nature of the vulnerability, it represents a critical risk to users who interact with untrusted third-party files. No network exposure is required for the initial trigger, as the execution occurs client-side upon parsing the malformed data.",
  "technicalDetails": "The vulnerability resides within the file parsing logic of Substance3D Designer, specifically concerning the handling of serialized objects or complex data structures embedded within proprietary file formats. An out-of-bounds write occurs when the application fails to perform adequate bounds checking on inputs before writing data to an allocated memory buffer.\nWhen a malicious file is opened, the application's parser performs a heap-based or stack-based operation based on values supplied in the file headers or data blocks. If these values are manipulated to point to an offset outside the intended buffer boundaries, the application inadvertently overwrites adjacent memory. This memory corruption can be leveraged to overwrite critical application pointers, such as return addresses or function pointers in the process's memory space.\nThe exploitation flow follows a precise sequence: First, the attacker creates a specially crafted file containing malformed metadata designed to trigger the out-of-bounds condition. Second, the victim is coerced into opening this file through Substance3D Designer. Third, upon processing the malformed data, the application performs a write operation that exceeds the designated memory region. Fourth, by carefully controlling the memory layout through heap spraying or similar techniques, the attacker forces the out-of-bounds write to overwrite an instruction pointer or a Virtual Method Table (vtable) entry.\nThis control over the execution flow allows the attacker to redirect program execution to an arbitrary payload, such as a shellcode sequence included in the malicious file or a Return-Oriented Programming (ROP) chain. Because the process is executing in the context of the current user, the payload runs with the user's full permissions, facilitating complete system compromise. This vulnerability does not require authentication or elevated privileges prior to exploitation, relying entirely on the application's lack of internal input validation. The post-exploitation phase typically involves establishing persistence, exfiltrating sensitive project files, or deploying further malware payloads to broaden the scope of the compromise within the host operating system."
}