Description

Substance3D - Designer is affected by a Heap-based Buffer Overflow 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": "2026-08-25T18:17:54.627Z",
  "pubdate": "2026-08-25T18:17:54.627Z",
  "executiveSummary": "Substance3D Designer is susceptible to a heap-based buffer overflow vulnerability, categorized as a critical memory safety flaw. This vulnerability arises due to improper boundary validation during the parsing of specifically crafted files.\nSuccessful exploitation allows an unauthenticated attacker to execute arbitrary code within the security context of the current user. The primary vector for this vulnerability is user-assisted, requiring the victim to open a maliciously constructed file within the application.\nThe risk implication is significant, as the exploitation of heap-based memory corruption often facilitates reliable code execution, potentially leading to full system compromise, lateral movement within the network, or data exfiltration, depending on the privileges of the affected user.\nThere are no authentication or specific network requirements, as the attack is file-based and client-side. The vulnerability underscores the danger of processing untrusted data in complex rendering or design software environments.",
  "technicalDetails": "The vulnerability resides within the file parsing logic of Substance3D Designer, specifically where the software handles heap-allocated memory buffers when ingesting file structures. A heap-based buffer overflow occurs when the application fails to perform adequate bounds checking on the size of input data provided in a file before writing that data into a pre-allocated heap buffer.\nThe root cause is likely an integer overflow or a missing validation check that permits an attacker to supply a malicious file containing metadata or geometry data that exceeds the reserved heap buffer capacity. By manipulating the file structure, an attacker can trigger an out-of-bounds write operation, overwriting adjacent memory locations on the heap.\nThe attack flow begins when a user initiates the parsing of a malicious file. Upon processing, the vulnerable component attempts to read or decompress data into a memory buffer. If the input exceeds the buffer's defined capacity, the software writes the extraneous data into the heap, potentially overwriting critical data structures such as object pointers, function pointers, or C++ virtual method tables (vtable).\nBy precisely crafting the malicious file, an attacker can control the contents of the heap at the target memory location. The subsequent redirection of execution flow is achieved by overwriting a function pointer with the address of attacker-supplied shellcode or by utilizing Return-Oriented Programming (ROP) techniques to bypass Data Execution Prevention (DEP).\nOnce the attacker successfully redirects the execution pointer, the payload executes with the privileges of the user running Substance3D Designer. This could involve the installation of persistent malware, credential harvesting, or further exploitation of the host system. Because this occurs at the user-application level, the exploit operates in the context of the user, meaning it does not require administrative or system-level privileges to initiate code execution, though such privileges may be sought post-exploitation.\nThis vulnerability is particularly dangerous because it does not rely on network services or exposed ports; it is an intrinsic flaw in the file handling architecture. The absence of robust input validation during the file deserialization process is the primary technical failure point."
}