Description

Substance3D - Sampler 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": "2026-08-25T18:17:54.183Z",
  "pubdate": "2026-08-25T18:17:54.183Z",
  "executiveSummary": "Substance3D Sampler is susceptible to a heap-based buffer overflow vulnerability, categorized as a critical security flaw. This memory corruption issue enables an attacker to achieve arbitrary code execution within the security context of the current user.\nThe vulnerability manifests when the application processes a specially crafted, malicious file. Successful exploitation requires user interaction, specifically the opening of the malicious file by an unsuspecting victim. Upon execution, the payload can compromise the integrity, confidentiality, and availability of the host system.\nAs an attacker-controlled file can trigger the overflow, the risk is significant for users who interact with untrusted third-party content. There are no authentication or network exposure requirements for this vulnerability, as the attack vector is localized to file parsing. The impact includes potential full system compromise, unauthorized data exfiltration, or the installation of persistent malware, operating under the privileges of the active user session.",
  "technicalDetails": "The vulnerability originates from improper bounds checking during the parsing of malformed files within Substance3D Sampler. Specifically, the heap-based buffer overflow occurs when the application allocates insufficient memory for input data or fails to validate the size of the data being copied into a heap-allocated buffer. When the input exceeds the allocated heap space, the application overwrites adjacent memory structures.\nThe attack flow begins with the delivery of a malicious file to the end user. When the user opens this file in Substance3D Sampler, the vulnerable parsing engine initiates memory operations. The overflow allows an attacker to corrupt heap metadata or internal application objects, such as function pointers or object vtables. By carefully structuring the malicious file, an attacker can redirect the program's execution flow to an arbitrary memory location, effectively controlling the instruction pointer (EIP/RIP).\nGiven that the overflow occurs on the heap, exploitation typically involves heap grooming or heap spraying techniques to place malicious shellcode or ROP (Return-Oriented Programming) chains into a predictable memory location. Once the pointer is hijacked, the payload executes with the privileges of the logged-in user. This bypasses typical user-mode security protections unless robust Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) are circumvented via advanced ROP chain construction.\nThe vulnerable component is the file input/output processing logic, which lacks sufficient validation to ensure that incoming data conforms to defined format specifications. Since this process occurs during the standard file loading sequence, the attacker does not require prior authentication or elevated privileges; they only rely on the user opening the file. The post-exploitation impact allows for the execution of arbitrary binary code, facilitating the deployment of payloads that can interact with the underlying OS kernel, modify user files, or communicate with external command-and-control (C2) infrastructure."
}