CVE-2020-7085 in FBX-SDK
Summary
by MITRE
A heap overflow vulnerability in the Autodesk FBX-SDK versions 2019.2 and earlier may lead to arbitrary code execution on a system running it.
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Analysis
by VulDB Data Team • 05/06/2025
The heap overflow vulnerability identified as CVE-2020-7085 resides within the Autodesk FBX-SDK library version 2019.2 and earlier, presenting a critical security risk that can potentially enable remote code execution on affected systems. This vulnerability specifically manifests when the FBX-SDK processes malformed or specially crafted FBX files, which are commonly used for 3D model exchange and animation data in various creative software applications. The FBX format serves as a universal standard for transferring 3D assets between different software platforms, making this vulnerability particularly concerning given the widespread adoption of Autodesk's 3D modeling tools across the entertainment, gaming, and design industries.
The technical flaw stems from insufficient input validation within the FBX-SDK's parsing routines, where the library fails to properly bounds-check memory allocations when processing certain FBX file structures. This deficiency allows an attacker to craft malicious FBX files that trigger a heap-based buffer overflow condition during the parsing process. When the vulnerable SDK attempts to read or write data beyond the allocated memory boundaries, it can overwrite adjacent memory locations, potentially corrupting critical program state or even allowing an attacker to inject and execute arbitrary code with the privileges of the affected application. The vulnerability operates at the memory management level, where improper handling of variable-length data structures in the FBX file format creates exploitable conditions that align with CWE-121, which describes heap-based buffer overflow conditions. This type of vulnerability is particularly dangerous because it can be triggered through legitimate file processing operations, making it difficult to distinguish between benign and malicious file interactions.
The operational impact of CVE-2020-7085 extends far beyond simple data corruption, as it represents a severe privilege escalation vector that can compromise entire systems when exploited. Applications that utilize the vulnerable FBX-SDK, including major 3D modeling software, animation tools, and game engines that support FBX file formats, become potential attack vectors. The vulnerability's exploitation can occur without user interaction, as simply opening or importing a malicious FBX file can trigger the overflow condition, making it particularly dangerous in environments where automated file processing occurs. This characteristic places the vulnerability in the ATT&CK framework under the T1059.007 technique for Command and Scripting Interpreter, as exploitation can lead to arbitrary code execution, and potentially T1190 for Exploit Public-Facing Application, since many 3D applications are exposed to external file inputs. The risk is amplified in professional environments where 3D assets are frequently shared and processed through various software platforms, creating multiple potential attack surfaces.
Mitigation strategies for CVE-2020-7085 require immediate attention from organizations utilizing affected Autodesk products, with the most effective approach being the upgrade to FBX-SDK version 2020.0 or later, where the heap overflow vulnerability has been addressed through proper input validation and memory management practices. System administrators should implement network segmentation and file access controls to limit exposure to potentially malicious FBX files, particularly in environments where 3D content is frequently exchanged or processed. Additionally, organizations should consider implementing sandboxing mechanisms for processing untrusted 3D content, which can help contain potential exploitation attempts. The vulnerability's classification as a heap-based buffer overflow aligns with security best practices outlined in the OWASP Top 10 and NIST guidelines for secure coding, emphasizing the need for robust input validation and memory safety practices. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of the vulnerable SDK within the organization's software ecosystem, as the FBX-SDK may be embedded within various applications and plugins that are not immediately obvious to administrators.