CVE-2023-27910: Autodesk FBX SDK Buffer Overflow Flaw

CVE-2023-27910 Overview

A stack buffer overflow vulnerability exists in Autodesk FBX SDK 2020 and prior versions that can be exploited when a user opens a specially crafted malicious FBX file. This vulnerability could allow an attacker to achieve arbitrary code execution on the affected system. The attack requires user interaction, specifically tricking the target into opening a malicious FBX file, which makes this a viable vector for targeted attacks against users of 3D modeling and animation software that relies on the FBX SDK.

Critical Impact

Successful exploitation of this stack buffer overflow vulnerability enables attackers to execute arbitrary code in the context of the affected user, potentially leading to complete system compromise, data theft, or lateral movement within an organization's network.

Affected Products

• Autodesk FBX Software Development Kit 2020 and prior versions
• Applications built using vulnerable versions of Autodesk FBX SDK
• 3D modeling and animation software utilizing the FBX SDK library

Discovery Timeline

• April 17, 2023 - CVE-2023-27910 published to NVD
• February 6, 2025 - Last updated in NVD database

Technical Details for CVE-2023-27910

Vulnerability Analysis

This vulnerability is classified as a stack buffer overflow (CWE-121) and out-of-bounds write (CWE-787). The FBX file format is widely used for interchanging 3D geometry and animation data between various digital content creation applications. When the Autodesk FBX SDK parses a maliciously crafted FBX file, improper bounds checking allows data to be written beyond the allocated stack buffer boundaries.

The attack requires local access and user interaction—specifically, the victim must be convinced to open a malicious FBX file. This could occur through social engineering tactics such as phishing emails containing malicious attachments or compromised file-sharing platforms hosting weaponized FBX files. Upon successful exploitation, the attacker gains code execution with the privileges of the user running the vulnerable application.

Root Cause

The root cause of CVE-2023-27910 lies in insufficient input validation and boundary checking when the FBX SDK processes FBX file structures. When parsing certain elements within an FBX file, the SDK fails to properly validate the size of data being copied to stack-allocated buffers, allowing an attacker to craft file content that overflows these buffers. This classic memory corruption issue enables overwriting of adjacent stack memory, including return addresses, which can be leveraged to redirect program execution flow.

Attack Vector

The attack vector is local, requiring the attacker to deliver a malicious FBX file to the target system and convince the user to open it. Attack scenarios include:

• Spear-phishing campaigns targeting 3D artists, game developers, or CAD engineers with malicious FBX attachments
• Compromising file repositories or cloud storage services used for sharing 3D assets
• Supply chain attacks where legitimate FBX files are replaced with malicious versions
• Watering hole attacks on forums or websites frequented by 3D content creators

The vulnerability exploits the trust users place in FBX files as common interchange formats. When a victim opens the malicious file using any application that incorporates the vulnerable FBX SDK, the stack buffer overflow is triggered during file parsing, potentially leading to arbitrary code execution.

Detection Methods for CVE-2023-27910

Indicators of Compromise

• Unusual FBX files with abnormally large or malformed header structures
• Crash dumps or application errors related to FBX file parsing operations
• Unexpected child processes spawned by 3D modeling or animation applications
• Memory access violations or stack corruption events in applications using FBX SDK

Detection Strategies

• Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts and post-exploitation behavior
• Implement application whitelisting to prevent unauthorized code execution resulting from successful exploitation
• Monitor for unusual process behavior from applications that utilize the FBX SDK
• Configure security tools to flag FBX files from untrusted sources for additional analysis

Monitoring Recommendations

• Enable crash dump collection for applications using FBX SDK to identify potential exploitation attempts
• Implement file integrity monitoring on systems handling FBX files
• Configure logging for file access events related to FBX files, particularly from email attachments or downloads
• Deploy network traffic analysis to detect suspicious FBX file transfers

How to Mitigate CVE-2023-27910

Immediate Actions Required

• Update Autodesk FBX SDK to the latest patched version immediately
• Audit all applications in your environment that may incorporate the FBX SDK
• Implement strict file source verification before opening FBX files from external sources
• Educate users about the risks of opening FBX files from untrusted sources

Patch Information

Autodesk has released security updates addressing this vulnerability. Refer to the Autodesk Security Advisory ADSK-SA-2023-0004 for detailed patch information and download links. Organizations should upgrade to FBX SDK versions released after the advisory date. Additionally, third-party applications that bundle the FBX SDK should be updated to versions that incorporate the patched SDK.

Workarounds

• Restrict opening of FBX files to trusted sources only until patches can be applied
• Implement network segmentation to limit the blast radius if exploitation occurs
• Consider using sandboxed environments for processing FBX files from untrusted sources
• Deploy Data Loss Prevention (DLP) rules to quarantine FBX files from email attachments pending security review

# Example: Block FBX file attachments at the email gateway (syntax varies by product)
# Consult your email security gateway documentation for specific configuration
# This example shows the concept for rule creation

# 1. Create a content filter rule to quarantine FBX attachments
# Rule: Quarantine emails with .fbx attachments from external senders
# Action: Redirect to quarantine for security review

# 2. Application control policy (conceptual)
# Block execution of processes spawned by FBX-handling applications
# unless they match known-good behavior patterns