A security vulnerability exists in FBX that could lead to remote code execution. To mitigate this vulnerability, the ability to insert FBX files has been disabled in Word, Excel, PowerPoint, and Outlook for Windows and Mac. Versions of Office that had this feature enabled will no longer have access to it. This includes Office 2019, Office 2021, Office LTSC for Mac 2021, and Microsoft 365. As of February 13, 2024, the ability to insert FBX files has also been disabled in 3D Viewer.
3D models in Office documents that were previously inserted from a FBX file will continue to work as expected unless the Link to File option was chosen at insert time. This change is effective as of the January 9, 2024 security update.
With a CVSS score of 7.8, this high-severity vulnerability poses significant risks to organizations utilizing affected Microsoft products. The urgency for defenders to address this vulnerability is critical, as it opens avenues for potential exploitation.
Organizations should prioritize patching immediately. The risk to organizations includes unauthorized remote code execution, which could lead to severe breaches and data loss.
Given the increasing complexity of cybersecurity threats, understanding and mitigating this vulnerability is crucial for maintaining organizational security.
Vulnerability Details
The vulnerability identified as CVE-2024-20677 allows for potential remote code execution through FBX files within Microsoft Office applications. The CVSS score of 7.8 categorizes this vulnerability as high severity, indicating significant risk. The affected products include Microsoft 365, Office 2019, Office 2021, and Office LTSC for Mac 2021. The vulnerability was officially published on January 9, 2024, and has been classified under CWE-122.
Technical Analysis
The root cause of this vulnerability stems from the ability to insert FBX files without sufficient validation, allowing attackers to execute arbitrary code remotely. The attack vector is local, with low complexity and no privileges required. User interaction is necessary to exploit the vulnerability, as it requires the insertion of the FBX file.
The confidentiality, integrity, and availability impacts are categorized as high, indicating that successful exploitation could significantly compromise system security.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is substantial. Organizations that continue to use affected Microsoft Office products without addressing this vulnerability may face unauthorized remote code execution, leading to severe breaches, data loss, and reputational damage. The blast radius potential is significant, as this vulnerability impacts multiple Office products, increasing the risk of widespread exploitation.
Organizations should assess their exposure and prioritize remediation efforts based on the CVSS score of 7.8, emphasizing the urgency to patch as part of their security policies.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include Microsoft 365, Office 2019, Office 2021, and Office LTSC for Mac 2021. All versions prior to vendor patch are vulnerable.
Mitigation & Remediation
To mitigate this vulnerability, organizations should ensure they have applied the latest security updates provided by Microsoft. The specific update that addresses this vulnerability was released on January 9, 2024. Organizations should also consider implementing additional security measures such as configuration hardening and network controls to limit the exposure of Office applications.
Organizations should validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for unusual file insertions, particularly regarding FBX files. Behavioral anomalies in Office applications should be tracked, along with network signatures that indicate potential exploitation attempts. System changes should also be monitored closely to identify any unauthorized modifications.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability is notable given the ongoing reliance on Microsoft Office applications in business environments. This vulnerability exemplifies the need for continuous vigilance and proactive security measures in software development and application usage. Security teams should learn from this incident to enhance their defensive strategies and prioritize vulnerabilities that may pose similar risks.
Organizations should consider adopting a comprehensive vulnerability management program to address similar issues proactively. For guidance on building such a program, refer to our vulnerability management program and to implement ongoing security assessments, including regular penetration testing to identify and mitigate vulnerabilities effectively.
Additionally, teams should stay informed about emerging threats and vulnerabilities relevant to their technology stack to maintain robust defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)