CVE-2024-20677: office Heap Overflow — Fix

Description

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-122 CWE-122

Affected Products

Vendor	Product	Versions
microsoft	365_apps	All
microsoft	office	All
microsoft	office_long_term_servicing_channel	All
microsoft	office_long_term_servicing_channel	All

References

Advisories & Patches

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20677 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20677

Frequently Asked Questions

What is CVE-2024-20677? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-20677? +

CVE-2024-20677 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-20677? +

CVE-2024-20677 affects products from microsoft, specifically: 365_apps, office, office_long_term_servicing_channel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-20677? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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