Advisory Details

August 26th, 2021

Microsoft Word glTF-SDK Out-Of-Bounds Write Remote Code Execution Vulnerability

ZDI-21-1024
ZDI-CAN-13401

CVE ID CVE-2021-34478
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Word
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Word. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the glTF-SDK component. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34478
DISCLOSURE TIMELINE
  • 2021-04-14 - Vulnerability reported to vendor
  • 2021-08-26 - Coordinated public release of advisory
CREDIT Thomas Bouzerar (@MajorTomSec) from Synacktiv (@Synacktiv)
BACK TO ADVISORIES