Advisory Details

September 12th, 2023

Microsoft Office Word FBX File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

ZDI-23-1421
ZDI-CAN-21615

CVE ID CVE-2023-27909
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 Office
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Office 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 parsing of FBX files. 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-2023-27909
DISCLOSURE TIMELINE
  • 2023-08-03 - Vulnerability reported to vendor
  • 2023-09-12 - Coordinated public release of advisory
CREDIT Anonymous
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