Advisory Details

May 13th, 2021

Microsoft Office Graph Use-After-Free Remote Code Execution Vulnerability

ZDI-21-580
ZDI-CAN-13497

CVE ID CVE-2021-31175
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. 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 Graph COM object. The issue results from the lack of validating the existence of an object prior to performing operations on the object. 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-2021-31175
DISCLOSURE TIMELINE
  • 2021-04-02 - Vulnerability reported to vendor
  • 2021-05-13 - Coordinated public release of advisory
CREDIT L4
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