CVE-2021-1711: Microsoft Office Remote Code Execution Vulnerability

Virsec Security Research Lab Vulnerability Analysis

The Virsec Security Research Lab provides timely, relevant analysis about recent and notable security vulnerabilities.

1.1        Vulnerability Summary

Microsoft Office Remote Code Execution Vulnerability

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1.2        CVSS Score

CVSS Base score of this vulnerability is 7.8 High.  CVSS:3.1/AV:L/AC:L/PR:N/UI:Y/S:U/C:N/I:N/A:H

1.3        Affected Version

• Microsoft Office 2013 Service Pack 1 (64-bit editions)

• Microsoft Office 2013 Service Pack 1 (32-bit editions)

• Microsoft Office 2013 RT Service Pack 1

• Microsoft Office 2010 Service Pack 2 (64-bit editions)

• Microsoft Office 2010 Service Pack 2 (32-bit editions)

• Microsoft Office 2016 (64-bit edition)

• Microsoft Office 2016 (32-bit edition)

• Microsoft 365 Apps for Enterprise for 64-bit Systems

• Microsoft 365 Apps for Enterprise for 32-bit Systems

• Microsoft Office 2019 for 64-bit editions

• Microsoft Office 2019 for 32-bit editions

1.4        Vulnerability Attribution

This vulnerability is reported by - Tao Yan (@Ga1ois) from Palo Alto Networks and Bo Qu of Palo Alto Networks.

1.5        Risk Impact

As per this website, MS office has around 41% market share. According to Microsoft's FY20 Q1 results, Office 365 now has 200 million monthly active users.

Any vulnerability in office product would allow attacker to plant millions of backdoor on user machines and then use them as lateral movement.

Public exploit is not available.

1.6        Virsec Security Platform (VSP) Support:

VSP-Host monitors processes that are spawned which are not part of a set of whitelisted process. Any attempt to execute new command or unknown binary would be denied by VSP-Host’s Process Monitoring capability.

1.7        Reference Links:

• • NVD - CVE-2021-1711 (nist.gov)
  • https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1711

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