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:
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