Microsoft Office and Microsoft Office Services and Web Apps: Multiple vulnerabilities

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                         ZMCIRT Vulnerability Bulletin

                             ZMC-2021.11.10.0800
                       Microsoft Office and Microsoft Office Services and Web Apps: Multiple vulnerabilities
                               10th November 2021

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Product:          Microsoft Office
                  Microsoft Office Services and Web Apps
Operating System: Windows
Impact/Access:    Execute Arbitrary Code/Commands -- Existing Account
                  Unauthorised Access             -- Existing Account
Resolution:       Patch/Upgrade
CVE Names:        CVE-2021-42296 CVE-2021-42292 CVE-2021-41368
                  CVE-2021-40442  

Comment: Microsoft is aware that exploits for CVE-2021-42292 exist in the wild.

OVERVIEW

        Microsoft has released its monthly security patch update for the
        month of November 2021.
        
        This update resolves 4 vulnerabilities across the following products:
        [1]
        
         Microsoft 365 Apps for Enterprise for 32-bit Systems
         Microsoft 365 Apps for Enterprise for 64-bit Systems
         Microsoft Excel 2013 RT Service Pack 1
         Microsoft Excel 2013 Service Pack 1 (32-bit editions)
         Microsoft Excel 2013 Service Pack 1 (64-bit editions)
         Microsoft Excel 2016 (32-bit edition)
         Microsoft Excel 2016 (64-bit edition)
         Microsoft Office 2013 RT Service Pack 1
         Microsoft Office 2013 Service Pack 1 (32-bit editions)
         Microsoft Office 2013 Service Pack 1 (64-bit editions)
         Microsoft Office 2016 (32-bit edition)
         Microsoft Office 2016 (64-bit edition)
         Microsoft Office 2019 for 32-bit editions
         Microsoft Office 2019 for 64-bit editions
         Microsoft Office 2019 for Mac
         Microsoft Office LTSC 2021 for 32-bit editions
         Microsoft Office LTSC 2021 for 64-bit editions
         Microsoft Office LTSC for Mac 2021
         Microsoft Office Online Server
         Microsoft Office Web Apps Server 2013 Service Pack 1
         Microsoft SharePoint Enterprise Server 2013 Service Pack 1


IMPACT

        Microsoft has given the following details regarding these vulnerabilities.
        
         Details         Impact                   Severity
         CVE-2021-40442  Remote Code Execution    Important
         CVE-2021-41368  Remote Code Execution    Important
         CVE-2021-42292  Security Feature Bypass  Important
         CVE-2021-42296  Remote Code Execution    Important


MITIGATION

        Microsoft recommends updating the software with the version made
        available on the Microsoft Update Catalogue for the following
        Knowledge Base articles. [1].
        
         KB4486670, KB5002032, KB5002035, KB5002038, KB5002053
         KB5002056, KB5002063, KB5002065, KB5002072


REFERENCES

        [1] Microsoft Security Update Guidance
            https://portal.msrc.microsoft.com/en-us/security-guidance



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