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                         AUSCERT Security Bulletin

                               ASB-2021.0234
          Microsoft Patch Tuesday update for Microsoft Office and
         Microsoft Office Services and Web Apps for November 2021
                             10 November 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

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

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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