Microsoft Office, Microsoft Office Services and Web Apps: CVSS (Max): 8.8

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                         AUSCERT Security Bulletin

                               ASB-2023.0006
           Microsoft Patch Tuesday update for Microsoft Office,
          Microsoft Office Services and Web Apps for January 2023
                              11 January 2023

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

Product:          Microsoft 365 Apps
                  Microsoft Office 2019
                  Microsoft Office 2019 for Mac
                  Microsoft Office LTSC 2021
                  Microsoft Office LTSC for Mac 2021
                  Microsoft SharePoint Enterprise Server 2013 Service Pack 1
                  Microsoft SharePoint Enterprise Server 2016
                  Microsoft SharePoint Foundation 2013 Service Pack 1
                  Microsoft SharePoint Server 2019
                  Microsoft SharePoint Server Subscription Edition
                  Microsoft Visio 2013 Service Pack 1
                  Microsoft Visio 2016
Operating System: Windows
                  macOS
Resolution:       Patch/Upgrade
CVE Names:        CVE-2023-21744 CVE-2023-21743 CVE-2023-21742
                  CVE-2023-21741 CVE-2023-21738 CVE-2023-21737
                  CVE-2023-21736 CVE-2023-21735 CVE-2023-21734

Comment: CVSS (Max):  8.8 CVE-2023-21742 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
         CVSS Source: Microsoft
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

OVERVIEW

        Microsoft has released its monthly security patch update for the
        month of January 2023.
        
        This update resolves 9 vulnerabilities across the following
        product(s): [1]
        
         Microsoft 365 Apps for Enterprise for 32-bit Systems
         Microsoft 365 Apps for Enterprise for 64-bit Systems
         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 SharePoint Enterprise Server 2013 Service Pack 1
         Microsoft SharePoint Enterprise Server 2016
         Microsoft SharePoint Foundation 2013 Service Pack 1
         Microsoft SharePoint Server 2019
         Microsoft SharePoint Server Subscription Edition
         Microsoft Visio 2013 Service Pack 1 (32-bit editions)
         Microsoft Visio 2013 Service Pack 1 (64-bit editions)
         Microsoft Visio 2016 (32-bit edition)
         Microsoft Visio 2016 (64-bit edition)


IMPACT

        Microsoft has given the following details regarding these vulnerabilities.
        
         Details         Impact                   Severity
         CVE-2023-21734  Remote Code Execution    Important
         CVE-2023-21735  Remote Code Execution    Important
         CVE-2023-21736  Remote Code Execution    Important
         CVE-2023-21737  Remote Code Execution    Important
         CVE-2023-21738  Remote Code Execution    Important
         CVE-2023-21741  Information Disclosure   Important
         CVE-2023-21742  Remote Code Execution    Important
         CVE-2023-21743  Security Feature Bypass  Critical
         CVE-2023-21744  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].
        
         KB5002329, KB5002331, KB5002332, KB5002335, KB5002336
         KB5002337, KB5002338


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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