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                         AUSCERT Security Bulletin

                               ASB-2021.0133
           Microsoft Patch Tuesday update for Microsoft Office,
           Microsoft Office Services and Web Apps for July 2021
                               14 July 2021

===========================================================================

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

Product:          Microsoft Office Products
                  Microsoft Office Services
                  Microsoft Web App Products
Operating System: Windows
                  Mac OS
Impact/Access:    Execute Arbitrary Code/Commands -- Remote with User Interaction
                  Provide Misleading Information  -- Remote/Unauthenticated      
                  Unauthorised Access             -- Remote with User Interaction
                  Access Confidential Data        -- Existing Account            
                  Reduced Security                -- Existing Account            
Resolution:       Patch/Upgrade
CVE Names:        CVE-2021-34520 CVE-2021-34519 CVE-2021-34518
                  CVE-2021-34517 CVE-2021-34501 CVE-2021-34469
                  CVE-2021-34468 CVE-2021-34467 CVE-2021-34452
                  CVE-2021-34451  

OVERVIEW

        Microsoft has released its monthly security patch update for the
        month of July 2021.
        
        This update resolves 10 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 Online Server
         Microsoft Office Web Apps Server 2013 Service Pack 1
         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 Word 2016 (32-bit edition)
         Microsoft Word 2016 (64-bit edition)


IMPACT

        Microsoft has given the following details regarding these vulnerabilities.
        
         Details         Impact                   Severity
         CVE-2021-34451  Spoofing                 Important
         CVE-2021-34452  Remote Code Execution    Important
         CVE-2021-34467  Remote Code Execution    Important
         CVE-2021-34468  Remote Code Execution    Important
         CVE-2021-34469  Security Feature Bypass  Important
         CVE-2021-34501  Remote Code Execution    Important
         CVE-2021-34517  Spoofing                 Important
         CVE-2021-34518  Remote Code Execution    Important
         CVE-2021-34519  Information Disclosure   Moderate
         CVE-2021-34520  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].
        
         KB5001949, KB5001973, KB5001975, KB5001976, KB5001977
         KB5001979, KB5001981, KB5001983, KB5001984, KB5001986
         KB5001992, KB5001993, KB5001996


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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