Operating System:

[WIN]

Published:

11 August 2021

Protect yourself against future threats.

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                         AUSCERT Security Bulletin

                               ASB-2021.0168
           Microsoft Patch Tuesday update for Microsoft Office,
          Microsoft Office Services and Web Apps for August 2021
                              11 August 2021

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

Product:          Microsoft Office
                  Microsoft Office Services
                  Microsoft Web Apps
Operating System: Windows
Impact/Access:    Execute Arbitrary Code/Commands -- Existing Account
                  Provide Misleading Information  -- Existing Account
Resolution:       Patch/Upgrade
CVE Names:        CVE-2021-36941 CVE-2021-36940 CVE-2021-34478

OVERVIEW

        Microsoft has released its monthly security patch update for the
        month of August 2021.
        This update resolves 3 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 Office 2019 for 32-bit editions
         Microsoft Office 2019 for 64-bit editions
         Microsoft Office 2019 for Mac
         Microsoft SharePoint Enterprise Server 2013 Service Pack 1
         Microsoft SharePoint Enterprise Server 2016
         Microsoft SharePoint Server 2019


IMPACT

        Microsoft has given the following details regarding these vulnerabilities.
         Details         Impact                   Severity
         CVE-2021-34478  Remote Code Execution    Important
         CVE-2021-36940  Spoofing                 Important
         CVE-2021-36941  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].
         KB4011600, KB5002000, KB5002002


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.

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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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