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                         AUSCERT Security Bulletin

                               ASB-2021.0063
           Microsoft Patch Tuesday update for Microsoft Office,
           Microsoft Office Services and Web Apps for April 2021
                               14 April 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
                  Denial of Service               -- Existing Account            
                  Access Confidential Data        -- Existing Account            
Resolution:       Patch/Upgrade
CVE Names:        CVE-2021-28456 CVE-2021-28454 CVE-2021-28453
                  CVE-2021-28452 CVE-2021-28451 CVE-2021-28450
                  CVE-2021-28449  

OVERVIEW

        Microsoft has released its monthly security patch update for the
        month of April 2021.
        
        This update resolves 7 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 2010 Service Pack 2 (32-bit editions)
         Microsoft Excel 2010 Service Pack 2 (64-bit editions)
         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 2010 Service Pack 2 (32-bit editions)
         Microsoft Office 2010 Service Pack 2 (64-bit editions)
         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 2010 Service Pack 2
         Microsoft Office Web Apps Server 2013 Service Pack 1
         Microsoft Outlook 2010 Service Pack 2 (32-bit editions)
         Microsoft Outlook 2010 Service Pack 2 (64-bit editions)
         Microsoft Outlook 2013 RT Service Pack 1
         Microsoft Outlook 2013 Service Pack 1 (32-bit editions)
         Microsoft Outlook 2013 Service Pack 1 (64-bit editions)
         Microsoft Outlook 2016 (32-bit edition)
         Microsoft Outlook 2016 (64-bit edition)
         Microsoft SharePoint Enterprise Server 2013 Service Pack 1
         Microsoft SharePoint Enterprise Server 2016
         Microsoft SharePoint Foundation 2010 Service Pack 2
         Microsoft SharePoint Server 2010 Service Pack 2
         Microsoft SharePoint Server 2019
         Microsoft Word 2010 Service Pack 2 (32-bit editions)
         Microsoft Word 2010 Service Pack 2 (64-bit editions)
         Microsoft Word 2013 RT Service Pack 1
         Microsoft Word 2013 Service Pack 1 (32-bit editions)
         Microsoft Word 2013 Service Pack 1 (64-bit editions)
         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-2021-28449  Remote Code Execution    Important
         CVE-2021-28450  Denial of Service        Important
         CVE-2021-28451  Remote Code Execution    Important
         CVE-2021-28452  Remote Code Execution    Important
         CVE-2021-28453  Remote Code Execution    Important
         CVE-2021-28454  Remote Code Execution    Important
         CVE-2021-28456  Information Disclosure   Important


MITIGATION

        Microsoft recommends updating the software with the version made
        available on the Microsoft Update Catalogue for the following
        Knowledge Base articles. [1].
        
         KB2553491, KB2589361, KB3017810, KB3178639, KB3178643
         KB4493170, KB4493185, KB4493198, KB4493201, KB4493208
         KB4493215, KB4493218, KB4504701, KB4504705, KB4504709
         KB4504712, KB4504714, KB4504715, KB4504716, KB4504719
         KB4504721, KB4504722, KB4504723, KB4504724, KB4504726
         KB4504727, KB4504729, KB4504733, KB4504735, KB4504738
         KB4504739


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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