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                         AUSCERT Security Bulletin

                               ASB-2022.0082
        Microsoft Patch Tuesday update for Microsoft Office, Office
                   Services and Web Apps for April 2022
                               13 April 2022

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

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

Product:          365 Apps for Enterprise
                  Microsoft Excel
                  Microsoft Lync Server 2013 CU10
                  Microsoft Office
                  Microsoft SharePoint
                  Skype for Business Server
Operating System: Windows
Resolution:       Patch/Upgrade
CVE Names:        CVE-2022-26911 CVE-2022-26910 CVE-2022-26901
                  CVE-2022-24473 CVE-2022-24472 

Comment: CVSS (Max):  8.0 CVE-2022-24472 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:R/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 April 2022.
        
        This update resolves 5 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 Lync Server 2013 CU10
         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 2016
         Microsoft SharePoint Foundation 2013 Service Pack 1
         Microsoft SharePoint Server 2016
         Microsoft SharePoint Server 2019
         Microsoft SharePoint Server Subscription Edition
         Skype for Business Server 2015 CU12
         Skype for Business Server 2019 CU6


IMPACT

        Microsoft has given the following details regarding these vulnerabilities.
        
         Details         Impact                   Severity
         CVE-2022-24472  Spoofing                 Important
         CVE-2022-24473  Remote Code Execution    Important
         CVE-2022-26901  Remote Code Execution    Important
         CVE-2022-26910  Spoofing                 Important
         CVE-2022-26911  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].
        
         KB5002143, KB5002148, KB5002162, KB5002169, KB5002175
         KB5002177, KB5002180, KB5002183, KB5002189, KB5002191
         KB5012681, KB5012686


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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