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AUSCERT Security Bulletin
ASB-2021.0186
Microsoft Patch Tuesday update for Microsoft Office,
Microsoft Office Services and Web Apps for September 2021
15 September 2021
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AusCERT Security Bulletin Summary
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Product: Microsoft 365 Apps for Enterprise
Microsoft Excel
Microsoft Office
Microsoft Office Online Server
Microsoft Office Web Apps Server
Microsoft SharePoint Enterprise Server
Microsoft SharePoint Foundation
Microsoft SharePoint Server
Operating System: Windows
Mac OS
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Provide Misleading Information -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-38660 CVE-2021-38659 CVE-2021-38658
CVE-2021-38657 CVE-2021-38656 CVE-2021-38655
CVE-2021-38654 CVE-2021-38653 CVE-2021-38652
CVE-2021-38651 CVE-2021-38650 CVE-2021-38646
OVERVIEW
Microsoft has released its monthly security patch update for the
month of September 2021.
This update resolves 12 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 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 2016
Microsoft SharePoint Foundation 2013 Service Pack 1
Microsoft SharePoint Server 2019
IMPACT
Microsoft has given the following details regarding these vulnerabilities.
Details Impact Severity
CVE-2021-38646 Remote Code Execution Important
CVE-2021-38650 Spoofing Important
CVE-2021-38651 Spoofing Important
CVE-2021-38652 Spoofing Important
CVE-2021-38653 Remote Code Execution Important
CVE-2021-38654 Remote Code Execution Important
CVE-2021-38655 Remote Code Execution Important
CVE-2021-38656 Remote Code Execution Important
CVE-2021-38657 Remote Code Execution Important
CVE-2021-38658 Remote Code Execution Important
CVE-2021-38659 Remote Code Execution Important
CVE-2021-38660 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].
KB4484103, KB4484108, KB5001958, KB5001997, KB5001999
KB5002003, KB5002005, KB5002007, KB5002009, KB5002014
KB5002018, KB5002020, KB5002024
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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