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AUSCERT Security Bulletin
ASB-2021.0191
Microsoft Patch Tuesday update for Microsoft Office,
Microsoft Office Services and Web Apps for September 2021
13 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft 365 Apps for Enterprise
Microsoft Excel 2013
Microsoft Excel 2016
Microsoft Office 2013
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office LTSC 2021
Microsoft Office LTSC for Mac 2021
Microsoft Office Online Server
Microsoft Office Web Apps Server 2013
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Foundation 2013
Microsoft SharePoint Server 2019
Microsoft Word 2013
Microsoft Word 2016
Operating System: Windows
macOS
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Provide Misleading Information -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-41344 CVE-2021-40487 CVE-2021-40486
CVE-2021-40485 CVE-2021-40484 CVE-2021-40483
CVE-2021-40482 CVE-2021-40481 CVE-2021-40480
CVE-2021-40479 CVE-2021-40474 CVE-2021-40473
CVE-2021-40472 CVE-2021-40471 CVE-2021-40454
OVERVIEW
Microsoft has released its monthly security patch update for the
month of October 2021.
This update resolves 15 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 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 2013 Service Pack 1
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Foundation 2013 Service Pack 1
Microsoft SharePoint Server 2019
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-2021-40454 Information Disclosure Important
CVE-2021-40471 Remote Code Execution Important
CVE-2021-40472 Information Disclosure Important
CVE-2021-40473 Remote Code Execution Important
CVE-2021-40474 Remote Code Execution Important
CVE-2021-40479 Remote Code Execution Important
CVE-2021-40480 Remote Code Execution Important
CVE-2021-40481 Remote Code Execution Important
CVE-2021-40482 Information Disclosure Important
CVE-2021-40483 Spoofing Low
CVE-2021-40484 Spoofing Important
CVE-2021-40485 Remote Code Execution Important
CVE-2021-40486 Remote Code Execution Critical
CVE-2021-40487 Remote Code Execution Important
CVE-2021-41344 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].
KB4018332, KB4461476, KB4493202, KB5001924, KB5001960
KB5001982, KB5001985, KB5002004, KB5002006, KB5002027
KB5002028, KB5002029, KB5002030, KB5002036, KB5002042
KB5002043
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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