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AUSCERT Security Bulletin
ASB-2021.0118
Microsoft Patch Tuesday update for Microsoft Office,
Microsoft Office Services and Web Apps for June 2021
9 June 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft 365 Apps
Microsoft Excel
Microsoft Office
Microsoft Outlook
Microsoft SharePoint
Office Online Server
Operating System: Windows
Mac OS
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Provide Misleading Information -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31966 CVE-2021-31965 CVE-2021-31964
CVE-2021-31963 CVE-2021-31950 CVE-2021-31949
CVE-2021-31948 CVE-2021-31941 CVE-2021-31940
CVE-2021-31939 CVE-2021-26420
OVERVIEW
Microsoft has released its monthly security patch update for the
month of June 2021.
This update resolves 11 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 Web Apps Server 2013 Service Pack 1
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 2013 Service Pack 1
Microsoft SharePoint Server 2019
Office Online Server
IMPACT
Microsoft has given the following details regarding these vulnerabilities.
Details Impact Severity
CVE-2021-26420 Remote Code Execution Important
CVE-2021-31939 Remote Code Execution Important
CVE-2021-31940 Remote Code Execution Important
CVE-2021-31941 Remote Code Execution Important
CVE-2021-31948 Spoofing Important
CVE-2021-31949 Remote Code Execution Important
CVE-2021-31950 Spoofing Important
CVE-2021-31963 Remote Code Execution Critical
CVE-2021-31964 Spoofing Important
CVE-2021-31965 Information Disclosure Important
CVE-2021-31966 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].
KB4011698, KB5001922, KB5001934, KB5001939, KB5001942
KB5001943, KB5001944, KB5001945, KB5001946, KB5001947
KB5001950, KB5001951, KB5001953, KB5001954, KB5001955
KB5001956, KB5001962, KB5001963
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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