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AUSCERT Security Bulletin
ASB-2021.0197
Microsoft Patch Tuesday update for Microsoft Exchange Server
for October 2021
13 October 2021
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AusCERT Security Bulletin Summary
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Product: Microsoft Exchange Server 2013
Microsoft Exchange Server 2016
Microsoft Exchange Server 2019
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-41350 CVE-2021-41348 CVE-2021-34453
CVE-2021-26427
OVERVIEW
Microsoft has released its monthly security patch update for the
month of October 2021.
This update resolves 4 vulnerabilities across the following products:
[1]
Microsoft Exchange Server 2013 Cumulative Update 23
Microsoft Exchange Server 2016 Cumulative Update 21
Microsoft Exchange Server 2016 Cumulative Update 22
Microsoft Exchange Server 2019 Cumulative Update 10
Microsoft Exchange Server 2019 Cumulative Update 11
IMPACT
Microsoft has given the following details regarding these vulnerabilities.
Details Impact Severity
CVE-2021-26427 Remote Code Execution Important
CVE-2021-34453 Denial of Service Important
CVE-2021-41348 Elevation of Privilege Important
CVE-2021-41350 Spoofing Important
MITIGATION
Microsoft recommends updating the software with the version made
available on the Microsoft Update Catalogue for the following
Knowledge Base articles. [1].
KB5007011, KB5007012
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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