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AUSCERT Security Bulletin
ASB-2021.0231
Microsoft Patch Tuesday update for Microsoft Exchange Server
for November 2021
10 November 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Exchange Server
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-42321 CVE-2021-42305 CVE-2021-41349
Comment: Microsoft is aware that exploits for CVE-2021-42321 exist in the wild.
OVERVIEW
Microsoft has released its monthly security patch update for the
month of November 2021.
This update resolves 3 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-2021-41349 Spoofing Important
CVE-2021-42305 Spoofing Important
CVE-2021-42321 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 article. [1].
KB5007409
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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