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AUSCERT Security Bulletin
ASB-2021.0110
Microsoft Patch Tuesday update for Extended Security Update for May 2021
12 May 2021
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AusCERT Security Bulletin Summary
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Product: Internet Explorer 9
Windows 7
Windows Server 2008 R2
Windows Server 2008
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Increased Privileges -- Existing Account
Provide Misleading Information -- Remote/Unauthenticated
Denial of Service -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31194 CVE-2021-31193 CVE-2021-31188
CVE-2021-31186 CVE-2021-31184 CVE-2021-31182
CVE-2021-28476 CVE-2021-28455 CVE-2021-26419
CVE-2020-26144 CVE-2020-24588 CVE-2020-24587
Reference: ASB-2021.0104
ASB-2021.0102
ESB-2021.1587
OVERVIEW
Microsoft has released its monthly security patch update for the
month of May 2021.
This update resolves 12 vulnerabilities across the following
products: [1]
Internet Explorer 9
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
IMPACT
Microsoft has given the following details regarding these vulnerabilities.
Details Impact Severity
CVE-2020-24587 Information Disclosure Important
CVE-2020-24588 Spoofing Important
CVE-2020-26144 Spoofing Important
CVE-2021-26419 Remote Code Execution Critical
CVE-2021-28455 Remote Code Execution Important
CVE-2021-28476 Remote Code Execution Critical
CVE-2021-31182 Spoofing Important
CVE-2021-31184 Information Disclosure Important
CVE-2021-31186 Information Disclosure Important
CVE-2021-31188 Elevation of Privilege Important
CVE-2021-31193 Elevation of Privilege Important
CVE-2021-31194 Remote Code Execution Critical
MITIGATION
Microsoft recommends updating the software with the version made
available on the Microsoft Update Catalogue for the following
Knowledge Base articles. [1].
KB5003165, KB5003210, KB5003225, KB5003228, KB5003233
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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