2021 October Patch Tuesday

Patch Tuesday Webinar
Wednesday, October 13, 2021
Hosted by Chris Goettl and Todd Schell

Agenda
October 2021 Patch Tuesday Overview
In the News
Bulletins and Releases
Between Patch Tuesdays
Q & A

Copyright © 2021 Ivanti. All rights reserved.
October Patch Tuesday 2021
October is cyber security awareness month. It is a great time to evaluate your vulnerability management
prioritization process. Vulnerability management is always an area of concern as new vulnerabilities are
constantly being discovered. Vendor severity and CVSS scores often do not account for real world risk. This
month has some good examples including a Zero Day vulnerability that is actively being exploited but is only
rated as Important. Patch Tuesday is a specific event each month that helps companies focus on resolving
Microsoft operating systems and vulnerabilities. The challenge is the other software in your environment
receives updates on a different release cycle, so you need to account for this all month. Microsoft has resolved
76 unique CVEs this month. Adobe has released an update for Acrobat and Reader resolving four CVEs, Foxit
Reader has resolved 13 CVEs, and next week Oracle will be releasing their Quarterly CPU.

In the News
 Apache is Critical to your Web Site Security
 https://www.bankinfosecurity.com/apache-issues-another-
emergency-patch-for-exploited-flaws-a-17697
 https://us-cert.cisa.gov/ncas/current-
activity/2021/10/06/apache-releases-security-update-apache-
http-server
 https://nvd.nist.gov/vuln/detail/CVE-2021-40438
 Atlassian Confluence
 https://www.zdnet.com/article/us-cybercom-says-mass-
exploitation-of-atlassian-confluence-vulnerability-ongoing-and-
expected-to-accelerate/

In the News
 Apple fixes 17th Zero Day in iOS
 https://thehackernews.com/2021/10/apple-releases-urgent-iphone-and-
ipad.html?m=1
 Oracle CPU
 Quarterly release of all updates for Oracle products
 October 19
 https://www.oracle.com/security-alerts/

Exploited Vulnerability
 CVE-2021-40449 Win32k Elevation of Privilege Vulnerability
 CVSS 3.0 Scores: 7.8 / 7.2
 Severity: Important
 Impacts all Microsoft workstation and server operating systems
 https://www.bleepingcomputer.com/news/security/chinese-hackers-use-windows-zero-
day-to-attack-defense-it-firms/

Publicly Disclosed Vulnerabilities
 CVE-2021-33781 Azure AD Security Feature Bypass Vulnerability
 Vulnerability fix originally released Jul 13
 Security updates released for all supported versions of Windows 10 and 11, and
associated Server versions
 CVSS 3.0 Scores: 8.1 / 7.1
 CVE-2021-40469 Windows DNS Server Remote Code Execution
Vulnerability
 CVSS 3.0 Scores: 7.2 / 6.5
 Impacts all Server operating systems

Publicly Disclosed Vulnerabilities
 CVE-2021-41335 Windows Kernel Elevation of Privilege Vulnerability
 CVSS 3.0 Scores: 7.8 / 7.0
 Impacts all Workstation and Server versions from Server 2008 R2 through Windows
Server 21H2
 CVE-2021-41338 Windows AppContainer Firewall Rules Security
Feature Bypass Vulnerability
 CVSS 3.0 Scores: 5.5 / 5.0
 Impacts Windows 10, Windows 11, and associated Server versions

Advisory 990001 Latest Servicing Stack Updates (SSU)
 https://msrc.microsoft.com/update-guide/en-US/vulnerability/ADV990001
Source: Microsoft

Microsoft Patch Tuesday Updates of Interest
 Development Tool and Other Updates
 .NET 5.0
 Intune Management Extension
 Visual Studio 2017 version 15.9
 Visual Studio 2019 versions 16.0 through 16.10

Windows 10 and 11 Lifecycle Awareness
Windows 10 Enterprise and Education
Version Release Date End of Support Date
21H1 5/18/2021 12/13/2022
20H2 10/20/2020 5/9/2023
2004 5/27/2020 12/14/2021
1909 11/12/2019 5/10/2022
Windows 10 Pro and Pro Workstation
21H1 5/18/2021 12/13/2022
20H2 10/20/2020 5/10/2022
2004 5/27/2020 12/14/2021
Windows Datacenter and Standard Server
20H2 10/20/2020 5/10/2022
2004 5/27/2020 12/14/2021
Windows 11 Home and Pro
21H2 10/4/2021 10/10/2023
 Lifecycle Fact Sheet
 https://docs.microsoft.com/en-us/lifecycle/faq/windows

Server 2012/2012 R2 EOL is Coming
 Lifecycle Fact Sheet
 https://docs.microsoft.com/en-us/lifecycle/products/windows-server-2012-r2

Patch Content Announcements
 Announcements Posted on Community Forum Pages
 https://forums.ivanti.com/s/group/CollaborationGroup/00Ba0000009oKICEA2
 Subscribe to receive email for the desired product(s)

APSB21-104: Security Update for Adobe Acrobat and Reader
 Maximum Severity: Critical
 Affected Products: Adobe Acrobat and Reader (all current versions)
 Description: Adobe has released security updates for Adobe Acrobat and Reader for
Windows and macOS. These updates address 4 vulnerabilities, 2 of which are critical.
Successful exploitation could lead to arbitrary code execution in the context of the
current user. See https://helpx.adobe.com/security/products/acrobat/apsb21-55.html
for more details.
 Impact: Remote Code Execution and Elevation of Privilege
 Fixes 4 Vulnerabilities: CVE-2021-40728, CVE-2021-40729, CVE-2021-40730,
CVE-2021-40731
 Restart Required: Requires application restart

FPDFE-211012: Security Update Foxit PDF Reader and Editor
 Affected Products: Foxit PDF Reader 11.1 and Foxit PDF Editor 11.1
 Description: Foxit has released security updates for PDF Reader and Editor for
Windows and macOS. These updates address 13 vulnerabilities. See
https://www.foxit.com/support/security-bulletins.html for more details.
 Impact: Remote Code Execution, Security Feature Bypass, Denial of Service and
Information Disclosure

MS21-10-W11: Windows 11 Update
 Affected Products: Microsoft Windows 11 Version 21H2 and Edge Chromium
 Description: This bulletin references KB 5006674.
 Impact: Remote Code Execution, Security Feature Bypass, Denial of Service,
Spoofing, Elevation of Privilege and Information Disclosure
 Fixes 39 Vulnerabilities: CVE-2021-40449 is known exploited. CVE-2021-41338
is publicly disclosed. See the Security Update Guide for the complete list of CVEs.
 Restart Required: Requires restart
 Known Issues: None reported

MS21-10-W10: Windows 10 Update
 Affected Products: Microsoft Windows 10 Versions 1607, 1809, 1909, 2004, 20H2,
21H1, Server 2016, Server 2019, Server 2022, Server version 1909, Server version
2004, Server version 20H2, Server 21H1, IE 11, and Edge Chromium
 Description: This bulletin references 6 KB articles. See KBs for the list of changes.
 Fixes 47 Vulnerabilities: CVE-2021-40449 is known exploited. CVE-2021-40469,
CVE-2021-41335, and CVE-2021-41338 are publicly disclosed. See the Security
Update Guide for the complete list of CVEs.
 Known Issues: See next slides

October Known Issues for Windows 10
 KB 5006672 – Windows 10 Enterprise 2019 LTSC, Windows 10 IoT
Enterprise 2019 LTSC, Windows 10 IoT Core 2019 LTSC, Windows
Server 2019
 [Asian Packs] After installing KB 4493509, devices with some Asian language
packs installed may receive the error, "0x800f0982 -
PSFX_E_MATCHING_COMPONENT_NOT_FOUND.“ Workaround: Uninstall
and reinstall any recently added language packs or select Check for Updates and
install the April 2019 Cumulative Update. See KB for more recovery details.
Microsoft is working on a resolution.
 [Cluster Update] After installing KB 5001342 or later, the Cluster Service might fail
to start because a Cluster Network Driver is not found. Workaround: This issue
occurs because of an update to the PnP class drivers used by this service. After
about 20 minutes, you should be able to restart your device and not encounter this
issue. For more information about the specific errors, cause, and workaround for
this issue, please see KB 5003571.

October Known Issues for Windows 10 (cont)
 KB 5006670 – Windows 10 version 2004, Windows Server version
2004, Windows 10 version 20H2, Windows Server version 20H2,
Windows 10 version 21H1
 [Scavaged] After installing the June 21, 2021 (KB5003690) update, some devices
cannot install new updates, such as the July 6, 2021 (KB5004945) or later
updates. You will receive the error message,
"PSFX_E_MATCHING_BINARY_MISSING". Workaround: In place upgrade. For
more information and a workaround, see KB5005322.
 [Edge Removed] Devices with Windows installations created from custom offline
media or custom ISO image might have Microsoft Edge Legacy removed by this
update, but not automatically replaced by the new Microsoft Edge. Devices that
connect directly to Windows Update to receive updates are not affected.
Workaround: Slipstream the SSU released March 29, 2021 or later into the
custom offline media or ISO image before slipstreaming the LCU. See KB for
details.

MS21-10-SPT: Security Updates for SharePoint Server
 Affected Products: Microsoft SharePoint Foundation Server 2013, Microsoft
SharePoint Enterprise Server 2013, Microsoft SharePoint Enterprise Server 2016, and
Microsoft SharePoint Server 2019
 Description: This security update resolves vulnerabilities in Microsoft Office that
could allow remote code execution if a user opens a specially crafted Office file. This
bulletin is based on 6 KBs.
 Impact: Remote Code Execution, Spoofing and Information Disclosure
 Fixes 7 Vulnerabilities: No vulnerabilities are publicly disclosed or known
exploited. CVE-2021-40482, CVE-2021-40483, CVE-2021-40484, CVE-2021-40485,
CVE-2021-40486, CVE-2021-40487, and CVE-2021-41344 are fixed in this release.

MS21-10-OFF: Security Updates for Microsoft Office
 Affected Products: Excel 2013 & 2016, Office 2013 & 2016, Office 2019 and LTSC
2021 for macOS, Office Online Server, Office Web Apps Server 2013 and Word 2013
& 2016
 Description: This security update resolves multiple vulnerabilities in Microsoft Office
applications. Consult the Security Update Guide for specific details on each. This
bulletin references just the release notes for the macOS Office.
 Impact: Remote Code Execution and Information Disclosure
CVE-2021-40474, CVE-2021-40479, CVE-2021-40485, and CVE-2021-40486 are
fixed in this release.

MS21-10-O365: Security Updates Microsoft 365 Apps, Office 2019
and Office LTSC 2021
 Affected Products: Microsoft 365 Apps, Office 2019, Office LTSC 2021
 Description: This month’s update resolved various bugs and performance issues in
Office applications. Information on the security updates is available at
https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates.
 Impact: Remote Code Execution and Information Disclosure
CVE-2021-40474, CVE-2021-40479, CVE-2021-40480, CVE-2021-40481, CVE-2021-
40485, and CVE-2021-40486 are fixed in this release.

MS21-10-IE: Security Updates for Internet Explorer
 Maximum Severity: Important
 Affected Products: Internet Explorer 9 and 11
 Description: The fixes that are included in this update are also included in the
October 2021 Security Monthly Quality Rollup. Installing either this update or the
Security Monthly Quality Rollup installs the same fixes. This bulletin references KB
5006671.
 Impact: Remote Code Execution
 Fixes 1 Vulnerability: CVE-2021-41342 is fixed in this update.
 Restart Required: Requires browser restart

MS21-10-EXCH: Security Updates for Exchange Server
 Affected Products: Microsoft Exchange Server 2013 - 2019
 Description: This security update fixes vulnerabilities in Microsoft
Exchange. This bulletin is based on KB 5007011 and KB 5007012.
 Impact: Remote Code Execution, Denial of Service, Spoofing, and
Elevation of Privilege
 Fixes 4 Vulnerabilities: None are publicly disclosed or known
exploited. CVE-2021-26427, CVE-2021-34453, CVE-2021-41348,
and CVE-2021-41350 are fixed in this release.
 Known Issues: See next slide

October Known Issues for Exchange Server
 KB 5007011 and KB 5007012 – Exchange Server 2013, 2016 and 2019
 [Issue 1] If the update is run it in Normal mode (that is, not as an administrator),
some files are not correctly updated and there are no error messages. This occurs
because UAC prevents the security update from correctly stopping certain
Exchange-related services. Workaround: Run as administrator in manual mode.
See KB for more details.
 [Issue 2] Exchange services might remain in a disabled state after you install this
security update. Workaround: Use Services Manager to restore the startup type
to Automatic, and then start the affected Exchange services manually. To avoid this
issue, run the security update at an elevated command prompt.
 [Issue 3] When you block third-party cookies in a web browser, you might be
continually prompted to trust a particular add-in even though you keep selecting
the option to trust it. Workaround: Enable third-party cookies for the domain
that's hosting OWA or Office Online Server in the browser settings. See KB for
more details.

October Known Issues for Exchange Server (cont)
 [Issue 4] When you try to request free/busy information for a user in a different
forest in a trusted cross-forest topology, the request fails and generates a "(400)
Bad Request" error message. Workaround: See Microsoft help article "(400) Bad
Request" error during Autodiscover for per-user free/busy in a trusted cross-forest
topology for guidance.

MS21-10-MR2K8-ESU: Monthly Rollup for Windows Server 2008
 Affected Products: Microsoft Windows Server 2008 and IE 9
 Description: This security update includes improvements and fixes that were a part
of update KB 5005606 (released September 14, 2021). This update contains
miscellaneous security improvements to internal OS functionality. No additional issues
were documented for this release. Bulletin is based on KB 5006736.
 Impact: Remote Code Execution, Spoofing, Denial of Service, Elevation of Privilege,
and Information Disclosure
 Known Issues: [File Rename] See next slide.

October Known Issues for Server 2008
 KB 5006736 – Windows Server 2008 (Monthly Rollup)
 [File Rename] Certain operations, such as rename, that you perform on files or
folders that are on a Cluster Shared Volume (CSV) may fail with the error,
“STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you
perform the operation on a CSV owner node from a process that doesn’t have
administrator privilege. Workaround: Perform the operation from a process that
has administrator privilege or perform the operation from a node that doesn’t have
CSV ownership. Microsoft is working on a resolution.
 KB 5006715 – Windows Server 2008 (Security-only Update)
 [File Rename]

MS21-10-SO2K8-ESU: Security-only Update for Windows Server 2008
 Affected Products: Microsoft Windows Server 2008
 Description: Bulletin is based on KB 5006715. This update contains miscellaneous
security improvements to internal OS functionality. No additional issues were
documented for this release.
 Impact: Remote Code Execution, Spoofing, Denial of Service, Elevation of Privilege,
and Information Disclosure
 Known Issues: [File Rename] See previous slide.

MS21-10-MR7-ESU: Monthly Rollup for Win 7
MS21-10-MR2K8R2-ESU Monthly Rollup for Server 2008 R2
 Affected Products: Microsoft Windows 7, Server 2008 R2, and IE 11
 Description: This security update includes improvements and fixes that were a part of
update KB 5005633 (released September 14, 2021). This update contains miscellaneous
documented for this release. Bulletin is based on KB 5006743.
 Impact: Remote Code Execution, Security Feature Bypass, Spoofing, Denial of
Service, Elevation of Privilege, and Information Disclosure
 Fixes 20 Vulnerabilities: CVE-2021-40449 is known exploited. CVE-2021-40469 and
CVE-2021-41335 are publicly disclosed. See the Security Update Guide for the complete
list of CVEs.
 Known Issues: [File Rename]

MS21-10-SO7-ESU: Security-only Update for Win 7
MS21-10-SO2K8R2-ESU: Security-only Update for Server 2008 R2
 Affected Products: Microsoft Windows 7 and Server 2008 R2
 Impact: Remote Code Execution, Security Feature Bypass, Spoofing, Denial of
Service, Elevation of Privilege, and Information Disclosure
and CVE-2021-41335 are publicly disclosed. See the Security Update Guide for the
complete list of CVEs.

MS21-10-MR8: Monthly Rollup for Server 2012
 Affected Products: Microsoft Windows Server 2012 and IE
 Description: This security update includes improvements and fixes that were a part of
update KB 5005623 (released September 14, 2021). This update contains miscellaneous
security improvements to internal OS functionality. No additional issues were documented
for this release. Bulletin is based on KB 5006739.
 Impact: Remote Code Execution, Security Feature Bypass, Denial of Service, Spoofing,
Elevation of Privilege and Information Disclosure
 Fixes 28 Vulnerabilities: CVE-2021-40449 is known exploited. CVE-2021-40469 and
CVE-2021-41335 are publicly disclosed. See the Security Update Guide for the complete
list of CVEs.

MS21-10-SO8: Security-only Update for Windows Server 2012
 Affected Products: Microsoft Windows Server 2012

MS21-10-MR81: Monthly Rollup for Win 8.1 and Server 2012 R2
 Affected Products: Microsoft Windows 8.1, Server 2012 R2, and IE
 Description: This security update includes improvements and fixes that were a part of update
KB 5005623 (released September 14, 2021). This update contains miscellaneous security
improvements to internal OS functionality. No additional issues were documented for this
release. Bulletin is based on KB 5006714.
 Impact: Remote Code Execution, Security Feature Bypass, Denial of Service, Spoofing,
Elevation of Privilege and Information Disclosure
 Fixes 28 Vulnerabilities: CVE-2021-40449 is known exploited. CVE-2021-40469 and CVE-
2021-41335 are publicly disclosed. See the Security Update Guide for the complete list of CVEs.

MS21-10-SO81: Security-only Update for Win 8.1 and Server 2012 R2
 Affected Products: Microsoft Windows 8.1, Server 2012 R2

Release Summary
 Security Updates (with CVEs): iTunes (1), Google Chrome (4), Firefox (1), Firefox
ESR (2), Apache OpenOffice (1)
 Security (w/o CVEs): iTunes (1), Apple Mobile Device Support (1), Adobe Acrobat DC and
Acrobat (1), Box Edit (1), Camtasia (2), ClickShare App Machine-Wide Installer (1), Falcon Sensor
for Windows (1), Citrix Workspace App (2), Dropbox (1), Evernote (3), Firefox (1), GoodSync (4),
GIMP (1), GIT for Windows (1), Jabra Direct (1), LibreOffice (1), Malwarebytes (2), Node.JS (2),
Notepad++ (1), Opera (5), Pidgin (1), Plex Media Server (1), Royal TS (1), Skype (1), Slack
Machine-Wide Installer (1), Snagit (1), Tableau Desktop (5), Tableau Reader (1), Thunderbird (3),
Apache Tomcat (1), TeamViewer (1), UltraVNC (1), VMware Tools (1), Wireshark (2), Zoom Client
(1), Zoom Outlook Plugin (1)
 Non-Security Updates: Box Drive (1), Box Sync (1), Docker for Windows Stable (2),
Google Drive File Stream (1), Inkscape (1), BlueJeans (2), RingCentral App (Machine-Wide
Installer) (1), Rocket.Chat Desktop Client (4), TightVNC (1), Cisco WebEx Teams (1), XnView (1)

Third Party CVE Information
 iTunes 12.12.0.6
 AI-210920, QAI121206
 Fixes 2 Vulnerabilities: CVE-2021-30835, CVE-2021-30847
 Google Chrome 94.0.4606.54
 CHROME-210921, QGC940460654
CVE-2021-37959, CVE-2021-37960, CVE-2021-37961, CVE-2021-37962, CVE-
2021-37963, CVE-2021-37964, CVE-2021-37965, CVE-2021-37966, CVE-2021-
37967, CVE-2021-37968, CVE-2021-37969, CVE-2021-37970, CVE-2021-37971,
CVE-2021-37972

Third Party CVE Information (cont)
 CHROME-210924, QGC940460661
 Fixes 1 Vulnerability: CVE-2021-37973
 CHROME-210930, QGC940460671
 Fixes 3 Vulnerabilities: CVE-2021-37974, CVE-2021-37975, CVE-2021-37976
 CHROME-211007, QGC940460681
CVE-2021-37980

 Firefox ESR 93.0
 FFE-211005, QFF93
CVE-2021-38498, CVE-2021-38499, CVE-2021-38500, CVE-2021-38501
 Firefox ESR 91.2.0
 FFE-211004, QFFE9120
CVE-2021-38498, CVE-2021-38500, CVE-2021-38501
 Firefox ESR 78.15.0
 FFE-211005, QFFE78150
 Fixes 2 Vulnerabilities: CVE-2021-38496, CVE-2021-38500

 Apache OpenOffice 4.1.11
 OROO-211006, QOROO4111
 Fixes 3 Vulnerabilities: CVE-2021-28129, CVE-2021-33035, CVE-2021-40439

Thank You!

2021 October Patch Tuesday

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