Microsoft & Adobe Patch Tuesday (May 2021) – Qualys covers 85 Vulnerabilities, 26 Critical

Microsoft Patch Tuesday – May 2021

Microsoft patched 55 CVEs in their May 2021 Patch Tuesday release, of which 4 are rated as critical severity. Three 0-day vulnerability patches were included in the release. As of this publication date, none have been exploited.

Qualys released 12 QIDs on the same day, providing vulnerability detection and patch management coverage (where applicable) for all 55 CVEs and the related KBs.

Critical Microsoft vulnerabilities patched:

CVE-2021-31181 – SharePoint Remote Code Execution Vulnerability

Microsoft released patches addressing a critical RCE vulnerability in SharePoint (CVE-2021-31181). This CVE has a high likelihood of exploitability and is assigned a CVSSv3 base score of 8.8 by the vendor.

CVE-2021-31166 – HTTP Protocol Stack Remote Code Execution Vulnerability

Microsoft released patches addressing a critical RCE vulnerability in Windows. This vulnerability allows an unauthenticated attacker to remotely execute code as kernel. This is a wormable vulnerability where an attacker can simply send a malicious crafted packet to the target impacted web-server. CVE has a high likelihood of exploitability and is assigned a CVSSv3 base score of 9.8 by the vendor.

CVE-2021-28476 – Hyper-V Remote Code Execution Vulnerability

Microsoft released patches addressing a critical RCE in Windows Server that impacts Hyper-V. Though the exploitation of this vulnerability is less likely (according to Microsoft), this should be prioritized for patching since adversaries can abuse this vulnerability and cause Denial of Service (DoS) in the form of a bug check. This CVE is assigned a CVSSv3 base score of 9.9 by the vendor.

Three 0-day vulnerabilities patched:

• CVE-2021-31204 – .NET and Visual Studio Elevation of Privilege Vulnerability
• CVE-2021-31207 – Microsoft Exchange Server Security Feature Bypass Vulnerability
• CVE-2021-31200 – Common Utilities Remote Code Execution Vulnerability

Qualys QIDs Providing Coverage

QID	Title	Severity	CVE ID
100415	Microsoft Internet Explorer Security Update for May 2021	Medium	CVE-2021-26419
91762	Microsoft SharePoint Enterprise Server Multiple Vulnerabilities May 2021	High	CVE-2021-31181 CVE-2021-31173 CVE-2021-31172 CVE-2021-31171 CVE-2021-26418 CVE-2021-28478 CVE-2021-28474
110381	Microsoft Office and Microsoft Office Services and Web Apps Security Update May 2021	High	CVE-2021-31180 CVE-2021-31179 CVE-2021-31178 CVE-2021-31177 CVE-2021-31176 CVE-2021-31175 CVE-2021-31174 CVE-2021-28455
110382	Microsoft Skype for Business Server Security and Lync Server Update for May 2021	High	CVE-2021-26421 CVE-2021-26422
375556	Visual Studio Code Remote Code Execution Vulnerability	High	CVE-2021-31214 CVE-2021-31211
375557	Visual Studio Code Remote Development for Containers Extension Remote Code Execution Vulnerability	Medium	CVE-2021-31213
50111	Microsoft Exchange Server Multiple Vulnerabilities – May 2021	High	CVE-2021-31209 CVE-2021-31207 CVE-2021-31198 CVE-2021-31195
91762	Microsoft Windows Security Update for May 2021	Critical	CVE-2021-31192 CVE-2021-31188 CVE-2021-31170 CVE-2021-28476 CVE-2021-31184 CVE-2021-31190 CVE-2021-31167 CVE-2021-31168 CVE-2021-31208 CVE-2021-31169 CVE-2021-31165 CVE-2021-1720 CVE-2021-28479 CVE-2021-31185 CVE-2021-31194 CVE-2021-31191 CVE-2021-31186 CVE-2021-31205 CVE-2021-31193 CVE-2021-31187 CVE-2020-26144 CVE-2020-24587 CVE-2020-24588
91763	Microsoft Visual Studio Security Update for May 2021	High	CVE-2021-27068 CVE-2021-31204
91764	Microsoft Windows Web Media Extensions Remote Code Execution Vulnerability	High	CVE-2021-28465
91766	Microsoft .NET Core Security Update May 2021	Medium	CVE-2021-31204
91767	Microsoft Windows HTTP Protocol Stack Remote Code Execution Vulnerability – May 2021	Critical	CVE-2021-31166

Adobe Patch Tuesday – May 2021

Adobe addressed 46 CVEs this Patch Tuesday, of which 26 are rated as critical severity, including one critical 0-day (CVE-2021-28550) impacting Adobe Acrobat and Reader product.

Adobe products patches include the following: Experience Manager, InDesign, Illustrator, InCopy, Genuine Service, Acrobat and Reader, Magento, Creative Cloud Desktop Application, Media Encoder, After Effects, Medium, and Animate products.

Qualys released 5 QIDs on the same day, providing vulnerability detection for 30 of the 46 CVEs, including 8 rated as critical.

One 0-day vulnerability patched:

CVE-2021-28550

This is a Remote Code Execution vulnerability impacting Adobe Acrobat and Reader and is being actively exploited in the wild on Windows devices. Adversaries are able to execute arbitrary code in windows, including installing malicious applications and gaining complete access to target machines.

Adobe Security Bulletin	QID	Severity	CVE ID
APSB21-22 Security updates available for Adobe InDesign	375549	Critical Critical Critical	CVE-2021-21098 CVE-2021-21099 CVE-2021-21043
APSB21-24 Security update available for Adobe Illustrator	375551	Critical Critical Critical Critical Critical	CVE-2021-21101 CVE-2021-21103 CVE-2021-21104 CVE-2021-21105 CVE-2021-21102
APSB21-29 Security update available for Adobe Acrobat and Reader	375547	Important Critical Important Critical Important Critical Critical Critical Critical Critical Important Critical Critical Critical	CVE-2021-28561 CVE-2021-28560 CVE-2021-28558 CVE-2021-28557 CVE-2021-28555 CVE-2021-28565 CVE-2021-28564 CVE-2021-21044 CVE-2021-21038 CVE-2021-21086 CVE-2021-28559 CVE-2021-28562 CVE-2021-28550 CVE-2021-28553
APSB21-32 Security update available for Adobe Media Encoder	375550	Important	CVE-2021-28569
APSB21-35 Security update available for Adobe Animate7	375553	Important Important Important Important Important Critical Critical	CVE-2021-28572 CVE-2021-28573 CVE-2021-28574 CVE-2021-28575 CVE-2021-28576 CVE-2021-28578 CVE-2021-28577

Discover Patch Tuesday Vulnerabilities in VMDR

Qualys VMDR automatically detects new Patch Tuesday vulnerabilities using continuous updates to its Knowledge Base (KB).

You can see all your impacted hosts by these vulnerabilities using the following QQL query:

vulnerabilities.vulnerability:(qid:`50111` OR qid:`91762` OR qid:`91763` OR qid:`91764` OR qid:`91766` OR qid:`91767` OR qid:`100415` OR qid:`110380` OR qid:`110381` OR qid:`110382` OR qid:`375547` OR qid:`375549` OR qid:`375550` OR qid:`375551` OR qid:`375553` OR qid:`375556` OR qid:`375557`)

Respond by Patching

VMDR rapidly remediates Windows hosts by deploying the most relevant and applicable per-technology version patches. You can simply select respective QIDs in the Patch Catalog and filter on the “Missing” patches to identify and deploy the applicable, available patches in one go.

The following QQL will return the missing patches pertaining to this Patch Tuesday.

qid:`50111` OR qid:`91762` OR qid:`91763` OR qid:`91764` OR qid:`91766` OR qid:`91767` OR qid:`100415` OR qid:`110380` OR qid:`110381` OR qid:`110382` OR qid:`375547` OR qid:`375549` OR qid:`375550` OR qid:`375551` OR qid:`375553` OR qid:`375556` OR qid:`375557`

Patch Tuesday Dashboard

The current updated Patch Tuesday dashboards are available in Dashboard Toolbox: 2021 Patch Tuesday Dashboard.

Webinar Series: This Month in Patches

To help customers leverage the seamless integration between Qualys VMDR and Patch Management and reduce the median time to remediate critical vulnerabilities, the Qualys Research team is hosting a monthly webinar series This Month in Patches.

We discuss some of the key vulnerabilities disclosed in the past month and how to patch them:

• 21Nails Exim Mail Server Multiple Vulnerabilities
• Pulse Connect Secure Remote Code Execution Vulnerability (CVE-2021-22893)
• Microsoft Patch Tuesday, May 2021

Join us live or watch on demand!

About Patch Tuesday

Patch Tuesday QIDs are published at Security Alerts, typically late in the evening of Patch Tuesday, followed shortly after by PT dashboards.