Threat Level: green Handler on Duty: Xavier Mertens

SANS ISC: Microsoft July 2021 Patch Tuesday SANS ISC InfoSec Forums

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Microsoft July 2021 Patch Tuesday

This month we got patches for 117 vulnerabilities. Of these, 13 are critical, 6 were previously disclosed and 4 are being exploited according to Microsoft.

The known Printnightmare vulnerability (CVE-2021-34527) is one of the 4 exploited. Microsoft released an out of bound emergency security fix for it (KB5004945) on July 6 but it  is worth stressing the importance of applying this update. Remember to confirm if the PointAndPrint Windows registry is set to zero as well. Please, refer to the security advisory and a diary from Johannes detailing the vulnerability. 

The other 3 exploited vulnerabilities comprises two elevation of privilege affecting Windows Kernel (CVE-2021-31979 and CVE-2021-33771) and a remote code execution (RCE) affecing Windows Scripting Engine.

About the previously disclosed vulnerabilities, it's worth mentioning two affecting Microsoft Exchange Server. One RCE (CVE-2021-34473) associated to a CVSS of 9.1 - the highest this month - and an elevation of privilege vulnerability (CVE-2021-34523) witn a CVSS of 9.0. 

See my dashboard for a more detailed breakout: https://patchtuesdaydashboard.com/

Description
CVE Disclosed Exploited Exploitability (old versions) current version Severity CVSS Base (AVG) CVSS Temporal (AVG)
Active Directory Security Feature Bypass Vulnerability
CVE-2021-33781 Yes No Less Likely Less Likely Important 8.1 7.1
Bowser.sys Denial of Service Vulnerability
CVE-2021-34476 No No Less Likely Less Likely Important 7.5 6.5
DirectWrite Remote Code Execution Vulnerability
CVE-2021-34489 No No Less Likely Less Likely Important 7.8 6.8
Dynamics Business Central Remote Code Execution Vulnerability
CVE-2021-34474 No No Less Likely Less Likely Critical 8.0 7.0
GDI+ Information Disclosure Vulnerability
CVE-2021-34440 No No Less Likely Less Likely Important 5.5 4.8
HEVC Video Extensions Remote Code Execution Vulnerability
CVE-2021-31947 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-33775 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-33776 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-33777 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-33778 No No Less Likely Less Likely Important 7.8 6.8
Media Foundation Information Disclosure Vulnerability
CVE-2021-33760 No No Less Likely Less Likely Important 5.5 4.8
Microsoft Bing Search Spoofing Vulnerability
CVE-2021-33753 No No Less Likely Less Likely Important 4.7 4.1
Microsoft Defender Remote Code Execution Vulnerability
CVE-2021-34464 No No Less Likely Less Likely Critical 7.8 6.8
CVE-2021-34522 No No Less Likely Less Likely Critical 7.8 6.8
Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-34501 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34518 No No Less Likely Less Likely Important 7.8 6.8
Microsoft Exchange Information Disclosure Vulnerability
CVE-2021-33766 No No Less Likely Less Likely Important 7.3 6.4
Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2021-34523 Yes No Less Likely Less Likely Important 9.0 7.8
CVE-2021-33768 No No Less Likely Less Likely Important 8.0 7.0
CVE-2021-34470 No No Less Likely Less Likely Important 8.0 7.0
Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-31196 No No Less Likely Less Likely Important 7.2 6.3
CVE-2021-31206 No No Less Likely Less Likely Important 7.6 7.1
CVE-2021-34473 Yes No More Likely More Likely Critical 9.1 7.9
Microsoft Office Online Server Spoofing Vulnerability
CVE-2021-34451 No No Less Likely Less Likely Important 5.3 4.6
Microsoft Office Security Feature Bypass Vulnerability
CVE-2021-34469 No No Less Likely Less Likely Important 8.2 7.1
Microsoft SharePoint Server Information Disclosure Vulnerability
CVE-2021-34519 No No Less Likely Less Likely Moderate 5.3 4.8
Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-34467 No No More Likely More Likely Important 7.1 6.2
CVE-2021-34468 No No More Likely More Likely Important 7.1 6.2
CVE-2021-34520 No No More Likely More Likely Important 8.1 7.1
Microsoft SharePoint Server Spoofing Vulnerability
CVE-2021-34517 No No Less Likely Less Likely Important 5.3 4.6
Microsoft Visual Studio Spoofing Vulnerability
CVE-2021-34479 No No Less Likely Less Likely Important 7.8 6.8
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34441 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34439 No No Less Likely Less Likely Critical 7.8 6.8
CVE-2021-34503 No No Less Likely Less Likely Critical 7.8 6.8
Microsoft Word Remote Code Execution Vulnerability
CVE-2021-34452 No No Less Likely Less Likely Important 7.8 6.8
Open Enclave SDK Elevation of Privilege Vulnerability
CVE-2021-33767 No No Less Likely Less Likely Important 8.2 7.1
Power BI Remote Code Execution Vulnerability
CVE-2021-31984 No No Less Likely Less Likely Important 7.6 6.6
Raw Image Extension Remote Code Execution Vulnerability
CVE-2021-34521 No No Less Likely Less Likely Important 7.8 6.8
Scripting Engine Memory Corruption Vulnerability
CVE-2021-34448 No Yes Detected Detected Critical 6.8 6.3
Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-33751 No No Less Likely Less Likely Important 7.0 6.1
CVE-2021-34460 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34510 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34512 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34513 No No Less Likely Less Likely Important 7.8 6.8
Storage Spaces Controller Information Disclosure Vulnerability
CVE-2021-34509 No No Less Likely Less Likely Important 5.5 4.8
Visual Studio Code .NET Runtime Elevation of Privilege Vulnerability
CVE-2021-34477 No No Less Likely Less Likely Important 7.8 6.8
Visual Studio Code Remote Code Execution Vulnerability
CVE-2021-34528 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34529 No No Less Likely Less Likely Important 7.8 6.8
Win32k Elevation of Privilege Vulnerability
CVE-2021-34449 No No More Likely More Likely Important 7.0 6.1
CVE-2021-34516 No No Less Likely Less Likely Important 7.8 6.8
Win32k Information Disclosure Vulnerability
CVE-2021-34491 No No Less Likely Less Likely Important 5.5 4.8
Windows ADFS Security Feature Bypass Vulnerability
CVE-2021-33779 Yes No Less Likely Less Likely Important 8.1 7.1
Windows AF_UNIX Socket Provider Denial of Service Vulnerability
CVE-2021-33785 No No Less Likely Less Likely Important 7.5 6.5
Windows Address Book Remote Code Execution Vulnerability
CVE-2021-34504 No No Less Likely Less Likely Important 7.8 6.8
Windows AppContainer Elevation Of Privilege Vulnerability
CVE-2021-34459 No No Less Likely Less Likely Important 7.8 6.8
Windows AppX Deployment Extensions Elevation of Privilege Vulnerability
CVE-2021-34462 No No Less Likely Less Likely Important 7.0 6.1
Windows Authenticode Spoofing Vulnerability
CVE-2021-33782 No No Less Likely Less Likely Important 5.5 4.8
Windows Certificate Spoofing Vulnerability
CVE-2021-34492 Yes No Less Likely Less Likely Important 8.1 7.1
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2021-33784 No No Less Likely Less Likely Important 7.8 6.8
Windows Console Driver Elevation of Privilege Vulnerability
CVE-2021-34488 No No Less Likely Less Likely Important 7.8 6.8
Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2021-34461 No No Less Likely Less Likely Important 7.8 6.8
Windows DNS Server Denial of Service Vulnerability
CVE-2021-34442 No No Less Likely Less Likely Important 7.5 6.5
CVE-2021-34444 No No Less Likely Less Likely Important 6.5 5.7
CVE-2021-34499 No No Less Likely Less Likely Important 6.5 5.7
CVE-2021-33745 No No Less Likely Less Likely Important 6.5 5.7
Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-33780 No No More Likely More Likely Important 8.8 7.7
CVE-2021-34494 No No Less Likely Less Likely Critical 8.8 7.7
CVE-2021-33746 No No Less Likely Less Likely Important 8.0 7.0
CVE-2021-33754 No No Less Likely Less Likely Important 8.0 7.0
CVE-2021-34525 No No Less Likely Less Likely Important 8.8 7.7
Windows DNS Snap-in Remote Code Execution Vulnerability
CVE-2021-33749 No No Less Likely Less Likely Important 8.8 7.7
CVE-2021-33750 No No Less Likely Less Likely Important 8.8 7.7
CVE-2021-33752 No No Less Likely Less Likely Important 8.8 7.7
CVE-2021-33756 No No Less Likely Less Likely Important 8.8 7.7
Windows Desktop Bridge Elevation of Privilege Vulnerability
CVE-2021-33759 No No Less Likely Less Likely Important 7.8 6.8
Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-33774 No No Less Likely Less Likely Important 7.0 6.1
Windows File History Service Elevation of Privilege Vulnerability
CVE-2021-34455 No No Less Likely Less Likely Important 7.8 6.8
Windows Font Driver Host Remote Code Execution Vulnerability
CVE-2021-34438 No No Less Likely Less Likely Important 7.8 6.8
Windows GDI Elevation of Privilege Vulnerability
CVE-2021-34498 No No Less Likely Less Likely Important 7.8 6.8
Windows GDI Information Disclosure Vulnerability
CVE-2021-34496 No No Less Likely Less Likely Important 5.5 4.8
Windows HTML Platforms Security Feature Bypass Vulnerability
CVE-2021-34446 No No Less Likely Less Likely Important 8.0 7.0
Windows Hello Security Feature Bypass Vulnerability
CVE-2021-34466 No No Less Likely Less Likely Important 5.7 5.0
Windows Hyper-V Denial of Service Vulnerability
CVE-2021-33755 No No Less Likely Less Likely Important 6.3 5.5
CVE-2021-33758 No No Less Likely Less Likely Important 7.7 6.7
Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-34450 No No Less Likely Less Likely Critical 8.5 7.4
Windows InstallService Elevation of Privilege Vulnerability
CVE-2021-31961 No No Less Likely Less Likely Important 6.1 5.3
Windows Installer Elevation of Privilege Vulnerability
CVE-2021-34511 No No Less Likely Less Likely Important 7.8 6.8
Windows Installer Spoofing Vulnerability
CVE-2021-33765 No No Less Likely Less Likely Important 6.2 5.4
Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-33771 No Yes Detected Detected Important 7.8 7.2
CVE-2021-31979 No Yes Detected Detected Important 7.8 7.2
CVE-2021-34514 No No Less Likely Less Likely Important 7.8 6.8
Windows Kernel Memory Information Disclosure Vulnerability
CVE-2021-34500 No No Less Likely Less Likely Important 6.3 5.5
Windows Kernel Remote Code Execution Vulnerability
CVE-2021-34458 No No Less Likely Less Likely Critical 9.9 8.6
CVE-2021-34508 No No Less Likely Less Likely Important 8.8 7.7
Windows Key Distribution Center Information Disclosure Vulnerability
CVE-2021-33764 No No Less Likely Less Likely Important 5.9 5.2
Windows LSA Denial of Service Vulnerability
CVE-2021-33788 No No Less Likely Less Likely Important 7.5 6.5
Windows LSA Security Feature Bypass Vulnerability
CVE-2021-33786 No No Less Likely Less Likely Important 8.1 7.1
Windows MSHTML Platform Remote Code Execution Vulnerability
CVE-2021-34447 No No Less Likely Less Likely Important 6.8 5.9
CVE-2021-34497 No No Less Likely Less Likely Critical 6.8 5.9
Windows Media Remote Code Execution Vulnerability
CVE-2021-33740 No No Less Likely Less Likely Critical 7.8 6.8
Windows Partition Management Driver Elevation of Privilege Vulnerability
CVE-2021-34493 No No Less Likely Less Likely Important 6.7 5.8
Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-34527 Yes Yes Detected Detected Critical 8.8 8.2
Windows Projected File System Elevation of Privilege Vulnerability
CVE-2021-33743 No No Less Likely Less Likely Important 7.8 6.8
Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
CVE-2021-33761 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-33773 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34445 No No Less Likely Less Likely Important 7.8 6.8
CVE-2021-34456 No No Less Likely Less Likely Important 7.8 6.8
Windows Remote Access Connection Manager Information Disclosure Vulnerability
CVE-2021-33763 No No Less Likely Less Likely Important 5.5 4.8
CVE-2021-34454 No No Less Likely Less Likely Important 5.5 4.8
CVE-2021-34457 No No Less Likely Less Likely Important 5.5 4.8
Windows Remote Assistance Information Disclosure Vulnerability
CVE-2021-34507 No No Less Likely Less Likely Important 6.5 5.7
Windows SMB Information Disclosure Vulnerability
CVE-2021-33783 No No Less Likely Less Likely Important 6.5 5.7
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
CVE-2021-33744 No No Less Likely Less Likely Important 5.3 4.6
Windows Security Account Manager Remote Protocol Security Feature Bypass Vulnerability
CVE-2021-33757 No No Less Likely Less Likely Important 5.3 4.6
Windows TCP/IP Driver Denial of Service Vulnerability
CVE-2021-31183 No No Less Likely Less Likely Important 7.5 6.5
CVE-2021-33772 No No Less Likely Less Likely Important 7.5 6.5
CVE-2021-34490 No No Less Likely Less Likely Important 7.5 6.5

 

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Renato Marinho
Morphus Labs| LinkedIn|Twitter

Renato

67 Posts
ISC Handler
Jul 13th 2021

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