Patch Tuesday, July 2021
We're a little over halfway through the year now as July's Patch Tuesday is released and it's been a rough year so far for Microsoft. From the HAFNIUM zero-day campaign targeting Exchange back in March to the accidental zero-day release last month for PrintNightmare. Unlike the relatively light releases over the past couple of months, July's release includes patches for 117 CVEs, including 13 rated as "Critical" and 102 rated "Important" and one each rated as "Moderate" and "Low".
The formal patch for PrintNightmare (CVE-2021-34527) is included in the Critical list as is a Remote Code Vulnerability in the MS Scripting Engine which has been seen exploited in specific targeted attacks. Also on that list are two Remote Code Vulnerabilities in Microsoft Defender as well as in Windows DNS Server and in Windows Hyper-V platform.
The long list of CVEs rated as "Important" includes an additional dozen CVEs patched for Windows DNS Server half of which are RCE (the other half being Denial of Service). There are also RCE vulnerabilities patched in Microsoft Sharepoint, Microsoft Exchange Server, Visual Studio, and even the Windows Address book.
Several of these vulnerabilities are already being exploited in the wild so it's imperative that you patch your systems as soon as you can. Stay safe!
Critical
Dynamics Business Central Remote Code Execution Vulnerability
CVE-2021-34474
Remote Code Execution
Microsoft Defender Remote Code Execution Vulnerability
CVE-2021-34464, CVE-2021-34522
Remote Code Execution
Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-34473
Remote Code Execution
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34439, CVE-2021-34503
Remote Code Execution
Scripting Engine Memory Corruption Vulnerability
CVE-2021-34448
Remote Code Execution
Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-34494
Remote Code Execution
Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-34450
Remote Code Execution
Windows Kernel Remote Code Execution Vulnerability
CVE-2021-34458
Remote Code Execution
Windows Media Remote Code Execution Vulnerability
CVE-2021-33740
Remote Code Execution
Windows MSHTML Platform Remote Code Execution Vulnerability
CVE-2021-34497
Remote Code Execution
Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-34527
Remote Code Execution
Important
Active Directory Security Feature Bypass Vulnerability
CVE-2021-33779, CVE-2021-33781
Security Feature Bypass
Bowser.sys Denial of Service Vulnerability
CVE-2021-34476
Denial of Service
DirectWrite Remote Code Execution Vulnerability
CVE-2021-34489
Remote Code Execution
GDI+ Information Disclosure Vulnerability
CVE-2021-34440
Information Disclosure
HEVC Video Extensions Remote Code Execution Vulnerability
CVE-2021-31947, CVE-2021-33775, CVE-2021-33776, CVE-2021-33777, CVE-2021-33778
Remote Code Execution
Media Foundation Information Disclosure Vulnerability
CVE-2021-33760
Information Disclosure
Microsoft Bing Search Spoofing Vulnerability
CVE-2021-33753
Spoofing
Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-34501, CVE-2021-34518
Remote Code Execution
Microsoft Exchange Information Disclosure Vulnerability
CVE-2021-33766
Information Disclosure
Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2021-33768, CVE-2021-34470, CVE-2021-34523
Elevation of Privilege
Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-31196, CVE-2021-31206
Remote Code Execution
Microsoft Office Online Server Spoofing Vulnerability
CVE-2021-34451
Spoofing
Microsoft Office Security Feature Bypass Vulnerability
CVE-2021-34469
Security Feature Bypass
Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-34467, CVE-2021-34468, CVE-2021-34520
Remote Code Execution
Microsoft SharePoint Server Spoofing Vulnerability
CVE-2021-34517
Spoofing
Microsoft Visual Studio Spoofing Vulnerability
CVE-2021-34479
Spoofing
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34441
Remote Code Execution
Microsoft Word Remote Code Execution Vulnerability
CVE-2021-34452
Remote Code Execution
Open Enclave SDK Elevation of Privilege Vulnerability
CVE-2021-33767
Elevation of Privilege
Power BI Remote Code Execution Vulnerability
CVE-2021-31984
Remote Code Execution
Raw Image Extension Remote Code Execution Vulnerability
CVE-2021-34521
Remote Code Execution
Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-33751, CVE-2021-34460, CVE-2021-34510, CVE-2021-34512, CVE-2021-34513
Elevation of Privilege
Storage Spaces Controller Information Disclosure Vulnerability
CVE-2021-34509
Information Disclosure
Visual Studio Code .NET Runtime Elevation of Privilege Vulnerability
CVE-2021-34477
Elevation of Privilege
Visual Studio Code Remote Code Execution Vulnerability
CVE-2021-34528, CVE-2021-34529
Remote Code Execution
Win32k Elevation of Privilege Vulnerability
CVE-2021-34449, CVE-2021-34516
Elevation of Privilege
Win32k Information Disclosure Vulnerability
CVE-2021-34491
Information Disclosure
Windows Address Book Remote Code Execution Vulnerability
CVE-2021-34504
Remote Code Execution
Windows AF_UNIX Socket Provider Denial of Service Vulnerability
CVE-2021-33785
Denial of Service
Windows AppContainer Elevation Of Privilege Vulnerability
CVE-2021-34459
Elevation of Privilege
Windows AppX Deployment Extensions Elevation of Privilege Vulnerability
CVE-2021-34462
Elevation of Privilege
Windows Authenticode Spoofing Vulnerability
CVE-2021-33782
Spoofing
Windows Certificate Spoofing Vulnerability
CVE-2021-34492
Spoofing
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2021-33784
Elevation of Privilege
Windows Console Driver Elevation of Privilege Vulnerability
CVE-2021-34488
Elevation of Privilege
Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2021-34461
Elevation of Privilege
Windows Desktop Bridge Elevation of Privilege Vulnerability
CVE-2021-33759
Elevation of Privilege
Windows DNS Server Denial of Service Vulnerability
CVE-2021-33745, CVE-2021-33746, CVE-2021-33754, CVE-2021-34442, CVE-2021-34444, CVE-2021-34499
Denial of Service
Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-33780, CVE-2021-34525
Remote Code Execution
Windows DNS Snap-in Remote Code Execution Vulnerability
CVE-2021-33749, CVE-2021-33750, CVE-2021-33752, CVE-2021-33756
Remote Code Execution
Windows Event Tracing Elevation of Privilege Vulnerability
CVE-2021-33774
Elevation of Privilege
Windows File History Service Elevation of Privilege Vulnerability
CVE-2021-34455
Elevation of Privilege
Windows Font Driver Host Remote Code Execution Vulnerability
CVE-2021-34438
Remote Code Execution
Windows GDI Elevation of Privilege Vulnerability
CVE-2021-34498
Elevation of Privilege
Windows GDI Information Disclosure Vulnerability
CVE-2021-34496
Information Disclosure
Windows Hello Security Feature Bypass Vulnerability
CVE-2021-34466
Security Feature Bypass
Windows HTML Platform Security Feature Bypass Vulnerability
CVE-2021-34446
Security Feature Bypass
Windows Hyper-V Denial of Service Vulnerability
CVE-2021-33755, CVE-2021-33758
Denial of Service
Windows Hyper-V Information Disclosure Vulnerability
CVE-2021-34500
Information Disclosure
Windows Installer Elevation of Privilege Vulnerability
CVE-2021-34511
Elevation of Privilege
Windows Installer Spoofing Vulnerability
CVE-2021-33765
Spoofing
Windows InstallService Elevation of Privilege Vulnerability
CVE-2021-31961
Elevation of Privilege
Windows Kernel Elevation of Privilege Vulnerability
CVE-2021-31979, CVE-2021-33771, CVE-2021-34514
Elevation of Privilege
Windows Kernel Remote Code Execution Vulnerability
CVE-2021-34508
Remote Code Execution
Windows Key Distribution Center Information Disclosure Vulnerability
CVE-2021-33764
Information Disclosure
Windows LSA Denial of Service Vulnerability
CVE-2021-33788
Denial of Service
Windows LSA Security Feature Bypass Vulnerability
CVE-2021-33786
Security Feature Bypass
Windows MSHTML Platform Remote Code Execution Vulnerability
CVE-2021-34447
Remote Code Execution
Windows Partition Management Driver Elevation of Privilege Vulnerability
CVE-2021-34493
Elevation of Privilege
Windows Projected File System Elevation of Privilege Vulnerability
CVE-2021-33743
Elevation of Privilege
Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
CVE-2021-33761, CVE-2021-33773, CVE-2021-34445, CVE-2021-34456
Elevation of Privilege
Windows Remote Access Connection Manager Information Disclosure Vulnerability
CVE-2021-33763, CVE-2021-34454, CVE-2021-34457
Information Disclosure
Windows Secure Kernel Mode Security Feature Bypass Vulnerability
CVE-2021-33744
Security Feature Bypass
Windows Security Account Manager Remote Protocol Security Feature Bypass Vulnerability
CVE-2021-33757
Security Feature Bypass
Windows SMB Information Disclosure Vulnerability
CVE-2021-33783
Information Disclosure
Windows TCP/IP Driver Denial of Service Vulnerability
CVE-2021-31183, CVE-2021-33772, CVE-2021-34490
Denial of Service
Moderate
Microsoft SharePoint Server Information Disclosure Vulnerability
CVE-2021-34519
Information Disclosure
Low
Windows Remote Assistance Information Disclosure Vulnerability
CVE-2021-34507
Information Disclosure
About the Author
Karl Sigler is Security Research Manager, SpiderLabs Threat Intelligence at Trustwave. Karl is a 20-year infosec veteran responsible for research and analysis of current vulnerabilities, malware and threat trends at Trustwave. Follow Karl on LinkedIn.
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