Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

Microsoft Windows Installer contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Print Spooler contains an unspecified vulnerability that allows for remote code execution.

Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents. An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Microsoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: “Suspicious Cpl File Execution”. Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs. Please see the Mitigations and Workaround sections for important information about steps you can take to protect your system from this vulnerability. UPDATE September 14, 2021: Microsoft has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. Please see the FAQ for important information about which updates are applicable to your system.

Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Update Medic Service contains an unspecified vulnerability that allows for privilege escalation.

An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.

Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Event Tracing contains an unspecified vulnerability which can allow for privilege escalation.

Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption.

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Cryptographic Next Generation (CNG) Key Isolation Service contains an unspecified vulnerability that allows an attacker to gain SYSTEM-level privileges.

Microsoft Windows contains an unspecified vulnerability in the JScript9 scripting language which allows for remote code execution.

Microsoft Windows Mark of the Web (MOTW) contains a security feature bypass vulnerability resulting in a limited loss of integrity and availability of security features.

Microsoft Windows Print Spooler contains an unspecified vulnerability that allows an attacker to gain SYSTEM-level privileges.

Microsoft Windows Mark of the Web (MOTW) contains a security feature bypass vulnerability resulting in a limited loss of integrity and availability of security features.

A remote code execution vulnerability exists when MSDT is called using the URL protocol from a calling application such as Word. An attacker who successfully exploits this vulnerability can run arbitrary code with the privileges of the calling application. The attacker can then install programs, view, change, or delete data, or create new accounts in the context allowed by the user’s rights. Please see the MSRC Blog Entry for important information about steps you can take to protect your system from this vulnerability.

Microsoft Windows AppX Installer contains a spoofing vulnerability which has a high impacts to confidentiality, integrity, and availability.

Microsoft Windows Mark of the Web (MOTW) contains a security feature bypass vulnerability resulting in a limited loss of integrity and availability of security features.

Microsoft Defender SmartScreen contains a security feature bypass vulnerability that could allow an attacker to evade Mark of the Web (MOTW) defenses via a specially crafted malicious file.

Microsoft Windows COM+ Event System Service contains an unspecified vulnerability that allows for privilege escalation.

Microsoft Windows Print Spooler service contains a privilege escalation vulnerability. An attacker may modify a JavaScript constraints file and execute it with SYSTEM-level permissions.

Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.

A remote code execution vulnerability exists when Microsoft Windows MSDT is called using the URL protocol from a calling application.

Microsoft Windows Local Security Authority (LSA) contains a spoofing vulnerability where an attacker can coerce the domain controller to authenticate to the attacker using NTLM.

An authenticated user could manipulate attributes on computer accounts they own or manage, and acquire a certificate from Active Directory Certificate Services that would allow for privilege escalation to SYSTEM.

Microsoft Windows User Profile Service contains an unspecified vulnerability that allows for privilege escalation.

Windows Common Log File System Driver Elevation of Privilege Vulnerability