Microsoft November 2022 Patch Tuesday fixes 6 exploited zero-days, 68 flaws

Today is Microsoft’s November 2022 Patch Tuesday, and with it comes fixes for six actively exploited Windows vulnerabilities and a total of 68 flaws.

Eleven of the 68 vulnerabilities fixed in today’s update are classified as ‘Critical’ as they allow privilege elevation, spoofing, or remote code execution, one of the most severe types of vulnerabilities.

The number of bugs in each vulnerability category is listed below:

  • 27 Elevation of Privilege Vulnerabilities
  • 4 Security Feature Bypass Vulnerabilities
  • 16 Remote Code Execution Vulnerabilities
  • 11 Information Disclosure Vulnerabilities
  • 6 Denial of Service Vulnerabilities
  • 3 Spoofing Vulnerabilities

Six actively exploited zero-days fixed

This month’s Patch Tuesday fixes six actively exploited zero-day vulnerabilities, with one being publicly disclosed.

Microsoft classifies a vulnerability as a zero-day if it is publicly disclosed or actively exploited with no official fix available.

The six actively exploited zero-day vulnerabilities fixed in today’s updates are:

CVE-2022-41128 – Windows Scripting Languages Remote Code Execution Vulnerability discovered by Clément Lecigne of Google’s Threat Analysis Group

“This vulnerability requires that a user with an affected version of Windows access a malicious server. An attacker would have to host a specially crafted server share or website. An attacker would have no way to force users to visit this specially crafted server share or website, but would have to convince them to visit the server share or website, typically by way of an enticement in an email or chat message.”

CVE-2022-41091 – Windows Mark of the Web Security Feature Bypass Vulnerability discovered by Will Dormann.

“An attacker can craft a malicious file that would evade Mark of the Web (MOTW) defenses, resulting in a limited loss of integrity and availability of security features such as Protected View in Microsoft Office, which rely on MOTW tagging.”

This security updates fixes two Mark of the Web bypasses discovered by Dormann, who demonstrated how a specially crafted Zip file can be created to bypass the Windows security feature.

Today, Dormann provided more details on how to create the Zip file and exploit this vulnerability, which is simply to create a ZIP archive containing a read-only file.

CVE-2022-41073 – Windows Print Spooler Elevation of Privilege Vulnerability discovered by Microsoft Threat Intelligence Center (MSTIC).

“An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.”

CVE-2022-41125 – Windows CNG Key Isolation Service Elevation of Privilege Vulnerability discovered by Microsoft Threat Intelligence Center (MSTIC) and Microsoft Security Response Center (MSRC).

“An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.”

CVE-2022-41040 – Microsoft Exchange Server Elevation of Privilege Vulnerability discovered by GTSC and disclosed through Zero Dat initiative.

“The privileges acquired by the attacker would be the ability to run PowerShell in the context of the system.”

CVE-2022-41082 – Microsoft Exchange Server Remote Code Execution Vulnerability discovered by GTSC and disclosed through Zero Dat initiative.

“The attacker for this vulnerability could target the server accounts in an arbitrary or remote code execution. As an authenticated user, the attacker could attempt to trigger malicious code in the context of the server’s account through a network call.”

More information about the above Microsoft Exchange vulnerabilities can be found in the next section.

Microsoft Exchange ProxyNotShell zero-days fixed

Today, Microsoft has fixed the ProxyNotShell vulnerabilities in the KB5019758 security update for Microsoft Exchange Server 2019, 2016, and 2013.

Recent updates from other companies

Other vendors who released updates in November 2022 include:

The November 2022 Patch Tuesday Security Updates

Below is the complete list of resolved vulnerabilities and released advisories in the November 2022 Patch Tuesday updates. To access the full description of each vulnerability and the systems that it affects, you can view the full report here.

 

Original Posts: Microsoft November 2022 Patch Tuesday fixes 6 exploited zero-days, 68 flaws