Microsoft Patch Tuesday – May 2023

Patch Tuesday is once again upon us. As always, our team has put together the monthly Patch Tuesday Report to help you manage your update progress. The audit report gives you a quick and clear overview of your Windows machines and their patching status. The May 2023 edition of Patch Tuesday brings us 38 new fixes, with 6 rated as critical, and 13 previously fixed vulnerabilities were updated. We’ve listed the most important changes below.

⚡ TL;DR | Go Straight to the May 2023 Patch Tuesday Audit Report

Microsoft SharePoint Server Remote Code Execution Vulnerability

One most critical vulnerabilities this month is in Microsoft SharePoint. CVE-2023-24955 only has a CVSS base score of 7.2 but the fact that this is a vulnerability in a popular Microsoft product and the fact that Microsoft lists that exploitation is «more likely» brings this to the top of the list.

To exploit this vulnerability an authenticated attacker as a Site Owner could execute code remotely on the SharePoint Server.

Windows Network File System Remote Code Execution Vulnerability

The second critical vulnerability is one which has seen multiple vulnerabilities in the past. The Network File System (NFS) contains the RCE vulnerability CVE-2023-24941. With a CVSS base score of 9.8 its obvious why this is one of the to-watch vulnerabilities.

Attackers can exploit this vulnerability by making an unauthenticated, specially crafted call to a Network File System service to trigger a Remote Code Execution. If you have NFS servers and you can’t wait for the update, Microsoft does have mitigation steps in the advisory.

If you want a quick overview of your NFS servers, you can run our Windows Server NFS Role Audit.

Windows OLE Remote Code Execution Vulnerability

The last vulnerability I will cover is a vulnerability in the Windows Object Linking & Embedding component. CVE-2023-29325 has a CVSS base score of 8.1. Microsoft has quite some information on this vulnerability and does also list that exploitation is likely.

The vulnerability can be exploited through the Window’s preview panes. They also provide an example of exploitation:

In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted email to the victim. Exploitation of the vulnerability might involve either a victim opening a specially crafted email with an affected version of Microsoft Outlook software, or a victim’s Outlook application displaying a preview of a specially crafted email . This could result in the attacker executing remote code on the victim’s machine.

Run the Patch Tuesday May 2023 Audit

To help manage your update progress, we’ve created the Patch Tuesday Audit that checks if the assets in your network are on the latest patch updates. The report has been color-coded to see which machines are up-to-date and which ones still need to be updated. As always, system administrators are urged to update their environment as soon as possible to ensure all endpoints are secured.

The Lansweeper Patch Tuesday report is automatically added to Lansweeper Cloud sites. Lansweeper Cloud is included in all our licenses without any additional cost and allows you to federate all your installations into one single view so all you need to do is look at one report, automatically added every patch Tuesday!

Patch Tuesday May 2023 CVE Codes & Titles

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