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OpenAdvisories
High MSRC-CVE-2022-38023 1 CVE

Netlogon RPC Elevation of Privilege Vulnerability

Published Nov 8, 2022 · Updated Jul 18, 2023 · Revision 5

Vendor: Microsoft

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation More Likely. Customer action: Required.

Details

Does this vulnerability affect client operating systems?
This vulnerability only applies the Windows Server versions listed in the Security Update table.

Where can I find more information about these changes?
For more information please see How to manage Netlogon Protocol changes related to CVE-2022-38023.

I am running Windows Server 2022 Datacenter: Azure Edition (Server Core) but the hotpatch (Windows Server 2022 Datacenter: Azure Edition (Hotpatch)) for it is not listed in the Security Updates table. Is there an update that I can apply for this edition of Windows Server 2022?
The update to address this vulnerability for Windows Server 2022 Datacenter: Azure Edition (Server Core) is not hotpatchable and is therefore not included in the November Hotpatch KB (5019080). Customers running Windows Server 2022 Datacenter: Azure Edition (Server Core) as a domain controller should install the update for Windows Server 2022 (5019081). This update will require a computer restart.

What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited this vulnerability could gain administrator privileges.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to gather information specific to the environment of the targeted component.

How could an attacker exploit this vulnerability?
An authenticated attacker could leverage cryptographic protocol vulnerabilities in the Windows Netlogon protocol when RPC Signing is used instead of RPC Sealing. Where RPC Signing is used instead of RPC Sealing the attacker could gain control of the service and then might be able to modify Netlogon protocol traffic to elevate their privileges.

How does Microsoft plan to address this vulnerability?
To give administrators time to make corrections that prevent authentication failures, and to provide a choice on when to implement the enforcement, Microsoft is addressing this vulnerability in a phased rollout.
Please refer to the planned enforcement timeline in the KB article: How to manage Netlogon Protocol changes related to CVE-2022-38023.
When each phase of Windows updates become available, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this CVE. See Microsoft Technical Security Notifications and Security Update Guide Notification System News: Create your profile now – Microsoft Security Response Center.

Security updates
10.0.17763.4645 — https://support.microsoft.com/help/5028168
10.0.20348.1850 — https://support.microsoft.com/help/5028171
10.0.14393.6085 — https://support.microsoft.com/help/5028169
6.0.6003.22175 — https://support.microsoft.com/help/5028222
6.0.6003.22175 — https://support.microsoft.com/help/5028226
6.1.7601.26623 — https://support.microsoft.com/help/5028240
6.1.7601.26623 — https://support.microsoft.com/help/5028224
6.2.9200.24374 — https://support.microsoft.com/help/5028232
6.2.9200.24374 — https://support.microsoft.com/help/5028233
6.3.9600.21063 — https://support.microsoft.com/help/5028228
6.3.9600.21075 — https://support.microsoft.com/help/5028223

Vulnerabilities 1

Revision history

  1. #5

    Removed the Security Hotpatch Update for the July 2023 revision as that package doesn't exist for this release cycle. You must install the Security Update to get the updated software.

  2. #4

    Microsoft is announcing the release of the fourth phase of Windows security updates to address this vulnerability. The July 2023 updates remove the ability to set value 1 to the RequireSeal registry subkey and enables the Enforcement phase. Please see [How to manage Netlogon Protocol changes related to CVE-2022-38023](https://support.microsoft.com/help/5021130) for more information, including the planned enforcement timeline.

  3. #3

    Updated FAQ information. This is an informational change only.

  4. #2

    Microsoft is announcing the release of the second phase of Windows security updates to address this vulnerability. The April 2023 updates remove the ability to disable RPC sealing by setting value 0 to the RequireSeal registry subkey. Please see [How to manage Netlogon Protocol changes related to CVE-2022-38023](https://support.microsoft.com/help/5021130) for more information, including the planned enforcement timeline.

  5. #1

    Information published.

References