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Does CVE-2022-38023 have any impact to ONTAP 9?

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Applies to

  • ONTAP 9
  • FSX
  • Cloud Volumes ONTAP (CVO)
  • SMB/CIFS
  • Netlogon (NTLM Authentication)
  • CVE-2022-38023 - Netlogon RPC Elevation of Privilege Vulnerability

Answer

  1. ONTAP features configured for domain authentication using NTLMv1 or NTLMv2 e.g. CIFS, Vscan, RBAC, domain tunnel, etc. are affected:
::> set advanced
::*> vserver cifs session show -vserver <vserver> -fields auth-mechanism,address,windows-user
node         vserver   session-id           connection-id address      auth-mechanism windows-user
------------ --------- -------------------- ------------- ------------ -------------- ------------
netapp-01a   <vserver> 17134789207261194186 2550496605    10.62.125.88 NTLMv2         DEMO\user6
netapp-01b   <vserver> 17134789207261194188 2550496606    10.216.29.42 Kerberos       DEMO\Administrator
2 entries were displayed.

Note: If Kerberos authentication attempt fails, NTLM (NTLMv1 or NTLMv2) is default fallback.

  1. Impact: All CIFS Domain authentication using NTLM will fail post DC server patch upgrade:  CONTAP-80033: NTLM authentication fails due to enforcement of Netlogon RPC sealing
  2. Actions as per SU530 are required before June 13, 2023 - "Enforcement by Default" phase when Microsoft's CVE-2022-38023 patches are installed
How do the phases impact ONTAP?

Microsoft Phases

What changed

How did this impact ONTAP 9?

What options do I have?

July 2023 - Enforcement Phase

The Windows updates released on July 11, 2023 will remove the ability to set RequireSeal:1

RequireSeal is forced to be to 2, contents of the registry value are ignored.

ONTAP impact once RequireSeal:1 is set:
ONTAP impact once RequireSeal:2 is set:
FAILURE: Pass-through authentication failed. (NT Status: NT_STATUS_NO_LOGON_SERVERS(0xc000005e))
  • EMS also indicate below event to indicate no DC's available.

secd.netlogon.noServers: None of the Netlogon servers configured for Vserver (vs1) are currently accessible via the network.

  • Domain Controller may record following event ID 5838 as Error. 
Log Name:      System
Source:        NETLOGON
Date:          2/22/2023 3:17:28 PM
Event ID:      5838
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      dc1.demo.netapp.local
Description:
The Netlogon service encountered a client using RPC signing instead of RPC sealing.  

Machine SamAccountName: CIFSSERVERNAME 

 

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