CVE-2022-32230

Public Exploit
SMBv3 FileNormalizedNameInformation NULL Pointer Dereference

Description

Microsoft Windows SMBv3 suffers from a null pointer dereference in versions of Windows prior to the April, 2022 patch set. By sending a malformed FileNormalizedNameInformation SMBv3 request over a named pipe, an attacker can cause a Blue Screen of Death (BSOD) crash of the Windows kernel. For most systems, this attack requires authentication, except in the special case of Windows Domain Controllers, where unauthenticated users can always open named pipes as long as they can establish an SMB session. Typically, after the BSOD, the victim SMBv3 server will reboot.

Remediation

Solution:

  • This was fixed as a stability issue in the April, 2022 Patch Tuesday set from Microsoft.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.55% Top 20%
Vendor Advisory microsoft.com Vendor Advisory microsoft.com
Affected: Microsoft Windows 10 Version 20H2
Affected: Microsoft Windows Server Version 20H2
Affected: Microsoft Windows 10 Version 21H1
Affected: Microsoft Windows 10 Version 21H2
Published at:
Updated at:

References

Link Tags
https://www.rapid7.com/blog/post/2022/06/14/cve-2022-32230-windows-smb-denial-of-service-vulnerability-fixed/ third party advisory exploit
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-32230 patch vendor advisory
https://github.com/zeroSteiner/metasploit-framework/blob/feat/mod/cve-2022-32230/modules/auxiliary/dos/smb/smb_filenormalizednameinformation.rb third party advisory exploit
https://support.microsoft.com/en-us/topic/may-10-2022-kb5013942-os-builds-19042-1706-19043-1706-and-19044-1706-60b51119-85be-4a34-9e21-8954f6749504 patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2022-32230?
CVE-2022-32230 has been scored as a high severity vulnerability.
How to fix CVE-2022-32230?
To fix CVE-2022-32230: This was fixed as a stability issue in the April, 2022 Patch Tuesday set from Microsoft.
Is CVE-2022-32230 being actively exploited in the wild?
It is possible that CVE-2022-32230 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-32230?
CVE-2022-32230 affects Microsoft Windows 10 Version 20H2, Microsoft Windows Server Version 20H2, Microsoft Windows 10 Version 21H1, Microsoft Windows 10 Version 21H2.
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