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CVE-2022-21907 - Security Update Guide - Microsoft - HTTP Protocol Stack Remote...

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source link: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21907
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HTTP Protocol Stack Remote Code Execution Vulnerability

CVE-2022-21907
Security Vulnerability

Released: Jan 11, 2022 Last updated: Jan 12, 2022

Assigning CNA:
Microsoft

MITRE CVE-2022-21907

CVSS:3.1 9.8 / 8.5
Metric
Value
Base score metrics(8)
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Temporal score metrics(3)
Exploit Code Maturity
Unproven
Remediation Level
Official Fix
Report Confidence
Confirmed

Please see Common Vulnerability Scoring System for more information on the definition of these metrics.

Exploitability

The following table provides an exploitability assessment for this vulnerability at the time of original publication.
Publicly Disclosed
Exploited
Exploitability Assessment
Exploitation More Likely

Mitigations

Windows Server 2019 and Windows 10 version 1809 are not vulnerable by default. Unless you have enabled the HTTP Trailer Support via EnableTrailerSupport registry value, the systems are not vulnerable.

Delete the DWORD registry value "EnableTrailerSupport" if present under:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters

This mitigation only applies to Windows Server 2019 and Windows 10, version 1809 and does not apply to Windows 10, version 20H2 and newer.

How could an attacker exploit this vulnerability?

In most situations, an unauthenticated attacker could send a specially crafted packet to a targeted server utilizing the HTTP Protocol Stack (http.sys) to process packets.

Is this wormable?

Yes. Microsoft recommends prioritizing the patching of affected servers.

Windows 10, Version 1909 is not in the Security Updates table. Is it affected by this vulnerability?

No, the vulnerable code does not exist in Windows 10, version 1909. It is not affected by this vulnerability.

Is the EnableTrailerSupport registry key present in any other platform than Windows Server 2019 and Windows 10, version 1809?

No, the registry key is only present in Windows Server 2019 and Windows 10, version 1809.

Acknowledgements

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information.

Security Updates

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

Version
Revision Date
Description
Jan 12, 2022

Clarified the mitigation and added FAQs. These are informational changes only.

Jan 11, 2022

Information published.


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