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.NET Denial of Service Vulnerability

High severity GitHub Reviewed Published Feb 8, 2022 in dotnet/aspnetcore • Updated Jun 30, 2023

Package

nuget Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet)

Affected versions

>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2

Patched versions

5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet)
>= 6.0.0, < 6.0.2
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-arm (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2
nuget Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet)
>= 5.0.0, < 5.0.14
>= 6.0.0, < 6.0.2
5.0.14
6.0.2

Description

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0 and .NET 5.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A Denial of Service vulnerability exists in .NET 6.0 and .NET 5.0 when the Kestrel web server processes certain HTTP/2 and HTTP/3 requests.

Affected Software

  • Any .NET 6.0 application running on .NET 6.0.1 or lower.
  • Any .NET 5.0 application running on .NET 5.0.13 or lower.

Patches

To fix the issue, please install the latest version of .NET 6.0 or .NET 5.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.

.NET 6.0 and .NET 5.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates.

Other Details

References

@rbhanda rbhanda published to dotnet/aspnetcore Feb 8, 2022
Published by the National Vulnerability Database Feb 9, 2022
Published to the GitHub Advisory Database Oct 21, 2022
Reviewed Oct 21, 2022
Last updated Jun 30, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.196%
(58th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2022-21986

GHSA ID

GHSA-x459-p2rx-f8ff

Source code

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