=====================================================================

                                CERT-Renater

                     Note d'Information No. 2023/VULN157

_____________________________________________________________________

DATE                : 14/04/2023

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Any .NET 7.0 application running
                             on .NET 7.0.4 or earlier,
           Any .NET 6.0 application running on .NET 6.0.15 or earlier.

=====================================================================
https://github.com/advisories/GHSA-w4m3-43gp-x8hx
_____________________________________________________________________


.NET Remote Code Execution Vulnerability
High severity GitHub Reviewed Published Apr 11, 2023 in dotnet/runtime
  Updated Apr 11, 2023

Vulnerability details

Package
Microsoft.NetCore.App.Runtime.win-arm (NuGet)

Affected versions
>= 7.0.0, <= 7.0.4
>= 6.0.0, <= 6.0.15

Patched versions
7.0.5
6.0.16

Microsoft.NetCore.App.Runtime.win-arm64 (NuGet)
>= 7.0.0, <= 7.0.4
>= 6.0.0, <= 6.0.15
7.0.5
6.0.16

Microsoft.NetCore.App.Runtime.win-x64 (NuGet)
>= 6.0.0, <= 6.0.15
>= 7.0.0, <= 7.0.4
6.0.16
7.0.5

Microsoft.NetCore.App.Runtime.win-x86 (NuGet)
>= 7.0.0, <= 7.0.4
>= 6.0.0, <= 6.0.15
7.0.5
6.0.16


Description

Microsoft Security Advisory CVE-2023-28260: .NET Remote Code Execution 
Vulnerability


Executive summary

Microsoft is releasing this security advisory to provide
information about a vulnerability in .NET 7.0 and .NET 6.0.
This advisory also provides guidance on what developers
can do to update their applications to remove this
vulnerability.

A vulnerability exists in .NET running on Windows where a
runtime DLL can be loaded from an unexpected location,
resulting in remote code execution.


Announcement

Announcement for this issue can be found at
dotnet/announcements#250


Mitigation factors

Microsoft has not identified any mitigating factors for this
vulnerability.


Affected software

     Any .NET 7.0 application running on .NET 7.0.4 or earlier.
     Any .NET 6.0 application running on .NET 6.0.15 or earlier.


Advisory FAQ
How do I know if I am affected?

If you have a runtime or SDK with a version listed, or an
affected package listed in affected software, you're exposed
to the vulnerability.


How do I fix the issue?

     To fix the issue please install the latest version of
.NET 6.0 or .NET 7.0. 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.


     If you have .NET 6.0 or greater installed, you can list
the versions you have installed by running the dotnet --info
command. You will see output like the following;

     If you are using one of the affected packages, please
update to the patched version listed above.

.NET Core SDK (reflecting any global.json):

  Version:   6.0.300
  Commit:    8473146e7d

Runtime Environment:

  OS Name:     Windows
  OS Version:  10.0.18363
  OS Platform: Windows
  RID:         win10-x64
  Base Path:   C:\Program Files\dotnet\sdk\6.0.300\

Host (useful for support):

   Version: 6.0.5
   Commit:  8473146e7d

.NET Core SDKs installed:

   6.0.300 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:

   Microsoft.AspNetCore.App 6.0.5 [C:\Program 
Files\dotnet\shared\Microsoft.AspNetCore.App]
   Microsoft.NETCore.App 6.0.5 [C:\Program 
Files\dotnet\shared\Microsoft.NETCore.App]
   Microsoft.WindowsDesktop.App 6.0.5 [C:\Program 
Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET Core runtimes or SDKs:
   https://aka.ms/dotnet-download

     If you're using .NET 7.0, you should download and install
Runtime 7.0.5 or SDK 7.0.203 (for Visual Studio 2022 v17.5)
from https://dotnet.microsoft.com/download/dotnet-core/7.0.

     If you're using .NET 6.0, you should download and install
Runtime 6.0.16 or SDK 6.0.311 (for Visual Studio 2022 v17.2)
from https://dotnet.microsoft.com/download/dotnet-core/6.0.

.NET 6.0 and and .NET 7.0 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.

Once you have installed the updated runtime or SDK,
restart your apps for the update to take effect.

Additionally, if you've deployed self-contained
applications including Native AOT targeting any of the
impacted versions, these applications are also vulnerable
and must be recompiled and redeployed.


Other Information

Reporting Security Issues

If you have found a potential security issue in .NET 6.0
or .NET 7.0, please email details to secure@microsoft.com.
Reports may qualify for the Microsoft .NET Core & .NET 5
Bounty. Details of the Microsoft .NET Bounty Program
including terms and conditions are at
https://aka.ms/corebounty.


Support

You can ask questions about this issue on GitHub in the
.NET GitHub organization. The main repos are located at
https://github.com/dotnet/runtime and
https://github.com/dotnet/aspnet/. The Announcements repo
(https://github.com/dotnet/Announcements) will contain
this bulletin as an issue and will include a link to a
discussion issue. You can ask questions in the linked
discussion issue.


Disclaimer

The information provided in this advisory 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.


Acknowledgements

ycdxsb with VARAS@IIE
External Links

CVE-2023-28260
Revisions

V1.0 (April 11, 2023): Advisory published.

Version 1.0

Last Updated 2023-04-11


References

     GHSA-w4m3-43gp-x8hx
     https://nvd.nist.gov/vuln/detail/CVE-2023-28260
     https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28260
     https://www.cve.org/CVERecord?id=CVE-2023-28260

@rbhanda rbhanda published to dotnet/runtime Apr 11, 2023
Published by the National Vulnerability Database Apr 11, 2023
Published to the GitHub Advisory Database Apr 11, 2023
Reviewed Apr 11, 2023
Last updated Apr 11, 2023

Severity
High

7.8/ 10

CVSS base metrics

Attack vector
Local

Attack complexity
Low

Privileges required
Low

User interaction
None

Scope
Unchanged

Confidentiality
High

Integrity
High

Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses
No CWEs

CVE ID
CVE-2023-28260

GHSA ID
GHSA-w4m3-43gp-x8hx

Source code
dotnet/runtime


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