Summary

Vulnerability in Microsoft.NetCore.App.Runtime.win-arm (CVE-2023-28260). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 6.0.16 or later.

Original description

The description as published by the source.

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 https://github.com/dotnet/announcements/issues/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 lik…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2023-28260 has been found in Microsoft.NetCore.App.Runtime.win-arm.
Successful exploitation can lead to full system takeover.
What to do: upgrade Microsoft.NetCore.App.Runtime.win-arm to 6.0.16 or later.
If unsure, ask your IT team or search "Microsoft.NetCore.App.Runtime.win-arm CVE-2023-28260" on the vendor's site.

CVE-2023-28260 (Microsoft.NetCore.App.Runtime.win-arm)
Attack vector: local / no user interaction
Patched: 6.0.16 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in Microsoft.NetCore.App.Runtime.win-arm.

📍 Affected scope

Check the vendor advisory for the affected versions of Microsoft.NetCore.App.Runtime.win-arm.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 6.0.16.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Microsoft.NetCore.App.Runtime.win-arm' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'Microsoft.NetCore.App.Runtime.win-arm' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Microsoft.NetCore.App.Runtime.win-arm を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade Microsoft.NetCore.App.Runtime.win-arm to 6.0.16
```
ステージング環境で 6.0.16 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

NuGet Microsoft.NetCore.App.Runtime.win-arm

[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.0.16"}]}]

NuGet Microsoft.NetCore.App.Runtime.win-arm64

[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.0.16"}]}]

NuGet Microsoft.NetCore.App.Runtime.win-x86

[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.0.16"}]}]

NuGet Microsoft.NetCore.App.Runtime.win-x64

[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.0.5"}]}]

Summary

Original description

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

Executive summary

Announcement

Mitigation factors

Affected software

Advisory FAQ

How do I know if I am affected?

How do I fix the issue?

Auto-generated summary

Response actions

Affected packages

References