6.2

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3.1

-

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CVE-2023-36558

CVE-2023-36558: Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

<a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 6.0, ASP.NET Core 7.0 and, ASP.NET Core 8.0 RC2. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability.

A security feature bypass vulnerability exists in ASP.NET where an unauthenticated user is able to bypass validation on Blazor server forms which could trigger unintended actions.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/288

<a name="mitigation-factors"></a>Mitigation factors

This vulnerability only affects ASP.NET Core Blazor apps. Other application types, including ASP.NET Core apps which do not utilize Blazor, are not affected.

<a name="affected-software"></a>Affected software

Any ASP.NET Core Blazor 6.0 application running on .NET 6.0.24 or earlier.
Any ASP.NET Core Blazor 7.0 application running on .NET 7.0.13 or earlier.
Any ASP.NET Core Blazor 8.0 application running on .NET 8.0 RC2.

If your application uses the following package versions, ensure you update to the latest version of .NET.

<a name=".NET 7"></a>.NET 8.0

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Components | 8.0.0-rc.2.23480.2 | 8.0.0

<a name=".NET 7"></a>.NET 7.0

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Components | >= 7.0.0, < 7.0.13> | 7.0.14

<a name=".NET 7"></a>.NET 6.0

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- | >= 6.0.0, < 6.0.24 | 6.0.25

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CVE-2023-36558

CVE-2023-36558:

6.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Microsoft.AspNetCore.Components	nuget	= 8.0.0-rc.2.23480.2	8.0.0
Microsoft.AspNetCore.Components	nuget	>= 7.0.0, <= 7.0.13	7.0.14

Technical Details

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Root Cause Analysis

The advisory describes a security feature bypass in Blazor server forms validation but does not provide specific code references, commit diffs, or function names. While the vulnerability clearly relates to form validation mechanisms in ASP.NET Core Blazor (likely involving antiforgery token validation or authentication checks during form submission), the provided materials lack technical details about the exact implementation flaw. Without access to patch diffs or explicit documentation of affected functions in Microsoft.AspNetCore.Components, we cannot confidently identify specific vulnerable functions with high certainty.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Rule

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Reasoning

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6.2

-

Basic Information

Basic Information

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CVE-2023-36558: Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

<a name="executive-summary"></a>Executive summary

Announcement

<a name="mitigation-factors"></a>Mitigation factors

<a name="affected-software"></a>Affected software

<a name=".NET 7"></a>.NET 8.0

<a name=".NET 7"></a>.NET 7.0

<a name=".NET 7"></a>.NET 6.0

CVE-2023-36558:

6.2

-

Basic Information

Basic Information

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Technical Details

Technical Details

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Root Cause Analysis

Vulnerable functions

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WAF Rule

Reasoning

6.2

6.2

Basic Information

Basic Information

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

CVE-2023-36558: Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

Microsoft Security Advisory CVE-2023-36558: .NET Security Feature Bypass Vulnerability

<a name="executive-summary"></a>Executive summary

Announcement

<a name="mitigation-factors"></a>Mitigation factors

<a name="affected-software"></a>Affected software

<a name=".NET 7"></a>.NET 8.0

<a name=".NET 7"></a>.NET 7.0

<a name=".NET 7"></a>.NET 6.0

Technical Details

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

<a name="how-fix"></a>How do I fix the issue?

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