CVE-2024-35264

Microsoft Security Advisory CVE-2024-35264 | .NET Remote Code Execution Vulnerability

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

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A Vulnerability exists in ASP.NET Core 8 where Data Corruption in Kestrel HTTP/3 can result in remote code execution.

Note: HTTP/3 is experimental in .NET 6.0. If you are on .NET 6.0 and using HTTP/3, please upgrade to .NET 8.0.7

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/314

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

Microsoft has not identified any mitigating factors for this vulnerability.

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

• Any .NET 8.0 application running on .NET 8.0.6 or earlier.

<a name="affected-packages"></a>Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

<a name="ASP.NET 8"></a>ASP.NET 8

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.App.Runtime.linux-arm | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.linux-x64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.osx-x64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.win-arm | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.win-arm64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.win-x64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.AspNetCore.App.Runtime.win-x86 | >=8.0.0, <= 8.0.6 | 8.0.7

Advisory FAQ

<a name="how-affected"></a>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 or affected packages, you're exposed to the vulnerability.

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

• To fix the issue please install the latest version of .NET 8.0 or .NET 7.0 or .NET 6.0. 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…

.NET and Visual Studio Remote Code Execution Vulnerability

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)
• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)
• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)
• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)
• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET and Visual Studio Remote Code Execution Vulnerability

.NET and Visual Studio Remote Code Execution Vulnerability

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)

• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)

• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

It was discovered that .NET did not properly handle object deserialization. An attacker could possibly use this issue to cause a denial of service. (CVE-2024-30105)

Radek Zikmund discovered that .NET did not properly manage memory. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2024-35264)

It was discovered that .NET did not properly parse X.509 Content and ObjectIdentifiers. An attacker could possibly use this issue to cause a denial of service. (CVE-2024-38095)