CVE-2025-24070

Summary

Microsoft Security Advisory CVE-2025-24070: .NET Elevation of Privilege Vulnerability Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 9.0, ASP.NET Core 8.0, ASP.NET Core 6.0, and ASP.NET Core 2.3. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability. A vulnerability exists in ASP.NET Core applications calling RefreshSignInAsync with an improperly authenticated user parameter that could allow an attacker to sign into another user's account, resulting in Elevation of Privilege. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/348 Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. Affected software Any ASP.NET Core 9.0 application running on ASP.NET Core 9.0.2 or earlier. Any ASP.NET Core application running on ASP.NET Core 8.0.13 or earlier. Any ASP.NET Core application running on ASP.NET Core 6.0.36 or earlier. Any ASP.NET Core 2.x application consuming the package Microsoft.AspNetCore.Identity version 2.3.0 or earlier. Affected Packages The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below | Package name | Affected version | Patched version | | --- | --- | --- | | Microsoft.AspNetCore.Identity | 2.3.0 | 2.3.1 | ASP.NET Core 9 | Package name | Affected version | Patched version | | --- | --- | --- | | Microsoft.AspNetCore.App.Runtime.linux-arm | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.win-arm | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.win-x64 | >= 9.0.0, <= 9.0.2 | 9.0.3 | | Microsoft.AspNetCore.App.Runtime.win-x86 | >= 9.0.0, <= 9.0.2 | 9.0.3 | ASP.NET Core 8 | Package name | Affected version | Patched version | | --- | --- | --- | | Microsoft.AspNetCore.App.Runtime.linux-arm | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.win-arm | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.win-x64 | >= 8.0.0, <= 8.0.13 | 8.0.14 | | Microsoft.AspNetCore.App.Runtime.win-x86 | >= 8.0.0, <= 8.0.13 | 8.0.14 | ASP.NET Core 6 | Package name | Affected version | Patched version | | --- | --- | --- | | Microsoft.AspNetCore.App.Runtime.linux-arm | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.win-arm | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.win-x64 | >= 6.0.0, <= 6.0.36 | none | | Microsoft.AspNetCore.App.Runtime.win-x86 | >= 6.0.0, <= 6.0.36 | none | 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 or affected packages, you're exposed to the vulnerability. How do I fix the issue? To fix the issue please install the latest version of .NET 9.0. 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 your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the dotnet --info command. You will see output like the following: If you're using .NET 9.0, you should download and install .NET 9.0.3 Runtime or .NET 9.0.103 SDK (for Visual Studio 2022 v17.12 latest Preview) from https://dotnet.microsoft.com/download/dotnet-core/9.0. 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 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 8.0 or .NET 9.0, please email details to [email protected]. 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/aspnetcore. 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. External Links Acknowledgement Zahid TOKAT CVE-2025-24070

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