Microsoft Security Advisory CVE-2023-33170: .NET Security Feature Bypass Vulnerability
Date: 2023-07
Affected: nuget/Microsoft.AspNetCore.App.Runtime.osx-arm64, nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64, nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2023-33170
CWE: CWE-362
CVSS: 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

# Microsoft Security Advisory CVE-2023-33170: .NET Security Feature Bypass Vulnerability ## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 2.1 and above. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exist in ASP.NET Core applications where account lockout maximum failed attempts may not be immediately updated, allowing an attacker to try more passwords. ## Discussion Discussion for this issue can be found at https://github.com/dotnet/aspnetcore/issues/49334 ### Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. ## Affected software * Any ASP.NET 7.0 application running on .NET 7.0.8 or earlier. * Any ASP.NET 6.0 application running on .NET 6.0.19 or earlier. * Any ASP.NET Core 2.1 application consuming the package Microsoft.AspNetCore.Identity version 2.1.31 or earlier. If your application uses the following package versions, ensure you update to the latest version of .NET. ### ASP.NET Core 2.1 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [ Microsoft.AspNetCore.Identity](https://www.nuget.org/packages/Microsoft.AspNetCore.Identity/2.1.39) | <=2.1.39 | 2.1.39 ### Microsoft.AspNet.Identity.Owin Package name | Affected version | Patched version ------------ | ---------------- | -------


Mitigations:

Architectural layers (MAESTRO):