.NET Information Disclosure Vulnerability
Date: 2023-08
Affected: nuget/Microsoft.AspNetCore.SignalR.Redis, nuget/Microsoft.AspNetCore.SignalR.StackExchangeRedis, nuget/Microsoft.AspNetCore.SignalR.StackExchangeRedis
Attack vector: info-disclosure
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2023-35391
CWE: CWE-200
CVSS: 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)

# Microsoft Security Advisory CVE-2023-35391: .NET Information Disclosure Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET core 2.1, .NET 6.0 and, .NET 7.0. 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 2.1, .NET 6.0 and, .NET 7.0 applications using SignalR when redis backplane use might result in information disclosure. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/267 ### <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 7.0 application running on .NET 7.0.9 or earlier. * Any .NET 6.0 application running on .NET 6.0.20 or earlier. If your application uses the following package versions, ensure you update to the latest version of .NET. ### <a name=".NET 7"></a>.NET 7 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.AspNetCore.SignalR.StackExchangeRedis](https://www.nuget.org/packages/Microsoft.AspNetCore.SignalR.StackExchangeRedis) | >= 7.0.0, <= 7.0.9 | 7.0.10 ### <a name=".NET 6"></a>.NET 6 Package name | Affected version | Patched version ------------


Mitigations:

Architectural layers (MAESTRO):