ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

An update of the dotnet package has been released.

The version of Microsoft .NET Core SDK installed on the remote host is 6.0.x prior to 6.0.121, 6.0.x prior to 6.0.316, 6.0.x prior to 6.0.413, 7.0.x prior to 7.0.110 or 7.0.x prior to 307. It is, therefore, affected by multiple vulnerabilities, as follows:

  - A vulnerability exists when some dotnet commands are used in directories with weaker permissions which   can result in remote code execution. (CVE-2023-35390)   
  - A vulnerability exists in .NET 6.0 and .NET 7.0 applications using SignalR when redis backplane use might   result in information disclosure. (CVE-2023-35391)

  - A vulnerability exists in Kestrel where, on detecting a potentially malicious client, Kestrel will   sometimes fail to disconnect it, resulting in denial of service. (CVE-2023-38180)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft Visual Studio Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - .NET Core and Visual Studio Denial of Service Vulnerability. (CVE-2023-38178)

  - .NET and Visual Studio Remote Code Execution Vulnerability. (CVE-2023-35390)

  - .NET and Visual Studio Denial of Service Vulnerability. (CVE-2023-38180)

  - ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability. (CVE-2023-35391)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 2023_Aug_08 advisory.

  - .NET and Visual Studio Remote Code Execution Vulnerability (CVE-2023-35390)

  - ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability (CVE-2023-35391)

  - .NET Core and Visual Studio Denial of Service Vulnerability (CVE-2023-38178)

  - .NET and Visual Studio Denial of Service Vulnerability (CVE-2023-38180)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
237067	Photon OS 4.0: Dotnet PHSA-2025-4.0-0804	Nessus	PhotonOS Local Security Checks	high
234310	Photon OS 5.0: Dotnet PHSA-2025-5.0-0499	Nessus	PhotonOS Local Security Checks	critical
180502	Security Update for .NET Core SDK (August 2023)	Nessus	Windows	high
179645	Security Updates for Microsoft Visual Studio Products (August 2023)	Nessus	Windows : Microsoft Bulletins	high
179502	Security Update for Microsoft .NET Core (August 2023)	Nessus	Windows	high

Detections

Analytics

CVE-2023-35391

high

Tenable Plugins

high

critical

high

high

high