Today we’re announcing the release of SQL Server Management Studio (SSMS) 18.3. For this update, while we added some features, our focus was primarily on fundamentals such as stability, reliability, and performance. 

We’re excited to announce the release of .NET Core 3.0. It includes many improvements, including adding Windows Forms and WPF, adding new JSON APIs, support for ARM64 and improving performance across the board. C# 8 is also part of this release, which includes nullable, async streams, and more patterns. F# 4.7 is included, and focused on relaxing syntax and targeting .NET Standard 2.0. You can start updating existing projects to target .NET Core 3.0 today. The release is compatible with previous versions, making updating easy. 

Here are a couple of the most relevant improvements you may want to verify:

• Work on the EF Core in-memory provider was finished and most query features should now be working (the majority of it went into RC1)
• EF Core’s compilation performance was improved significantly for complex queries 

Today, we’re announcing .NET Core 3.0 Release Candidate 1. Just like with Preview 9, we’ve focused on polishing .NET Core 3.0 for a final release. We are now getting very, very close. We intend to release the final version on September 23 at .NET Conf. 

Top Issues Fixed in Visual Studio 2019 version 16.2.5

• Visual Studio stops respsonding on creating a new SSIS project
• Fixed UI freezes occurring after extended usage of the editor.

Security Advisory Notices

CVE-2019-1232 Diagnostics Hub Standard Collector Service Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists when the Diagnostics Hub Standard Collector Service improperly impersonates certain file operations. An attacker who successfully exploited this vulnerability could gain elevated privileges. An attacker with unprivileged access to a vulnerable system could exploit this vulnerability. The security update addresses the vulnerability by ensuring the Diagnostics Hub Standard Collector Service properly impersonates file operations.

CVE-2019-1301: Denial of Service Vulnerability in .NET Core

A denial of service vulnerability exists when .NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core web application. The vulnerability can be exploited remotely, without authentication.

The update addresses the vulnerability by correcting how the .NET Core web application handles web requests.

Issues Fixed in 15.9.16

• Assembly does not match code for function
• System.InvalidProgramException: Common Language Runtime detected an invalid program. when instrumenting x64 projects
• Cross-EH mode inlining of noexcept code produces unexpected behavior
• Corrected issue with HTML Help Workshop failing to repair.

Security Advisory Notices

• Diagnostics Hub Standard Collector Service Elevation of Privilege Vulnerability
• Denial of Service Vulnerability in .NET Core

• Fixed: Error running the selected code generator :" value -1 is outside the acceptable [0,2147483647] range. Parameter name :value"
• Fixed: VS2019 will randomly hang while unloading projects
• Fixed: vcpkgsrv freezes VS on opening new cpp files
• Fixed an issue that caused Visual Studio 2019 to stop responding on shut down.
• Added error handling to prevent a crash when displaying tool windows with Per-Monitor awareness enabled. 

Besides all the other improvements in EF Core 3.0, preview 9 includes fixes for more than 100 issues that we resolved since Preview 8. 

To get started with ASP.NET Core in .NET Core 3.0 Preview 9 install the .NET Core 3.0 Preview 9 SDK.

If you’re on Windows using Visual Studio, install the latest preview of Visual Studio 2019.

.NET Core 3.0 Preview 9 requires Visual Studio 2019 16.3 Preview 3 or later. 

.NET Core 3.0 is supported with Visual Studio 2019 16.3 Preview 3 and Visual Studio for Mac 8.3, which were also released today.