Input validation error in Microsoft products - CVE-2021-26423

Vulnerability identifier: #VU55694

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-26423

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the .NET Core and Visual Studio. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

ASP.NET Core MVC
Visual Studio
Microsoft .NET Core
rh-dotnet31-dotnet (Red Hat package)
dotnet3.1 (Red Hat package)
rh-dotnet50-dotnet (Red Hat package)
dotnet5.0 (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
dotnet-targeting-pack-3.1
dotnet-runtime-3.1
dotnet-hostfxr-3.1
dotnet-apphost-pack-3.1
aspnetcore-targeting-pack-3.1
aspnetcore-runtime-3.1
dotnet-templates-3.1
dotnet-sdk-3.1
dotnet-targeting-pack-5.0
dotnet-runtime-5.0
dotnet-hostfxr-5.0
dotnet-apphost-pack-5.0
dotnet-templates-5.0
dotnet-sdk-5.0-source-built-artifacts
dotnet-sdk-5.0
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS

Install updates from vendor's website.

rh-dotnet31-dotnet (Red Hat package) - update to 3.1.118-1.el7_9
dotnet3.1 (Red Hat package) - update to 3.1.118-1.el8_4
rh-dotnet50-dotnet (Red Hat package) - update to 5.0.206-1.el7_9
dotnet5.0 (Red Hat package) - update to 5.0.206-1.el8_4
dotnet-targeting-pack-3.1 - update to 3.1.22-3.0.1
dotnet-runtime-3.1 - update to 3.1.22-3.0.1
dotnet-hostfxr-3.1 - update to 3.1.22-3.0.1
dotnet-apphost-pack-3.1 - update to 3.1.22-3.0.1
aspnetcore-targeting-pack-3.1 - update to 3.1.22-3.0.1
aspnetcore-runtime-3.1 - update to 3.1.22-3.0.1
dotnet-templates-3.1 - update to 3.1.416-3.0.1
dotnet-sdk-3.1 - update to 3.1.416-3.0.1
dotnet-targeting-pack-5.0 - update to 5.0.14-1.0.1
dotnet-runtime-5.0 - update to 5.0.14-1.0.1
dotnet-hostfxr-5.0 - update to 5.0.14-1.0.1
dotnet-apphost-pack-5.0 - update to 5.0.14-1.0.1
dotnet-templates-5.0 - update to 5.0.211-1.0.1
dotnet-sdk-5.0-source-built-artifacts - update to 5.0.211-1.0.1
dotnet-sdk-5.0 - update to 5.0.211-1.0.1

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423

• Multiple vulnerabilities in Microsoft .NET Core and Visual Studio
• Red Hat Enterprise Linux 8.4 update for .NET Core 3.1
• .NET Core on Red Hat Enterprise Linux update for .NET Core 3.1
• .NET Core on Red Hat Enterprise Linux update for rh-dotnet50-dotnet
• Red Hat Enterprise Linux 8 update for .NET 5.0
• Anolis OS update for dotnet5.0
• Anolis OS update for dotnet3.1