Input validation error in Microsoft products - CVE-2021-1721

Vulnerability identifier: #VU50494

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-1721

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 .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
Arch Linux
Red Hat Enterprise Linux for x86_64
Anolis OS
Fedora
rh-dotnet21 (Red Hat package)
rh-dotnet31-dotnet (Red Hat package)
dotnet3.1 (Red Hat package)
rh-dotnet50-dotnet (Red Hat package)
dotnet5.0 (Red Hat package)
dotnet-runtime-2.1
dotnet-host-fxr-2.1
rh-dotnet21-dotnet (Red Hat package)
dotnet (Red Hat package)
dotnet-sdk-2.1.5xx
dotnet-sdk-2.1
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
dotnet3.1
dotnet-sdk-3.1
dotnet-sdk-3.1-source-built-artifacts
dotnet-templates-3.1
dotnet5.0

Install updates from vendor's website.

rh-dotnet21 (Red Hat package) - update to 2.1-24.el7_9
rh-dotnet31-dotnet (Red Hat package) - update to 3.1.112-1.el7_9
dotnet3.1 (Red Hat package) - update to 3.1.112-1.el8_3
rh-dotnet50-dotnet (Red Hat package) - update to 5.0.103-1.el7_9
dotnet5.0 (Red Hat package) - update to 5.0.103-1.el8_3
dotnet-runtime-2.1 - update to 2.1.30-1
dotnet-host-fxr-2.1 - update to 2.1.30-1
rh-dotnet21-dotnet (Red Hat package) - update to 2.1.521-1.el7_9
dotnet (Red Hat package) - update to 2.1.521-1.el8_3
dotnet-sdk-2.1.5xx - update to 2.1.526-1
dotnet-sdk-2.1 - update to 2.1.526-1
dotnet-targeting-pack-3.1 - update to 3.1.26-1.0.1
dotnet-runtime-3.1 - update to 3.1.26-1.0.1
dotnet-hostfxr-3.1 - update to 3.1.26-1.0.1
dotnet-apphost-pack-3.1 - update to 3.1.26-1.0.1
aspnetcore-targeting-pack-3.1 - update to 3.1.26-1.0.1
aspnetcore-runtime-3.1 - update to 3.1.26-1.0.1
dotnet3.1 - addressed in versions 3.1.112-1.fc32, 3.1.112-1.fc33
dotnet-sdk-3.1 - update to 3.1.420-1.0.1
dotnet-sdk-3.1-source-built-artifacts - update to 3.1.420-1.0.1
dotnet-templates-3.1 - update to 3.1.420-1.0.1
dotnet5.0 - addressed in versions 5.0.103-1.fc32, 5.0.103-1.fc33

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1721

• Multiple vulnerabilities in Microsoft .NET Core and Visual Studio
• Red Hat Enterprise Linux update for rh-dotnet21-dotnet
• Red Hat Enterprise Linux 8 update for .NET Core 3.1
• Red Hat Enterprise Linux update for rh-dotnet31-dotnet
• Red Hat Enterprise Linux update for rh-dotnet50-dotnet
• Red Hat Enterprise Linux 8 update for .NET Core 2.1
• Red Hat Enterprise Linux 8 update for .NET 5.0
• Arch Linux update for dotnet-runtime
• Arch Linux update for dotnet-sdk
• Fedora 33 update for dotnet5.0
• Fedora 32 update for dotnet3.1
• Fedora 33 update for dotnet3.1
• Fedora 32 update for dotnet5.0
• Anolis OS update for dotnet
• Anolis OS update for dotnet3.1