Input validation error in ASP.NET Core MVC and Visual Studio - CVE-2021-1723

Vulnerability identifier: #VU49404

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-2021-1723

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. 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
Arch Linux
Red Hat Enterprise Linux for x86_64
Fedora
rh-dotnet31-dotnet (Red Hat package)
dotnet3.1 (Red Hat package)
dotnet3.1
rh-dotnet50-dotnet (Red Hat package)
dotnet5.0 (Red Hat package)

Install updates from vendor's website.

rh-dotnet31-dotnet (Red Hat package) - update to 3.1.111-1.el7_9
dotnet3.1 (Red Hat package) - update to 3.1.111-1.el8_3
dotnet3.1 - addressed in versions 3.1.111-1.fc32, 3.1.111-1.fc33
rh-dotnet50-dotnet (Red Hat package) - update to 5.0.102-1.el7_9
dotnet5.0 (Red Hat package) - update to 5.0.102-2.el8_3

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1723

• Denial of service in Microsoft ASP.NET Core and Visual Studio
• Red Hat Enterprise Linux 8 update for .NET 5.0
• Red Hat Enterprise Linux 8 update for .NET Core 3.1
• Red Hat update for .NET 5.0 on Red Hat Enterprise Linux
• Red Hat update for .NET Core 3.1
• Arch Linux update for dotnet-runtime
• Arch Linux update for dotnet-sdk
• Fedora 33 update for dotnet3.1
• Fedora 32 update for dotnet3.1