CVE-2018-8409 Denial of service vulnerability exists when System.IO.Pipelines improperly handles requests

What is CVE-2018-8409?

CVE-2018-8409 is a high-severity denial of service vulnerability in Microsoft .NET Core, published on 13 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A denial of service vulnerability exists when System.IO.Pipelines improperly handles requests, aka "System.IO.Pipelines Denial of Service." This affects .NET Core 2.1, System.IO.Pipelines, ASP.NET Core 2.1.

Which versions are affected by CVE-2018-8409?

6 open source packages ship an affected version, including Microsoft.AspNetCore.All, Microsoft.AspNetCore.App and System.IO.Pipelines. It affects 3 products.

Products include Microsoft .Net Core, Microsoft Asp.net Core, Microsoft System.io.pipelines.

How do I fix CVE-2018-8409?

Upgrade Microsoft.AspNetCore.All to 2.1.4 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-8409 being exploited?

There is no known exploitation of CVE-2018-8409 in the wild and no public exploit code.

Other vulnerabilities in Microsoft .NET Core

• CVE-2020-1147 Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Exploited High 7.8
• CVE-2020-0605 Code injection in .NET Core High 8.8
• CVE-2020-0606 Remote code execution in Microsoft.WindowsDesktop.App.Ref High 8.8
• CVE-2019-1301 High severity vulnerability that affects System.Management.Automation High 7.5
• CVE-2019-0820 Regular Expression Denial of Service in System.Text.RegularExpressions High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-j378-6mmw-hqfr.