Security Bypass Affecting microsoft.netcore.app package, versions [,2.1.22) [3.0.0,3.1.8)
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Test your applications- Snyk ID SNYK-DOTNET-MICROSOFTNETCOREAPP-610168
- published 9 Sep 2020
- disclosed 8 Sep 2020
- credit Matt Langlois of Github Security Team
Introduced: 8 Sep 2020
CVE-2020-1045 Open this link in a new tabHow to fix?
Upgrade Microsoft.NETCore.App
to version 2.1.22, 3.1.8 or higher.
Overview
Microsoft.NETCore.App is a set of .NET API's that are included in the default .NET Core application model.
Affected versions of this package are vulnerable to Security Bypass. The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded. The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names. This CVE also affects Microsoft.Owin
due to it using a similar cookie parsing mechanism.