high
7.5
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2020-1045: Microsoft ASP.NET Core Security Feature Bypass Vulnerability

First published: Fri Aug 28 2020(Updated: )

<p>A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.</p> <p>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.</p> <p>The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.</p>

Credit: secure@microsoft.com secure@microsoft.com secure@microsoft.com

Affected SoftwareAffected VersionHow to fix
nuget/Microsoft.AspNetCore.Http<2.1.22
2.1.22
nuget/Microsoft.AspNetCore.App.Runtime.win-arm64>=3.1.5<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.win-x86>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.win-x64>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.win-arm>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.osx-x64>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.linux-x64>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.linux-arm64>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.AspNetCore.App.Runtime.linux-arm>=3.1.0<3.1.8
3.1.8
nuget/Microsoft.Owin<4.1.1
4.1.1
nuget/Microsoft.AspNetCore.App<=2.1.21
2.1.22
Microsoft ASP.NET Core>=2.1<=2.1.21
Microsoft ASP.NET Core>=3.1<3.1.8
Fedoraproject Fedora=32
Fedoraproject Fedora=33
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Aus=8.2
Redhat Enterprise Linux Aus=8.4
Redhat Enterprise Linux Aus=8.6
Redhat Enterprise Linux Eus=8.2
Redhat Enterprise Linux Eus=8.4
Redhat Enterprise Linux Eus=8.6
Redhat Enterprise Linux Tus=8.2
Redhat Enterprise Linux Tus=8.4
Redhat Enterprise Linux Tus=8.6
>=2.1<=2.1.21
>=3.1<3.1.8
=32
=33
=8.0
=8.2
=8.4
=8.6
=8.2
=8.4
=8.6
=8.2
=8.4
=8.6

Remedy

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-1045?

    CVE-2020-1045 is a security feature bypass vulnerability in Microsoft ASP.NET Core.

  • What is the severity of CVE-2020-1045?

    The severity of CVE-2020-1045 is high (7.5).

  • Which software is affected by CVE-2020-1045?

    Microsoft ASP.NET Core versions 2.1.21 to 2.1 and 3.1.8 to 3.1 are affected by CVE-2020-1045.

  • How does CVE-2020-1045 work?

    CVE-2020-1045 allows a malicious attacker to set a second cookie with a percent-encoded name by exploiting how ASP.NET Core parses encoded cookie names.

  • How can I fix CVE-2020-1045?

    Update to the patched versions of Microsoft ASP.NET Core (2.1.21 or later for 2.1.x versions, 3.1.8 or later for 3.1.x versions).

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