A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names. 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.

The remote NewStart CGSL host, running version MAIN 6.02, has dotnet3.1 packages installed that are affected by a vulnerability:

  - A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie     names.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., aka 'Microsoft ASP.NET Core     Security Feature Bypass Vulnerability'. (CVE-2020-1045)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update updates .NET Core 3.1 to SDK 3.1.108 and Runtime 3.1.8.

This update includes a fix for CVE-2020-1045

Release Notes:
https://github.com/dotnet/core/blob/master/release-notes/3.1/3.1.8/3.1 .8.md

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2020-3699 advisory. Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2020:3697 advisory.

  - dotnet: ASP.NET cookie prefix spoofing vulnerability (CVE-2020-1045)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2020:3699 advisory.

  - dotnet: ASP.NET cookie prefix spoofing vulnerability (CVE-2020-1045)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft ASP.NET Core installation on the remote host is version 2.1.x < 2.1.22, or 3.1.x < 3.1.8. It is, therefore, affected by a security feature bypass vulnerability in the way ASP.NET Core parses encoded cookie names. An unauthenticated, remote attacker can exploit this issue, by sending a specially crafted cookies to the ASP.NET Core application to set a second cookie.

ID	Name	Product	Family	Severity
147317	NewStart CGSL MAIN 6.02 : dotnet3.1 Vulnerability (NS-SA-2021-0078)	Nessus	NewStart CGSL Local Security Checks	high
141267	Fedora 33 : dotnet3.1 (2020-48fa1ad65c)	Nessus	Fedora Local Security Checks	high
140625	Fedora 32 : dotnet3.1 (2020-e2deb72e0f)	Nessus	Fedora Local Security Checks	high
140498	Oracle Linux 8 : .NET / Core / 3.1 (ELSA-2020-3699)	Nessus	Oracle Linux Local Security Checks	high
140435	RHEL 7 : .NET Core 3.1 security and bugfix update for Red Hat Enterprise Linux (Important) (RHSA-2020:3697)	Nessus	Red Hat Local Security Checks	high
140434	RHEL 8 : .NET Core 3.1 (RHSA-2020:3699)	Nessus	Red Hat Local Security Checks	high
140425	Security Update for Microsoft ASP.NET Core (September 2020)	Nessus	Windows	high

Detections

Analytics

CVE-2020-1045

high

Tenable Plugins

high

high

high

high

high

high

high