Security Update for Microsoft ASP.NET Core (September 2020)

Medium Nessus Plugin ID 140425

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 3.6

Synopsis

The Microsoft ASP.NET Core installations on the remote host contain vulnerable packages.

Description

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.

Solution

Update ASP.NET Core, remove vulnerable packages and refer to vendor advisory.

See Also

https://dotnet.microsoft.com/download/dotnet-core/2.1

https://dotnet.microsoft.com/download/dotnet-core/3.1

https://github.com/dotnet/announcements/issues/165

http://www.nessus.org/u?9bcbab3f

Plugin Details

Severity: Medium

ID: 140425

File Name: smb_nt_ms20_sep_aspdotnet_core.nasl

Version: 1.3

Type: local

Agent: windows

Family: Windows

Published: 2020/09/08

Updated: 2020/09/11

Dependencies: 104667

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS Score Source: CVE-2020-1045

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:aspnet_core

Required KB Items: installed_sw/ASP .NET Core Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 2020/09/08

Vulnerability Publication Date: 2020/09/08

Reference Information

CVE: CVE-2020-1045

IAVA: 2020-A-0415