Security Update for .NET Core (January 2021)

high Nessus Plugin ID 145041

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Synopsis

The remote Windows host is affected by a .NET Core denial of service (DoS) vulnerability.

Description

The Microsoft .NET Core installation on the remote host is version 3.1.x < 3.1.11 or 5.x prior to 5.0.2. It is, therefore, affected by a denial of service (DoS) vulnerability in the way Kestrel parses HTTP/2 requests. An unauthenticated, remote attacker can exploit this issue, by sending a specially crafted requests to the .NET Core application, to cause a DoS condition.

Solution

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

Plugin Details

Severity: High

ID: 145041

File Name: smb_nt_ms21_jan_dotnet_core.nasl

Version: 1.3

Type: local

Agent: windows

Family: Windows

Published: 1/18/2021

Updated: 12/7/2022

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-1723

CVSS v3

Risk Factor: High

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:N/A:H

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

Vulnerability Information

CPE: cpe:/a:microsoft:.net_core

Required KB Items: installed_sw/.NET Core Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 1/12/2021

Vulnerability Publication Date: 1/12/2021

Reference Information

CVE: CVE-2021-1723

Detections

Analytics