Detections
Analytics

Security Update for .NET Core SDK (February 2021)

medium Nessus Plugin ID 146346

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Synopsis

The remote Windows host is affected by a .NET Core SDK denial of service vulnerability.

Description

The Microsoft .NET Core SDK installation on the remote host is version 2.1.x prior to 2.1.521, 2.1.6xx prior to 2.1.813, 3.1.x prior to 3.1.112, 3.1.2xx prior to 3.1.406, or 5.x prior to 5.0.103. It is, therefore, affected by a denial of service vulnerability when creating HTTPS web requests during X509 certificate chain building. An unauthenticated, remote attacker can exploit this to cause the application to stop responding.

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

Solution

Update .NET Core SDK, 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://dotnet.microsoft.com/download/dotnet/5.0

https://github.com/dotnet/announcements/issues/175

http://www.nessus.org/u?2455d834

http://www.nessus.org/u?a75f459e

http://www.nessus.org/u?51c16faa

Plugin Details

Severity: Medium

ID: 146346

File Name: smb_nt_ms21_feb_dotnet_core_sdk.nasl

Version: 1.4

Type: local

Agent: windows

Family: Windows

Published: 2/9/2021

Updated: 6/11/2021

Configuration: Enable paranoid mode

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2021-1721

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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: Settings/ParanoidReport, installed_sw/.NET Core SDK Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 2/9/2021

Vulnerability Publication Date: 2/9/2021

Reference Information

CVE: CVE-2021-1721

IAVA: 2021-A-0091-S