Security Update for .NET Core SDK (June 2021)

high Nessus Plugin ID 150365
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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 3.1.x prior to 3.1.116, 3.1.2xx prior to 3.1.410, 5.x prior to 5.0.204, or 5.0.3xx prior to 5.0.301. It is, therefore, affected by a denial of service vulnerability. 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/3.1

https://dotnet.microsoft.com/download/dotnet/5.0

http://www.nessus.org/u?cf839a13

http://www.nessus.org/u?1c41b94c

Plugin Details

Severity: High

ID: 150365

File Name: smb_nt_ms21_jun_dotnet_core_sdk.nasl

Version: 1.5

Type: local

Agent: windows

Family: Windows

Published: 6/8/2021

Updated: 8/12/2021

Dependencies: microsoft_dotnet_core_sdk_win.nbin

Risk Information

CVSS Score Source: CVE-2021-31957

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

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: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:.net_core

Required KB Items: installed_sw/.NET Core SDK Windows

Exploit Ease: No known exploits are available

Patch Publication Date: 6/8/2021

Vulnerability Publication Date: 6/8/2021

Reference Information

CVE: CVE-2021-31957

IAVA: 2021-A-0274-S