Security Update for .NET Core SDK (October 2023)

high Nessus Plugin ID 182917

Synopsis

The remote Windows host is affected by multiple Microsoft .NET Core SDK vulnerabilities.

Description

The version of Microsoft .NET Core SDK installed on the remote host is 6.0.x prior to 6.0.123, 6.0.x prior to 6.0.318, 6.0.x prior to 6.0.414, 7.0.x prior to 7.0.112 or 7.0.x prior to 7.0.309 or 7.0.x prior to 7.0.402.
It is, therefore, affected by multiple vulnerabilities, as follows:

- A vulnerability exists in the ASP.NET Core Kestrel web server where a malicious client may flood the server with specially crafted HTTP/2 requests, causing denial of service. (CVE-2023-44487)
- A null pointer vulnerability exists in MsQuic.dll which may lead to Denial of Service. This issue only affects Windows systems. (CVE-2023-38171)

- A memory leak vulnerability exists in MsQuic.dll which may lead to Denial of Service. This issue only affects Windows systems. (CVE-2023-36435)

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 5031900 and 5031901.

See Also

https://dotnet.microsoft.com/download/dotnet/6.0

https://dotnet.microsoft.com/download/dotnet/7.0

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36435

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-44487

http://www.nessus.org/u?327d233f

http://www.nessus.org/u?b24a5373

Plugin Details

Severity: High

ID: 182917

File Name: smb_nt_ms23_oct_dotnet_core_sdk.nasl

Version: 1.8

Type: local

Agent: windows

Family: Windows

Published: 10/11/2023

Updated: 2/23/2024

Configuration: Enable paranoid mode

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.4

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

CVSS Score Source: CVE-2023-44487

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7

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:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:.net_core

Required KB Items: Settings/ParanoidReport, installed_sw/.NET Core SDK Windows

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/10/2023

Vulnerability Publication Date: 10/10/2023

CISA Known Exploited Vulnerability Due Dates: 10/31/2023

Reference Information

CVE: CVE-2023-36435, CVE-2023-38171, CVE-2023-44487

IAVA: 2023-A-0543-S

IAVB: 2023-B-0083-S

MSFT: MS23-5031900, MS23-5031901

MSKB: 5031900, 5031901