Security Update for .NET Core (July 2020)

high Nessus Plugin ID 138465
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 remote code execution (RCE) vulnerability.

Description

The Microsoft .NET Core installation on the remote host is version 2.1.x < 2.1.20 or 3.1.x < 3.1.6. It is, therefore, affected by a remote code execution (RCE) vulnerability due to failing to check the source markup of XML file input. An unauthenticated, remote attacker can exploit this, by issuing specially crafted requests to applications that process certain types of XML, to execute arbitrary code in the context of the current user.

Solution

Refer to vendor documentation.

See Also

http://www.nessus.org/u?43ad1c2a

https://github.com/dotnet/announcements/issues/159

Plugin Details

Severity: High

ID: 138465

File Name: smb_nt_ms20_jul_dotnet_core.nasl

Version: 1.11

Type: local

Agent: windows

Family: Windows

Published: 7/14/2020

Updated: 1/21/2022

Dependencies: microsoft_dotnet_core_win.nbin

Risk Information

CVSS Score Source: CVE-2020-1147

VPR

Risk Factor: Critical

Score: 9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:.net_core

Required KB Items: installed_sw/.NET Core Windows

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/14/2020

Vulnerability Publication Date: 7/14/2020

Exploitable With

Metasploit (SharePoint DataSet / DataTable Deserialization)

Reference Information

CVE: CVE-2020-1147

IAVA: 2020-A-0304-S