Detections
Analytics

Security Updates for Microsoft SharePoint Server 2019 (December 2020)

critical Nessus Plugin ID 144056

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Synopsis

The Microsoft SharePoint Server 2019 installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities :

 - An elevation of privilege vulnerability. An attacker can exploit this to gain elevated privileges.
 (CVE-2020-17089)

 - A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2020-17118, CVE-2020-17121)

 - An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2020-17120)

 - A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2020-17115)

Solution

Microsoft has released the following security updates to address this issue:
-KB4486751
 -KB4486752
 -KB4493231

See Also

http://www.nessus.org/u?c153ce68

http://www.nessus.org/u?e3432e77

Plugin Details

Severity: Critical

ID: 144056

File Name: smb_nt_ms20_dec_office_sharepoint_2019.nasl

Version: 1.13

Type: local

Agent: windows

Published: 12/10/2020

Updated: 8/29/2025

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

CVSS Score Source: CVE-2020-17118

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_server:2019

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/8/2020

Vulnerability Publication Date: 12/8/2020

Reference Information

CVE: CVE-2020-17089, CVE-2020-17115, CVE-2020-17118, CVE-2020-17120, CVE-2020-17121

IAVA: 2020-A-0560-S

MSFT: MS20-4486751, MS20-4486752, MS20-4493231

MSKB: 4486751, 4486752, 4493231