Security Updates for Microsoft Office Online Server and Microsoft Office Web Apps (October 2020)

high Nessus Plugin ID 141421

Synopsis

The Microsoft Office Web Apps installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft Office Web Apps installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities :

- A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. (CVE-2020-16929, CVE-2020-16931, CVE-2020-16932)

Solution

Microsoft has released the following security updates to address this issue:
-KB4486689
-KB4486674
-KB4462175

See Also

http://www.nessus.org/u?29683456

http://www.nessus.org/u?998c805a

http://www.nessus.org/u?1a69c896

Plugin Details

Severity: High

ID: 141421

File Name: smb_nt_ms20_oct_office_web.nasl

Version: 1.7

Type: local

Agent: windows

Published: 10/13/2020

Updated: 12/5/2022

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2020-16932

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/a:microsoft:office_web_apps

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 10/13/2020

Vulnerability Publication Date: 10/13/2020

Reference Information

CVE: CVE-2020-16929, CVE-2020-16931, CVE-2020-16932

IAVA: 2020-A-0454-S

MSFT: MS20-4462175, MS20-4486674, MS20-4486689

MSKB: 4462175, 4486674, 4486689