Security Updates for Microsoft Office Web Apps (July 2021)

high Nessus Plugin ID 151608

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 the following vulnerabilities:

- Multiple remote code execution vulnerabilities in Microsoft Excel. (CVE-2021-34501, CVE-2021-34518)

- A spoofing vulnerability in Microsoft Office Online Server. (CVE-2021-34451).

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Microsoft has released the following security updates to address this issue:
-KB5001973
-KB5001986

See Also

http://www.nessus.org/u?8597074a

http://www.nessus.org/u?9c71158d

Plugin Details

Severity: High

ID: 151608

File Name: smb_nt_ms21_jul_office_web.nasl

Version: 1.5

Type: local

Agent: windows

Published: 7/13/2021

Updated: 5/9/2022

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

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

CVSS Score Source: CVE-2021-34518

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

CVSS Score Source: CVE-2021-34501

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: 7/13/2021

Vulnerability Publication Date: 7/13/2021

Reference Information

CVE: CVE-2021-34451, CVE-2021-34501, CVE-2021-34518

MSKB: 5001973, 5001986

MSFT: MS21-5001973, MS21-5001986

IAVA: 2021-A-0316-S