Security Update for Microsoft Office (December 2018) (macOS)

High Nessus Plugin ID 119614

Synopsis

An application installed on the remote macOS or Mac OS X host is affected by remote code execution vulnerability.

Description

The Microsoft Office application installed on the remote macOS or Mac OS X host is missing a security update. It is, therefore, affected by the following vulnerability:

- 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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file. (CVE-2018-8597)

- An information disclosure vulnerability exists when Microsoft Excel software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bound memory.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel software. (CVE-2018-8627)

- A remote code execution vulnerability exists in Microsoft PowerPoint 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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office PowerPoint software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file.
In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file. (CVE-2018-8628)

Solution

Microsoft has released a set of patches for Microsoft Office for Mac.

See Also

http://www.nessus.org/u?31ee9db7

http://www.nessus.org/u?a57f509f

http://www.nessus.org/u?25df89fa

http://www.nessus.org/u?e184b517

Plugin Details

Severity: High

ID: 119614

File Name: macos_ms18_dec_office.nasl

Version: 1.5

Type: local

Agent: macosx

Published: 2018/12/13

Updated: 2019/02/26

Dependencies: 86383

Risk Information

Risk Factor: High

CVSS Score Source: CVE-2018-8597

CVSS v2.0

Base Score: 9.3

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

CVSS v3.0

Base Score: 7.8

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

Vulnerability Information

CPE: cpe:/o:apple:mac_os_x, cpe:/a:microsoft:office, cpe:/a:microsoft:excel_for_mac, cpe:/a:microsoft:excel, cpe:/a:microsoft:powerpoint, cpe:/a:microsoft:outlook, cpe:/a:microsoft:onenote

Required KB Items: Host/MacOSX/Version

Patch Publication Date: 2018/12/11

Vulnerability Publication Date: 2018/12/11

Reference Information

CVE: CVE-2018-8597, CVE-2018-8627, CVE-2018-8628

BID: 106100, 106120, 106104