Security Update for Microsoft Office Online Server and Office Web Apps (October 2017)

high Nessus Plugin ID 103785


An application installed on the remote Windows host is affected by multiple remote code execution vulnerabilities.


A remote code execution vulnerability exists in Microsoft Office 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 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) 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.

The security update addresses the vulnerability by correcting how Office handles objects in memory.


Microsoft has released a set of patches for Microsoft Office Online Server, Office Web Apps Server 2013, Office 2010 Web Apps, and Office 2013 Web Apps.

Plugin Details

Severity: High

ID: 103785

File Name: smb_nt_ms17_oct_office_web.nasl

Version: 1.9

Type: local

Agent: windows

Published: 10/11/2017

Updated: 3/8/2022

Risk Information

CVSS Score Source: CVE-2017-11826


Risk Factor: Critical

Score: 9.6


Risk Factor: High

Base Score: 9.3

Temporal Score: 8.1

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

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


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:office_web_apps, cpe:/a:microsoft:office_online_server

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/10/2017

Vulnerability Publication Date: 10/10/2017

CISA Known Exploited Dates: 3/24/2022

Exploitable With

Core Impact

Reference Information

CVE: CVE-2017-11826

BID: 101219

MSKB: 4011231, 4011194, 3213659

MSFT: MS17-4011231, MS17-4011194, MS17-3213659

IAVA: 2017-A-0291