Security Updates for Microsoft SharePoint Server (October 2018)

High Nessus Plugin ID 118011

Synopsis

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

Description

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

- A remote code execution vulnerability exists in
Microsoft Word software when the software fails to
properly handle objects in Protected View. 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-2018-8504)

- An elevation of privilege vulnerability exists when
Microsoft SharePoint Server does not properly sanitize a
specially crafted web request to an affected SharePoint
server. An authenticated attacker could exploit the
vulnerability by sending a specially crafted request to
an affected SharePoint server. The attacker who
successfully exploited the vulnerability could then
perform cross-site scripting attacks on affected systems
and run script in the security context of the current
user. These attacks could allow the attacker to read
content that the attacker is not authorized to read, use
the victim's identity to take actions on the SharePoint
site on behalf of the user, such as change permissions
and delete content, and inject malicious content in the
browser of the user. The security update addresses the
vulnerability by helping to ensure that SharePoint
Server properly sanitizes web requests. (CVE-2018-8480,
CVE-2018-8488, CVE-2018-8498, CVE-2018-8518)

Solution

Microsoft has released the following security updates to address this issue:
-KB4092481
-KB4461447
-KB4461450

See Also

http://www.nessus.org/u?c4894af8

http://www.nessus.org/u?bd549024

http://www.nessus.org/u?9d014a4d

Plugin Details

Severity: High

ID: 118011

File Name: smb_nt_ms18_oct_office_sharepoint.nasl

Version: 1.3

Type: local

Agent: windows

Published: 2018/10/09

Modified: 2018/11/15

Dependencies: 57033, 93232, 13855, 74250

Risk Information

Risk Factor: High

CVSS Score Source: manual

CVSS Score Rationale: Score based on analysis of the vendor advisory.

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: 8.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint

Patch Publication Date: 2018/10/09

Vulnerability Publication Date: 2018/10/09

Reference Information

CVE: CVE-2018-8480, CVE-2018-8488, CVE-2018-8498, CVE-2018-8504, CVE-2018-8518

MSKB: 4461450, 4092481, 4461447

MSFT: MS18-4461450, MS18-4092481, MS18-4461447