Security Updates for Microsoft SharePoint Server (September 2018)

Critical Nessus Plugin ID 117425

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 :

- 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-2018-8428,
CVE-2018-8431)

- A cross-site-scripting (XSS) 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. The attacks could allow the attacker to read
content that the attacker is not authorized to read, use
the victims 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-2018-8426)

Solution

Microsoft has released the following security updates to address this issue:
-KB4092459
-KB4092470
-KB4022207

See Also

http://www.nessus.org/u?b788a1ee

http://www.nessus.org/u?5999379b

http://www.nessus.org/u?94c0437b

Plugin Details

Severity: Critical

ID: 117425

File Name: smb_nt_ms18_sep_office_sharepoint.nasl

Version: 1.4

Type: local

Agent: windows

Published: 2018/09/11

Modified: 2018/10/11

Dependencies: 93232, 74250, 57033, 13855

Risk Information

Risk Factor: Critical

CVSS Score Source: manual

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

CVSS v2.0

Base Score: 10

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

CVSS v3.0

Base Score: 9.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint

Patch Publication Date: 2018/09/11

Vulnerability Publication Date: 2018/09/11

Reference Information

CVE: CVE-2018-8426, CVE-2018-8428, CVE-2018-8431

MSKB: 4092459, 4092470, 4022207

MSFT: MS18-4092459, MS18-4092470, MS18-4022207