Security Updates for Microsoft Sharepoint Server (July 2018)

High Nessus Plugin ID 110993

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 SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.
Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected versions of SharePoint. The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages. (CVE-2018-8300)

- 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-2018-8299, CVE-2018-8323)

Solution

Microsoft has released the following security updates to address this issue:
-KB4022243
-KB4022228
-KB4022235

See Also

http://www.nessus.org/u?b68cf0a6

http://www.nessus.org/u?ce7ad29c

http://www.nessus.org/u?f6a7940a

Plugin Details

Severity: High

ID: 110993

File Name: smb_nt_ms18_jul_office_sharepoint.nasl

Version: 1.2

Type: local

Agent: windows

Published: 2018/07/10

Modified: 2018/07/13

Dependencies: 13855, 74250, 57033

Risk Information

Risk Factor: High

CVSS Score Source: manual

CVSS Score Rationale: Nvd score unavailable. assigned cvss score for remote code execution vulnerability.

CVSSv2

Base Score: 9

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

CVSSv3

Base Score: 8.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint, cpe:/a:microsoft:project_server, cpe:/a:microsoft:office

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 2018/07/10

Vulnerability Publication Date: 2018/07/10

Reference Information

CVE: CVE-2018-8299, CVE-2018-8300, CVE-2018-8323

BID: 104610, 104611, 104614

MSKB: 4022243, 4022228, 4022235

MSFT: MS18-4022243, MS18-4022228, MS18-4022235

IAVA: 2018-A-0218