Security Updates for Microsoft SharePoint Server 2019 (September 2020)

high Nessus Plugin ID 140521
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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 version of SharePoint. The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages. (CVE-2020-1200, CVE-2020-1210, CVE-2020-1452, CVE-2020-1453, CVE-2020-1576)

- A tampering vulnerability exists when Microsoft SharePoint Server fails to properly handle profile data.
An attacker who successfully exploited this vulnerability could modify a targeted user's profile data. (CVE-2020-1440, CVE-2020-1523)

- A remote code execution vulnerability exists in Microsoft SharePoint where APIs aren't properly protected from unsafe data input. 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 access a susceptible API on an affected version of SharePoint with specially-formatted input. The security update addresses the vulnerability by correcting how SharePoint handles deserialization of untrusted data.
(CVE-2020-1595)

- A spoofing 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-2020-1205)

- A remote code execution vulnerability exists in Microsoft SharePoint Server when it fails to properly identify and filter unsafe ASP.Net web controls. An authenticated attacker who successfully exploited the vulnerability could use a specially crafted page to perform actions in the security context of the SharePoint application pool process. (CVE-2020-1460)

- A remote code execution vulnerability exists in Microsoft Word software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. (CVE-2020-1218, CVE-2020-1338)

- 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 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-2020-1198, CVE-2020-1227, CVE-2020-1345, CVE-2020-1482, CVE-2020-1514)

- 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. (CVE-2020-1335)

Solution

Microsoft has released security updates for Microsoft SharePoint Server.

See Also

http://www.nessus.org/u?487dc0dc

http://www.nessus.org/u?0917a96e

Plugin Details

Severity: High

ID: 140521

File Name: smb_nt_ms20_sep_office_sharepoint_2019.nasl

Version: 1.4

Type: local

Agent: windows

Published: 9/11/2020

Updated: 1/28/2021

Dependencies: microsoft_sharepoint_installed.nbin, smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

CVSS Score Source: CVE-2020-1453

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

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

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_foundation, cpe:/a:microsoft:sharepoint_server

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2020

Vulnerability Publication Date: 9/8/2020

Reference Information

CVE: CVE-2020-1198, CVE-2020-1200, CVE-2020-1205, CVE-2020-1210, CVE-2020-1218, CVE-2020-1227, CVE-2020-1335, CVE-2020-1338, CVE-2020-1345, CVE-2020-1440, CVE-2020-1452, CVE-2020-1453, CVE-2020-1460, CVE-2020-1482, CVE-2020-1514, CVE-2020-1523, CVE-2020-1576, CVE-2020-1595

MSFT: MS20-4484504, MS20-4484505

MSKB: 4484504, 4484505

IAVA: 2020-A-0412-S