Security Updates for Microsoft SharePoint Server (May 2020)

high Nessus Plugin ID 136514

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 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-2020-1099, CVE-2020-1100, CVE-2020-1101, CVE-2020-1106)

- An information disclosure vulnerability exists where certain modes of the search function in Microsoft SharePoint Server are vulnerable to cross-site search attacks (a variant of cross-site request forgery, CSRF).
When users are simultaneously logged in to Microsoft SharePoint Server and visit a malicious web page, the attacker can, through standard browser functionality, induce the browser to invoke search queries as the logged in user. While the attacker cant access the search results or documents as such, the attacker can determine whether the query did return results or not, and thus by issuing targeted queries discover facts about documents that are searchable for the logged-in user. The security update addresses the vulnerability by running the search queries in a way that doesnt expose them to this browser vulnerability. (CVE-2020-1103)

- 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-2020-1023, CVE-2020-1024, CVE-2020-1102)

- 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-2020-1104, CVE-2020-1105, CVE-2020-1107)

- 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-2020-1069)

Solution

Microsoft has released the following security updates to address this issue:
-KB4484336
-KB4484332
-KB4484352
-KB4484364
-KB4484383

See Also

http://www.nessus.org/u?16c795ce

http://www.nessus.org/u?8fc997cf

http://www.nessus.org/u?753e4507

http://www.nessus.org/u?9389843a

http://www.nessus.org/u?381e7ad4

Plugin Details

Severity: High

ID: 136514

File Name: smb_nt_ms20_may_office_sharepoint.nasl

Version: 1.6

Type: local

Agent: windows

Published: 5/12/2020

Updated: 1/28/2021

Risk Information

CVSS Score Source: CVE-2020-1102

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

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

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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: 5/12/2020

Vulnerability Publication Date: 5/12/2020

Reference Information

CVE: CVE-2020-1023, CVE-2020-1024, CVE-2020-1069, CVE-2020-1099, CVE-2020-1100, CVE-2020-1101, CVE-2020-1102, CVE-2020-1103, CVE-2020-1104, CVE-2020-1105, CVE-2020-1106, CVE-2020-1107

MSKB: 4484336, 4484364, 4484383, 4484352, 4484332

MSFT: MS20-4484336, MS20-4484364, MS20-4484383, MS20-4484352, MS20-4484332

IAVA: 2020-A-0215-S