SB2021101210 - Multiple vulnerabilities in Microsoft SharePoint Server

Security Bulletin ID SB2021101210

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 5

Exploitation vector Remote access

Highest impact Code execution

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 5 vulnerabilities.

1) Spoofing attack (CVE-ID: CVE-2021-40483)

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in Microsoft SharePoint Server. A remote authenticated attacker can spoof page content.

2) Code Injection (CVE-ID: CVE-2021-41344)

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in Microsoft SharePoint Server. A remote authenticated attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

3) Information disclosure (CVE-ID: CVE-2021-40482)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in Microsoft SharePoint Server. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

4) Spoofing attack (CVE-ID: CVE-2021-40484)