SB2021101210 - Multiple vulnerabilities in Microsoft SharePoint Server

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

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

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)

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)

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)

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.

5) Code Injection (CVE-ID: CVE-2021-40487)

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.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40483
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41344
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40482
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40484
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40487