SB2021020930 - Multiple vulnerabilities in Microsoft SharePoint

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2021-24071)

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

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

2) Input validation error (CVE-ID: CVE-2021-24066)

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

The vulnerability exists due to insufficient validation of user-supplied input in Microsoft SharePoint. A remote authenticated attacker can create a site using specific code and execute arbitrary code on the target system.

3) Spoofing attack (CVE-ID: CVE-2021-1726)

The vulnerability allows a remote attacker to perform spoofing attack.

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

4) Input validation error (CVE-ID: CVE-2021-24072)

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

The vulnerability exists due to insufficient validation of user-supplied input in Microsoft SharePoint Server. A remote authenticated attacker can pass specially crafted input to the application and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24071
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24066
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1726
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24072