SB2021030942 - Multiple vulnerabilities in Microsoft Office

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Code Injection (CVE-ID: CVE-2021-27057)

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

The vulnerability exists due to improper input validation within the Graph COM object in Microsoft Office. A remote 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.

2) Code Injection (CVE-ID: CVE-2021-24108)

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

The vulnerability exists due to improper input validation in Microsoft Office. A remote 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) Code Injection (CVE-ID: CVE-2021-27059)

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

The vulnerability exists due to improper input validation in Microsoft Office. A remote administrator 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.

Note, the vulnerability is being actively exploited in the wild.

4) Code Injection (CVE-ID: CVE-2021-27058)

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

The vulnerability exists due to improper input validation in Microsoft Office ClickToRun. A remote 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-2021-27057
• https://www.zerodayinitiative.com/advisories/ZDI-21-334/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24108
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27059
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27058