SB2021051110 - Multiple vulnerabilities in Microsoft Office

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Code Injection (CVE-ID: CVE-2021-31175)

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

The vulnerability exists due to improper input validation in the Microsoft Office. A remote attacker can trick a victim to open a specially crafted file 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-2021-31179)

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

The vulnerability exists due to improper input validation in the Microsoft Office. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the target system.

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

3) Out-of-bounds read (CVE-ID: CVE-2021-31178)

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

The vulnerability exists due to a boundary condition in the Microsoft Office. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

4) Code Injection (CVE-ID: CVE-2021-31177)

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

The vulnerability exists due to improper input validation in the Microsoft Office. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the target system.

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

5) Code Injection (CVE-ID: CVE-2021-31176)

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

The vulnerability exists due to improper input validation in the Microsoft Office. A remote attacker can trick a victim to open a specially crafted file 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-2021-31175
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31179
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31178
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31177
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31176