SB2021071351 - Multiple vulnerabilities in Microsoft Windows Kernel

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Code Injection (CVE-ID: CVE-2021-34458)

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

The vulnerability exists due to improper input validation in the Windows Kernel within the single root input/output virtualization (SR-IOV) device and Peripheral Component Interface Express (PCIe). 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.

2) Information disclosure (CVE-ID: CVE-2021-34500)

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 the Windows Kernel Hyper-V host server. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-34514)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in the Windows Kernel, which leads to security restrictions bypass and privilege escalation.

4) Code Injection (CVE-ID: CVE-2021-34508)

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

The vulnerability exists due to improper input validation in the Windows Kernel. 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-2021-34458
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34500
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34514
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34508