SB2020031023 - Multiple vulnerabilities in Microsoft Win32k

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2020-0788)

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

The vulnerability exists due to a boundary error when processing objects in memory within the Win32k component. A local user can create a malicious application, launch it on the system and execute arbitrary code with SYSTEM privileges.

2) Buffer overflow (CVE-ID: CVE-2020-0887)

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

The vulnerability exists due to a boundary error when processing objects in memory within the Win32k component. A local user can create a malicious application, launch it on the system and execute arbitrary code with SYSTEM privileges.

3) Buffer overflow (CVE-ID: CVE-2020-0877)

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

The vulnerability exists due to a boundary error when processing objects in memory within the Win32k component. A local user can create a malicious application, launch it on the system and execute arbitrary code with SYSTEM privileges.

4) Out-of-bounds read (CVE-ID: CVE-2020-0876)

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the win32k component. A local user can use a specially crafted application to trigger out-of-bounds read error and read contents of memory on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0788
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0887
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0877
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0876