SB2021091417 - Multiple vulnerabilities in Microsoft Windows Ancillary Function Driver for WinSock

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-38638)

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 Windows Ancillary Function Driver for WinSock, which leads to security restrictions bypass and privilege escalation.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-38628)

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 Windows Ancillary Function Driver for WinSock, which leads to security restrictions bypass and privilege escalation.

3) Information disclosure (CVE-ID: CVE-2021-38629)

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 Windows Ancillary Function Driver for WinSock. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38638
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38628
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38629