SB2019071017 - Privilege escalation in AppX Deployment Service in Microsoft Windows

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-1129)

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

The vulnerability exists due to the way Windows AppX Deployment Service (AppXSVC) handles hard links. A local user can create a hard link to a critical file on the system and gain full control over that file.

Successful exploitation of the vulnerability may allow an attacker to gain elevated privileges.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-1130)

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

The vulnerability exists due to the way Windows AppX Deployment Service (AppXSVC) handles hard links. A local user can create a hard link to a critical file on the system and gain full control over that file.

Successful exploitation of the vulnerability may allow an attacker to gain elevated privileges.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1129
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1130