SB2019121029 - Privilege escalation in Microsoft Windows AppX Deployment Server

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-1483)

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

The vulnerability exists due to an error in junctions handling within the Windows AppX Deployment Server. A local user to run a specially crafted program to escalate privileges on the system.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-1476)

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 malicious application, launch it on the system and run processes in an elevated context, then install programs; view, change or delete data.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1483
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1476