Intrusion Prevention

MS.RPC.AppXSvc.Privilege.Escalation

Description

This indicates an attack attempt to exploit an Elevation of Privilege vulnerability in Microsoft Windows Appx Deployment Service (AppxSVc).
The vulnerability is due to the lack of user impersonation when the service attempts to create arbitrary files through symbolic link. Any unprivileged user is allowed to escalate their privilege upon successful exploitation.

Affected Products

Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1703 for 32-bit Systems
Windows 10 Version 1703 for x64-based Systems
Windows 10 Version 1709 for 32-bit Systems
Windows 10 Version 1709 for 64-based Systems
Windows 10 Version 1709 for ARM64-based Systems
Windows 10 Version 1803 for 32-bit Systems
Windows 10 Version 1803 for ARM64-based Systems
Windows 10 Version 1803 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server, version 1709 (Server Core Installation)
Windows Server, version 1803 (Server Core Installation)

Impact

Privilege Escalation: Remote attackers can leverage their privileges on vulnerable systems.

Recommended Actions

Apply the most recent upgrade or patch from the vendor.
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2019-0766

CVE References

CVE-2019-0766

Other References

2019-0766