Microsoft Windows AppX Deployment Service Hard Link Escalation of Privilege Vulnerability

2019-12-11T00:00:00
ID ZDI-19-1005
Type zdi
Reporter Jeong Oh Kyea(@kkokkokye) of THEORI
Modified 2019-06-22T00:00:00

Description

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AppX Deployment Service. By creating a hard link, an attacker can abuse the service to overwrite the contents of a chosen file. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of SYSTEM.