Attacker Value
High
(1 user assessed)
Exploitability
Low
(1 user assessed)
User Interaction
Unknown
Privileges Required
Unknown
Attack Vector
Unknown
0

CVE-2019-0841: AppXSvc Hard Link Privilege Escalation

Disclosure Date: April 09, 2019 Last updated February 13, 2020
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Description

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could then install programs; view, change or delete data.

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2
Ratings
  • Attacker Value
    High
  • Exploitability
    Low
Technical Analysis

This vulnerability allows for taking over SYSTEM-owned files. Getting an elevated shell takes more effort, either by exposing the DiagHub service, which will willingly load a file from System32 with SYSTEM privileges or by combing the target for a service that loads a dll as SYSTEM. Exploitability is variable due to those reasons, but ultimately this is a useful vulnerability. Effort to execute this exploit is rated higher due to shell access being a prerequisite.

There is even a bypass for this vulnerability’s patch: CVE-2019-1064.

General Information

Additional Info

Technical Analysis