High
CVE-2019-0841: AppXSvc Hard Link Privilege Escalation
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Description
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Type
High
(1 user assessed)
Low
(1 user assessed)Unknown
Unknown
Unknown
CVE-2019-0841: AppXSvc Hard Link Privilege Escalation
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
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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Ratings
-
Attacker ValueHigh
-
ExploitabilityLow
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.
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Technical Analysis
Report as Exploited in the Wild
What do we mean by "exploited in the wild"?
By selecting this, you are verifying to the AttackerKB community that either you, or a reputable source (example: a security vendor or researcher), has observed an active attempt by attackers, or IOCs related, to exploit this vulnerability outside of a research environment.
A vulnerability should also be considered "exploited in the wild" if there is a publicly available PoC or exploit (example: in an exploitation framework like Metasploit).
