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K
zdiAbdelhamid Naceri (halov)ZDI-21-966
HistoryAug 11, 2021 - 12:00 a.m.

Microsoft Windows User Profile Service Directory Junction Privilege Escalation Vulnerability

2021-08-1100:00:00
Abdelhamid Naceri (halov)
www.zerodayinitiative.com
34

0.007 Low

EPSS

Percentile

80.6%

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 User Profile Service. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.