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zdiAbdelhamid NaceriZDI-21-1075
HistorySep 16, 2021 - 12:00 a.m.

Microsoft Windows Update Agent Directory Junction Privilege Escalation Vulnerability

2021-09-1600:00:00
Abdelhamid Naceri
www.zerodayinitiative.com
28

0.0004 Low

EPSS

Percentile

9.8%

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 Windows Update Agent. By creating a directory junction, an attacker can abuse Windows Update Agent to delete a file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.