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K
zdiMarcin WiazowskiZDI-21-494
HistoryApr 29, 2021 - 12:00 a.m.

Microsoft Windows win32kfull MulStrokeAndFillPath Untrusted Pointer Dereference Privilege Escalation Vulnerability

2021-04-2900:00:00
Marcin Wiazowski
www.zerodayinitiative.com
35
microsoft windows
win32kfull.sys
untrusted pointer dereference
privilege escalation

EPSS

0.001

Percentile

28.3%

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 win32kfull.sys driver. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.