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K
zdiMarcin WiazowskiZDI-21-287
HistoryMar 15, 2021 - 12:00 a.m.

Microsoft Windows win32kfull bStretch NULL Pointer Dereference Privilege Escalation Vulnerability

2021-03-1500:00:00
Marcin Wiazowski
www.zerodayinitiative.com
25
microsoft windows
win32kfull
bstretch
null pointer dereference
privilege escalation
vulnerability
local attackers
low-privileged code
win32kfull.sys driver
dereferencing
arbitrary code
context of system

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 dereferencing a NULL pointer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.