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zdiLucas Leong (@_wmliang_) of Trend Micro's Zero Day InitiativeZDI-20-1432
HistoryDec 15, 2020 - 12:00 a.m.

(0Day) Microsoft Windows splwow64 Out-Of-Bounds Write Privilege Escalation Vulnerability

Lucas Leong (@_wmliang_) of Trend Micro's Zero Day Initiative

0.001 Low




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-mode printer driver host process splwow64.exe. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges from low integrity and execute code in the context of the current user at medium integrity.