Advisory Details

January 21st, 2021

Microsoft Windows splwow64 Out-Of-Bounds Read Privilege Escalation Vulnerability

CVE ID	CVE-2021-1648
CVSS SCORE	7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Windows
VULNERABILITY DETAILS	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 read past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges from low integrity and execute arbitrary code in the context of the current user at medium integrity.
ADDITIONAL DETAILS	Microsoft has issued an update to correct this vulnerability. More details can be found at: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1648
DISCLOSURE TIMELINE	2021-01-05 - Vulnerability reported to vendor 2021-01-21 - Coordinated public release of advisory
CREDIT	Elliot Cao (@iamelli0t) working with Trend Micro's Zero Day Initiative

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