Advisory Details

December 28th, 2022

Microsoft Windows GreDrawStream Use-After-Free Local Privilege Escalation Vulnerability

CVE ID	CVE-2022-44671
CVSS SCORE	8.8, AV:L/AC:L/PR:L/UI:N/S:C/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 GreDrawStream function. Crafted data passed to this function can cause a pointer to be reused after it has been freed. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
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-2022-44671
DISCLOSURE TIMELINE	2022-09-08 - Vulnerability reported to vendor 2022-12-28 - Coordinated public release of advisory
CREDIT	Marcin Wiazowski

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