Advisory Details

September 12th, 2023

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

ZDI-23-1407
ZDI-CAN-21008

CVE ID CVE-2023-36804
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 win32kfull driver. The issue results from the lack of validating the existence of an object prior to performing operations on the object. 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-2023-36804
DISCLOSURE TIMELINE
  • 2023-06-07 - Vulnerability reported to vendor
  • 2023-09-12 - Coordinated public release of advisory
CREDIT Marcin Wiazowski
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