Advisory Details

August 18th, 2022

(Pwn2Own) Microsoft Windows bthport Driver Improper Authorization Local Privilege Escalation Vulnerability

ZDI-22-1068
ZDI-CAN-17430

CVE ID CVE-2022-35820
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 bthport.sys driver. The issue results from improper authorization logic when accessing registry keys. 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-2022-35820
DISCLOSURE TIMELINE
  • 2022-05-25 - Vulnerability reported to vendor
  • 2022-08-18 - Coordinated public release of advisory
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