(Pwn2Own) Microsoft Windows UnserializePropertySet Time-Of-Check Time-Of-Use Local Privilege Escalation Vulnerability

June 12th, 2024
ZDI-24-603 ZDI-CAN-23773

CVE ID

CVE-2024-30084

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 UnserializePropertySet function in the ks.sys driver. The issue results from the lack of proper locking when performing operations on an 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-2024-30084

Disclosure Timeline

  • 2024-03-28 - Vulnerability reported to vendor
  • 2024-06-12 - Coordinated public release of advisory
  • 2024-08-15 - Advisory Updated

Credit

Angelboy (@scwuaptx) from DEVCORE Research Team

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