Microsoft Windows dxgkrnl Driver D3DKMTRender Method Untrusted Pointer Dereference Privilege Escalation Vulnerability

August 14th, 2018
ZDI-18-950 ZDI-CAN-6120

CVE ID

CVE-2018-8400

CVSS Score

6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected Vendors

Microsoft

Affected Products

Windows

Vulnerability Details


This vulnerability allows remote attackers to escalate privileges on vulnerable 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 D3DKMTRender routine in the dxgkrnl driver. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this vulnerability to escalate privileges to SYSTEM.

Additional Details

Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8400

Disclosure Timeline

  • 2018-05-03 - Vulnerability reported to vendor
  • 2018-08-14 - Coordinated public release of advisory
  • 2018-08-14 - Advisory Updated

Credit

RanchoIce and ChenNan of Tencent ZhanluLab

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