Advisory Details

May 12th, 2020

(Pwn2Own) Microsoft Windows DirectComposition SetReferenceArrayProperty Use-After-Free Privilege Escalation Vulnerability

ZDI-20-646
ZDI-CAN-10785

CVE ID CVE-2020-1135
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 handling of the DirectComposition SetReferenceArrayProperty function in the kernel. 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 code in the context of the kernel.

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-2020-1135
DISCLOSURE TIMELINE
  • 2020-04-28 - Vulnerability reported to vendor
  • 2020-05-12 - Coordinated public release of advisory
CREDIT fluoroacetate
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