Advisory Details

June 11th, 2019

(Pwn2Own) Microsoft Windows DirectComposition PropertySet Out-Of-Bounds Write Privilege Escalation Vulnerability

ZDI-19-560
ZDI-CAN-8369

CVE ID CVE-2019-1041
CVSS SCORE 7.8, (AV:L/AC:L/PR:L/UI:N/S:U/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 DirectComposition PropertySet objects in the kernel. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. 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-2019-1041
DISCLOSURE TIMELINE
  • 2019-03-21 - Vulnerability reported to vendor
  • 2019-06-11 - Coordinated public release of advisory
  • 2019-06-14 - Advisory Updated
CREDIT fluoroacetate (@fluoroacetate)
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