Advisory Details

November 13th, 2019

Microsoft Windows CreateXlateObject Out-Of-Bounds Write Privilege Escalation Vulnerability

ZDI-19-982
ZDI-CAN-9118

CVE ID CVE-2019-1396
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 CreateXlateObject function in win32k.sys. The issue results from the lack of proper validation of user-supplied data, which can result in a write outside the bounds of an allocated array. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of 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-2019-1396
DISCLOSURE TIMELINE
  • 2019-08-12 - Vulnerability reported to vendor
  • 2019-11-13 - Coordinated public release of advisory
CREDIT Marcin Wiazowski
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