Advisory Details

November 13th, 2019

Microsoft Windows splwow64 Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

ZDI-19-987
ZDI-CAN-9393

CVE ID CVE-2019-1380
CVSS SCORE 7.0, (AV:L/AC:H/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 user-mode printer driver host process splwow64.exe. The code is subject to a time-of-check/time-of-use race condition when handling a call from a client. An attacker can leverage this vulnerability to escalate privileges from low integrity and execute code in the context of the current user at medium integrity.

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-2019-1380
DISCLOSURE TIMELINE
  • 2019-10-29 - Vulnerability reported to vendor
  • 2019-11-13 - Coordinated public release of advisory
CREDIT Anonymous
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