Advisory Details

November 11th, 2020

Microsoft Windows bindflt Driver Missing Authentication Privilege Escalation Vulnerability

ZDI-20-1365
ZDI-CAN-11361

CVE ID CVE-2020-17012
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 bindflt.sys driver. A crafted request with an IOCTL of 0x220000 can perform remapping of directories. 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-2020-17012
DISCLOSURE TIMELINE
  • 2020-08-05 - Vulnerability reported to vendor
  • 2020-11-11 - Coordinated public release of advisory
CREDIT whoami
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