Advisory Details

November 11th, 2020

Microsoft Windows DirectComposition Uninitialized Pointer Privilege Escalation Vulnerability

ZDI-20-1371
ZDI-CAN-11867

CVE ID CVE-2020-17057
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 implementation of DirectComposition in the Windows kernel. Crafted parameters to a system call can trigger access to a pointer prior to initialization. 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-2020-17057
DISCLOSURE TIMELINE
  • 2020-09-18 - Vulnerability reported to vendor
  • 2020-11-11 - Coordinated public release of advisory
CREDIT Anonymous
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