Advisory Details

August 14th, 2018

Microsoft Windows D3DKMTSubmitCommand BasicRender Driver Out-of-bounds Memory Access Privilege Escalation Vulnerability

CVE ID	CVE-2018-8401
CVSS SCORE	6.9, AV:L/AC:M/Au:N/C:C/I:C/A:C
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Windows
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on vulnerable 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 processing of data from the D3DKMTSubmitCommand API by the BasicRender device driver. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges to 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-2018-8401
DISCLOSURE TIMELINE	2018-05-03 - Vulnerability reported to vendor 2018-08-14 - Coordinated public release of advisory 2018-08-14 - Advisory Updated
CREDIT	RanchoIce and ChenNan of Tencent ZhanluLab

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