Advisory Details

July 12th, 2017

(Pwn2Own) Microsoft Windows NtUserLinkDpiCursor Use-After-Free Privilege Escalation Vulnerability

CVE ID	CVE-2017-8465
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 the handling of linked cursor objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privilege to the level 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-2017-8465
DISCLOSURE TIMELINE	2017-03-16 - Vulnerability reported to vendor 2017-07-12 - Coordinated public release of advisory
CREDIT	Liang Yin of Tencent PC manager team

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