Advisory Details

November 20th, 2017

Microsoft Windows win32k Menu Use-After-Free Privilege Escalation Vulnerability

CVE ID	CVE-2017-11847
CVSS SCORE	7.2, AV:L/AC:L/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 menus in the win32k driver. 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 privileges 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-2017-11847
DISCLOSURE TIMELINE	2017-08-22 - Vulnerability reported to vendor 2017-11-20 - Coordinated public release of advisory
CREDIT	nyaacate of Viettel Cyber Security

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