Advisory Details

July 11th, 2017

(Pwn2Own) Microsoft Windows CLFS Driver Uninitialized Memory Privilege Escalation Vulnerability

CVE ID	CVE-2017-8590
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 Common Log File System (CLFS) driver. A crafted call to this driver can trigger access to memory prior to initialization. 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-2017-8590
DISCLOSURE TIMELINE	2017-03-16 - Vulnerability reported to vendor 2017-07-11 - Coordinated public release of advisory
CREDIT	pgboy and zhong_sf of Qihoo 360Vulcan Team

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