Advisory Details

November 20th, 2017

Microsoft Windows EngLockSurface Time-Of-Check Time-Of-Use Race Condition Information Disclosure Vulnerability

CVE ID	CVE-2017-11851
CVSS SCORE	5.4, AV:L/AC:M/Au:N/C:P/I:N/A:C
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Windows
VULNERABILITY DETAILS	This vulnerability allows local attackers to disclose sensitive information 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 implementation of the EngLockSurface API. Performing a memory write at an unexpected time during the execution of EngLockSurface can cause the kernel to read from an improper address. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context 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-2017-11851
DISCLOSURE TIMELINE	2017-09-01 - Vulnerability reported to vendor 2017-11-20 - Coordinated public release of advisory
CREDIT	Marcin Wiazowski

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