Advisory Details

July 11th, 2017

(Pwn2Own) Microsoft Windows win32kfull CopyOutputString Out-Of-Bounds Read Information Disclosure Vulnerability

CVE ID	CVE-2017-8486
CVSS SCORE	2.1, AV:L/AC:L/Au:N/C:P/I:N/A:N
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 win32kfull!CopyOutputString function. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities 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-2017-8486
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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