Advisory Details

July 11th, 2017

(Pwn2Own) Microsoft Windows PlgBlt Integer Overflow Privilege Escalation Vulnerability

CVE ID	CVE-2017-8578
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 implementation of PlgBlt, an operation that writes bitmap graphics to parallelogram-shaped destination areas. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before writing to memory. 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-2017-8578
DISCLOSURE TIMELINE	2017-03-16 - Vulnerability reported to vendor 2017-07-11 - Coordinated public release of advisory
CREDIT	Tencent Security - Team Sniper (Keen Lab and PC Mgr)

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