Advisory Details

September 15th, 2017

Microsoft Windows PlgBlt Out-Of-Bounds Read Information Disclosure Vulnerability

CVE ID	CVE-2017-8720
CVSS SCORE	1.2, AV:L/AC:H/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 vPlgWrite1 in the win32kfull driver. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code under 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-2017-8720
DISCLOSURE TIMELINE	2017-08-04 - Vulnerability reported to vendor 2017-09-15 - Coordinated public release of advisory
CREDIT	Jaanus Kp Clarified Security

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