Advisory Details

December 15th, 2016

Apple OS X WindowServer _XRegisterCursorWithData Memory Corruption Privilege Escalation Vulnerability

CVE ID	CVE-2016-4640
CVSS SCORE	4.4, AV:L/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	OS X
VULNERABILITY DETAILS	This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of Apple OS X. 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 CoreGraphics module. The issue lies in the failure to properly validate user-supplied data which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges under the context of WindowServer.
ADDITIONAL DETAILS	Apple has issued an update to correct this vulnerability. More details can be found at: https://support.apple.com/en-us/HT206903
DISCLOSURE TIMELINE	2016-06-14 - Vulnerability reported to vendor 2016-12-15 - Coordinated public release of advisory
CREDIT	aca055c25829115b84ad07e72a4eff16

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