Advisory Details

July 20th, 2016

Apple OS X DspFuncLib Use-After-Free Privilege Escalation Vulnerability

CVE ID	CVE-2016-4647
CVSS SCORE	6.9, AV:L/AC:M/Au:N/C:C/I:C/A:C
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. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of DspFuncLib. The issue lies in the failure to properly check function IDs before removing items from a function table. An attacker can leverage this vulnerability to escalate privileges and execute code under the context of the kernel.
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	2016-04-12 - Vulnerability reported to vendor 2016-07-20 - Coordinated public release of advisory
CREDIT	Juwei Lin of Trend Micro

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