Advisory Details

July 20th, 2016

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

ZDI-16-437
ZDI-CAN-3693

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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