Advisory Details

May 30th, 2019

Apple macOS IOAccelSharedUserClient2 Untrusted Pointer Dereference Privilege Escalation Vulnerability

ZDI-19-538
ZDI-CAN-8356

CVE ID CVE-2019-8616
CVSS SCORE 7.8, (AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Apple macOS. 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 IOAccelSharedUserClient2 call. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this vulnerability to escalate privileges and execute code in 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/HT210119
DISCLOSURE TIMELINE
  • 2019-04-03 - Vulnerability reported to vendor
  • 2019-05-30 - Coordinated public release of advisory
CREDIT Lilang Wu and Moony Li of TrendMicro Mobile Security Research Team
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