Advisory Details

June 7th, 2019

Apple macOS AMDRadeonX4000_AMDSIGLContext Double Free Privilege Escalation Vulnerability

ZDI-19-543
ZDI-CAN-8345

CVE ID CVE-2019-8635
CVSS SCORE 7.0, (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS

This vulnerability allows local attackers to execute arbitrary code on affected 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 processing of sideband tokens in the AMDRadeonX4000_AMDSIGLContext class. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges to the level 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
  • 2019-03-14 - Vulnerability reported to vendor
  • 2019-06-07 - Coordinated public release of advisory
CREDIT Lilang Wu and Moony Li of TrendMicro Mobile Security Research Team
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