Advisory Details

November 6th, 2019

Apple macOS AMDRadeonX4000_AMDSIGLContext Untrusted Pointer Dereference Privilege Escalation Vulnerability

CVE ID	CVE-2019-8748
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 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 the AMDRadeonX4000_AMDSIGLContext object. 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/HT210634
DISCLOSURE TIMELINE	2019-06-21 - Vulnerability reported to vendor 2019-11-06 - Coordinated public release of advisory
CREDIT	Lilang Wu and Moony Li of TrendMicro Mobile Security Research Team

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