Advisory Details

September 10th, 2019

Apple macOS AMDRadeonX4000 Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-19-819
ZDI-CAN-9066

CVE ID CVE-2019-8692
CVSS SCORE 5.6, AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose sensitive information 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 fillUBMSurfaceInfoInternal function in AMDRadeonX4000.kext. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities 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/HT210348
DISCLOSURE TIMELINE
  • 2019-07-25 - Vulnerability reported to vendor
  • 2019-09-10 - Coordinated public release of advisory
CREDIT Lilang Wu and Moony Li of TrendMicro Mobile Security Research Team
BACK TO ADVISORIES