Advisory Details

October 19th, 2020

Apple macOS process_token_SetFence Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

ZDI-20-1260
ZDI-CAN-10924

CVE ID CVE-2020-9990
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 AppleIntelKBLGraphics kernel extension. The issue results from the lack of proper locking when performing operations on an object. 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/HT211289
DISCLOSURE TIMELINE
  • 2020-05-19 - Vulnerability reported to vendor
  • 2020-10-19 - Coordinated public release of advisory
CREDIT ABC Research s.r.l.
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