Advisory Details

September 21st, 2020

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

CVE ID	CVE-2020-9921
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-gb/HT211289
DISCLOSURE TIMELINE	2020-05-19 - Vulnerability reported to vendor 2020-09-21 - Coordinated public release of advisory
CREDIT	ABC Research s.r.o.

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