Advisory Details

December 9th, 2020

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

CVE ID	CVE-2020-27907
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 kext. 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	This issue was addressed in macOS Big Sur 11.0.1 and iOS 14.
DISCLOSURE TIMELINE	2020-07-15 - Vulnerability reported to vendor 2020-12-09 - Coordinated public release of advisory
CREDIT	ABC Research s.r.o.

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