Advisory Details

March 30th, 2021

Apple macOS process_token_AVCDecode Out-Of-Bounds Write Privilege Escalation Vulnerability

CVE ID	CVE-2020-27947
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 validation of user-supplied data, which can result in a write past the end of an allocated data structure. 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/HT212011
DISCLOSURE TIMELINE	2020-09-16 - Vulnerability reported to vendor 2021-03-30 - Coordinated public release of advisory
CREDIT	ABC Research s.r.o.

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