Advisory Details

May 20th, 2021

Apple macOS AppleIntelKBLGraphics IOCTL 0x30005 Out-Of-Bounds Write Privilege Escalation Vulnerability

CVE ID	CVE-2021-1834
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 handling of IOCTL 0x30005 in 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 arbitrary 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/HT212325
DISCLOSURE TIMELINE	2020-12-18 - Vulnerability reported to vendor 2021-05-20 - Coordinated public release of advisory 2021-05-20 - Advisory Updated
CREDIT	ABC Research s.r.o.

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