Advisory Details

December 8th, 2020

Apple macOS Kernel Command 0x10007 Out-Of-Bounds Write Privilege Escalation Vulnerability

ZDI-20-1403
ZDI-CAN-11209

CVE ID CVE-2020-27897
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

This issue was addressed in macOS Big Sur 11.0.1.


DISCLOSURE TIMELINE
  • 2020-07-29 - Vulnerability reported to vendor
  • 2020-12-08 - Coordinated public release of advisory
CREDIT ABC Research s.r.o.
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