Advisory Details

May 20th, 2021

Apple macOS QuartzCore Type Confusion Privilege Escalation Vulnerability

ZDI-21-597
ZDI-CAN-12157

CVE ID CVE-2021-30745
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 QuartzCore Framework. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of WindowServer.
ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/HT212326
DISCLOSURE TIMELINE
  • 2020-12-18 - Vulnerability reported to vendor
  • 2021-05-20 - Coordinated public release of advisory
  • 2021-05-20 - Advisory Updated
CREDIT Peter Nguyen of STAR Labs
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