Advisory Details

February 16th, 2022

Apple macOS CVMServer Use-After-Free Privilege Escalation Vulnerability

ZDI-22-355
ZDI-CAN-14040

CVE ID CVE-2021-30832
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/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 CVMServer daemon. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/HT212804
DISCLOSURE TIMELINE
  • 2021-06-04 - Vulnerability reported to vendor
  • 2022-02-16 - Coordinated public release of advisory
CREDIT Mickey Jin (@patch1t) of Trend Micro
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