PT-2021-7573 · Apple · Apple Macos

Mickey Jin + 1 · Published 2021-09-13 · Updated 2022-02-22 · CVE-2021-30832

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions macOS versions prior to Security Update 2021-005 Catalina macOS Big Sur versions prior to 11.6

Description The issue is related to a memory corruption problem, specifically a use-after-free privilege escalation vulnerability in the XPC CVMServer service of Mac OS. This vulnerability can be exploited by a local attacker to elevate their privileges. The vulnerability is caused by a buffer overflow operation.

Recommendations For macOS versions prior to Security Update 2021-005 Catalina, apply Security Update 2021-005. For macOS Big Sur versions prior to 11.6, update to macOS Big Sur 11.6. As a temporary workaround, consider restricting access to the CVMServer service until a patch is available.

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2023-00096

CVE-2021-30832

ZDI-22-355

Affected Products

Apple Macos

References · 9

• https://support.apple.com/en-us/HT212804 · Vendor Advisory
• https://support.apple.com/en-us/HT212805 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-00096 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-22-355 · Security Note
• https://osv.dev/vulnerability/CVE-2021-30832 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-30832 · Security Note
• https://support.apple.com/en-us/103147 · Note
• https://t.me/cibsecurity/30796 · Telegram Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30832 · Note