PT-2021-18872 · Apple · Ios+3

Mickey Jin + 2 · Published 2021-07-21 · Updated 2021-09-15 · CVE-2021-30789

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Apple iOS versions prior to 14.7 Apple macOS versions prior to Big Sur 11.5 Apple watchOS versions prior to 7.6 Apple tvOS versions prior to 14.7 Apple macOS Catalina versions prior to Security Update 2021-004

Description The issue is related to an out-of-bounds read that may lead to arbitrary code execution when processing a maliciously crafted font file. This is due to insufficient input validation in the CoreText TTF parsing component.

Recommendations For iOS versions prior to 14.7, update to iOS 14.7 or later. For macOS versions prior to Big Sur 11.5, update to macOS Big Sur 11.5 or later. For watchOS versions prior to 7.6, update to watchOS 7.6 or later. For tvOS versions prior to 14.7, update to tvOS 14.7 or later. For macOS Catalina versions prior to Security Update 2021-004, apply Security Update 2021-004 or later.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2021-30789

ZDI-21-961

ZDI-21-970

Affected Products

Apple Macos

Ios

Tvos

Watchos

References · 11

• https://zerodayinitiative.com/advisories/ZDI-21-970 · Security Note
• https://support.apple.com/en-us/HT212601 · Vendor Advisory
• https://support.apple.com/en-us/HT212605 · Vendor Advisory
• https://support.apple.com/en-us/HT212602 · Vendor Advisory
• https://support.apple.com/en-us/HT212600 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-21-961 · Security Note
• https://support.apple.com/en-us/HT212604 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-30789 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-30789 · Security Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30789 · Note
• https://support.apple.com/en-us/102849 · Note