PT-2021-13641 · Apple · Apple Macos+4

Hjy79425575 + 3 · Published 2021-04-26 · Updated 2021-09-17 · CVE-2021-1881

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: macOS versions prior to 11.3 iOS versions prior to 14.5 iPadOS versions prior to 14.5 watchOS versions prior to 7.4 tvOS versions prior to 14.5

Description: An out-of-bounds read issue was addressed with improved input validation. Processing a maliciously crafted font file may lead to arbitrary code execution.

Recommendations: For macOS versions prior to 11.3, update to macOS Big Sur 11.3 or later. For iOS versions prior to 14.5, update to iOS 14.5 or later. For iPadOS versions prior to 14.5, update to iPadOS 14.5 or later. For watchOS versions prior to 7.4, update to watchOS 7.4 or later. For tvOS versions prior to 14.5, update to tvOS 14.5 or later. As a temporary workaround, consider avoiding the use of maliciously crafted font files until a patch is available.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2021-1881

ZDI-21-600

Affected Products

Apple Macos

Ios

Ipados

Tvos

Watchos

References · 13

• https://support.apple.com/en-us/HT212317 · Vendor Advisory
• https://support.apple.com/en-us/HT212326 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-21-600 · Security Note
• https://support.apple.com/en-us/HT212325 · Vendor Advisory
• https://support.apple.com/en-us/HT212327 · Vendor Advisory
• https://support.apple.com/en-us/HT212323 · Vendor Advisory
• https://support.apple.com/en-us/HT212324 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-1881 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-1881 · Security Note
• https://t.me/cibsecurity/28449 · Telegram Post
• https://support.apple.com/en-us/103126 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1881 · Note
• https://t.me/cvenotify/21110 · Telegram Post