Stack-based buffer overflow in macOS - CVE-2021-1772
Published: February 2, 2021 / Updated: June 25, 2021
Vulnerability identifier: #VU50185
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1772
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the CoreText component in macOS within the parsing of TTF fonts. A remote attacker can create a specially crafted text file, trick the victim into opening it, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
macOS
iPadOS
Apple iOS
iPadOS
Apple iOS
How to mitigate CVE-2021-1772
Install updates from vendor's website.
macOS - addressed in versions 10.14.6 18G8012, 10.15.7 19H512, 11.2 20D64
iPadOS - update to 14.4 18D52
Apple iOS - update to 14.4 18D52
iPadOS - update to 14.4 18D52
Apple iOS - update to 14.4 18D52