Out-of-bounds read in macOS - CVE-2021-30789
Published: July 22, 2021
Vulnerability identifier: #VU55196
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-2021-30789
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to a boundary condition within the CoreText component. A remote attacker can create a specially crafted font file, trick the victim into opening it, trigger out-of-bounds read error and execute arbitrary code on the system.
Affected software
macOS
watchOS
tvOS
iPadOS
Apple iOS
watchOS
tvOS
iPadOS
Apple iOS
How to mitigate CVE-2021-30789
Install updates from vendor's website.
macOS - addressed in versions 11.5 20G71, 10.15.7 19H1323
watchOS - update to 7.6 18U63
tvOS - update to 14.7 18M60
iPadOS - addressed in versions 14.7 18G69, 14.7 18G70
Apple iOS - update to 14.7 18G69
watchOS - update to 7.6 18U63
tvOS - update to 14.7 18M60
iPadOS - addressed in versions 14.7 18G69, 14.7 18G70
Apple iOS - update to 14.7 18G69