Advisory Details

February 16th, 2022

Apple macOS libFontParser TTF Font Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

CVE ID	CVE-2021-30771
CVSS SCORE	7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	macOS
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple macOS. Interaction with the libFontParser library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the parsing of TTF fonts. Crafted data in a TTF font can trigger a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process.
ADDITIONAL DETAILS	Apple has issued an update to correct this vulnerability. More details can be found at: https://support.apple.com/en-us/HT212529
DISCLOSURE TIMELINE	2021-05-12 - Vulnerability reported to vendor 2022-02-16 - Coordinated public release of advisory
CREDIT	Mickey Jin (@patch1t) of Trend Micro

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