Advisory Details

May 20th, 2021

Apple macOS libFontParser OTF Font Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

CVE ID	CVE-2021-1881
CVSS SCORE	4.3, AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	macOS
VULNERABILITY DETAILS	This vulnerability allows remote attackers to disclose sensitive information on affected installations of Apple macOS. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the GetFDIndex function in libFontParser. Crafted data in an OTF font can trigger a read past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary 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/HT212325
DISCLOSURE TIMELINE	2021-01-08 - Vulnerability reported to vendor 2021-05-20 - Coordinated public release of advisory 2021-05-20 - Advisory Updated
CREDIT	Mickey Jin of Trend Micro Mobile Security Research Team

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