Apple macOS libFontValidation loca Table Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

January 9th, 2025
ZDI-25-019 ZDI-CAN-25339

CVE ID

CVSS Score

3.3 AV:L/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. Interaction with the libFontValidation library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the parsing of loca tables. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities 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/121839

Disclosure Timeline

  • 2024-09-10 - Vulnerability reported to vendor
  • 2025-01-09 - Coordinated public release of advisory
  • 2025-01-09 - Advisory Updated

Credit

Hossein Lotfi (@hosselot) of Trend Micro Zero Day Initiative

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