Advisory Details

July 24th, 2019

Apple Safari CSSFontFace Use-After-Free Remote Code Execution Vulnerability

ZDI-19-681
ZDI-CAN-8627

CVE ID CVE-2019-8644
CVSS SCORE 5.0, AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
AFFECTED VENDORS Apple
AFFECTED PRODUCTS Safari
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple Safari. 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 handling of CSSFontFace objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. 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/HT210348
DISCLOSURE TIMELINE
  • 2019-05-02 - Vulnerability reported to vendor
  • 2019-07-24 - Coordinated public release of advisory
CREDIT G. Geshev
BACK TO ADVISORIES