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

July 24th, 2019
ZDI-19-677 ZDI-CAN-7864

CVE ID

CVE-2019-8686

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

WebKit

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 GraphicsContext 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-gu/HT210346

Disclosure Timeline

  • 2019-01-25 - Vulnerability reported to vendor
  • 2019-07-24 - Coordinated public release of advisory

Credit

G. Geshev

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