Advisory Details

May 30th, 2019

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

ZDI-19-535
ZDI-CAN-8004

CVE ID CVE-2019-6237
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 vulnerable 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 createRenderers method. 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/HT210119
DISCLOSURE TIMELINE
  • 2019-03-04 - Vulnerability reported to vendor
  • 2019-05-30 - Coordinated public release of advisory
CREDIT G. Geshev
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