Advisory Details

August 27th, 2019

Apple Safari Integer Overflow Remote Code Execution Vulnerability

ZDI-19-765
ZDI-CAN-8359

CVE ID CVE-2019-8601
CVSS SCORE 8.8, AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 emitAllocateButterfly method. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before allocating a buffer. 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/HT210125
DISCLOSURE TIMELINE
  • 2019-08-20 - Vulnerability reported to vendor
  • 2019-08-27 - Coordinated public release of advisory
CREDIT fluoroacetate (@fluoroacetate)
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