TippingPoint Zero Day Initiative

(Pwn2Own) Apple Safari Spread Operator Integer Overflow Remote Code Execution Vulnerability

ZDI-17-358: May 18th, 2017


CVSS Score

Affected Vendors

Affected Products

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 handling of the spread operator. 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 under the context of the current process.

Vendor Response

Apple has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2017-03-17 - Vulnerability reported to vendor
    2017-05-18 - Coordinated public release of advisory


This vulnerability was discovered by:
    Samuel Groß and Niklas Baumstark