TippingPoint Zero Day Initiative

Apple Safari BoundFunction Out-Of-Bounds Access Remote Code Execution Vulnerability

ZDI-17-820: September 26th, 2017


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 28288. For further product information on the TippingPoint IPS:

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 BoundFunction objects. By performing actions in JavaScript, an attacker can trigger a memory access past the end of an allocated object. 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

    2017-05-04 - Vulnerability reported to vendor
    2017-09-26 - Coordinated public release of advisory


This vulnerability was discovered by:
    Samuel Gro and Niklas Baumstark