TippingPoint Zero Day Initiative

(Pwn2Own\Pwn4Fun) Apple Webkit JSStringJoiner Memory Corruption Remote Code Execution Vulnerability

ZDI-14-090: April 11th, 2014


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 13734. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple WebKit. 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 string objects. The issue lies in the joining of strings in an array. 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

    2014-03-13 - Vulnerability reported to vendor
    2014-04-11 - Coordinated public release of advisory


This vulnerability was discovered by:
    Ian Beer of Google Project Zero