TippingPoint Zero Day Initiative

Apple OS X morx nSubtables Memory Corruption Remote Code Execution Vulnerability

ZDI-15-287: July 1st, 2015


CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple OS X. 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 font collection files. The issue lies in the parsing of the 'morx' table. An attacker can leverage this vulnerability to execute code under the context of the current user.

Vendor Response

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

Disclosure Timeline

    2015-02-26 - Vulnerability reported to vendor
    2015-07-01 - Coordinated public release of advisory


This vulnerability was discovered by:
    Pawel Wylecial