TippingPoint Zero Day Initiative

Apple OS X ACMP4AACBaseDecoder Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-16-439: July 20th, 2016


CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows remote attackers to leak sensitive information 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 MOV files. The issue lies in the failure to validate a user-supplied value prior to using it as the size parameter in a call to memcpy. An attacker can leverage this vulnerability to leak sensitive information in 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

    2016-05-05 - Vulnerability reported to vendor
    2016-07-20 - Coordinated public release of advisory


This vulnerability was discovered by:
    Steven Seeley of Source Incite