TippingPoint Zero Day Initiative

Apple Quicktime Apple Lossless Audio Codec Parsing Remote Code Execution Vulnerability

ZDI-11-230: June 29th, 2011


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11428. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Quicktime. 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 way Quicktime handles Apple Lossless Audio Codec streams. While parsing the sample description for the 'alac' codec an integer wrap can occur that results in the allocation of a memory buffer that is smaller than intended. When Quicktime writes to this buffer it causes a memory corruption that can lead to remote code execution 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

    2011-04-11 - Vulnerability reported to vendor
    2011-06-29 - Coordinated public release of advisory


This vulnerability was discovered by:
    Luigi Auriemma
    Damian Put