TippingPoint Zero Day Initiative
 

Apple QuickTime FlashPix Sector Size Overflow Vulnerability

ZDI-09-064: September 10th, 2009

CVE ID

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8414. 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 during the parsing of malformed FlashPix (.fpx) files. While parsing the SectorShift and cSectFat fields from the header, the application will multiply 2 user-controlled 32-bit values and utilize this for an allocation. If the result of the multiplication is greater than 32bits, the application will allocate an undersized heap chunk. Later, the application will copy file data directly into this buffer leading to a buffer overflow which can allow for code execution under the context of the currently logged in user.

Vendor Response

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

Disclosure Timeline

    2009-07-28 - Vulnerability reported to vendor
    2009-09-10 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Damian Put