Advisory Details

September 10th, 2009

Apple QuickTime FlashPix Sector Size Overflow Vulnerability

ZDI-09-064
ZDI-CAN-524

CVE ID CVE-2009-2798
CVSS SCORE
AFFECTED VENDORS Apple
AFFECTED PRODUCTS Quicktime
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8414. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT3859
DISCLOSURE TIMELINE
  • 2009-07-28 - Vulnerability reported to vendor
  • 2009-09-10 - Coordinated public release of advisory
CREDIT Damian Put
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