ZDI-11-340 : Apple Quicktime Font Table Signed Length Remote Code Execution Vulnerability

[ZDI Disclosures <zdi-disclosures@xxxxxxxxxxxxxxxx>]

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ZDI-11-340 : Apple Quicktime Font Table Signed Length Remote Code
Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-340
December  7, 2011

- -- CVE ID:
CVE-2011-3248

- -- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

- -- Affected Vendors:

Apple



- -- Affected Products:

Apple Quicktime



- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11876.
For further product information on the TippingPoint IPS, visit:

    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 within how the application parses font names
embedded within an atom. When parsing the font name, the application
will treat a length from the file as a signed value when copying font
data into a buffer. Due to an unsigned promotion, this can be used to
write outside the bounds of a buffer which can lead to code execution
under the context of the application.

- -- Vendor Response:

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

http://support.apple.com/kb/HT5016



- -- Disclosure Timeline:
2011-07-20 - Vulnerability reported to vendor
2011-12-07 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* Luigi Auriemma



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