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Zero Day Initiative Advisory 11-340

Zero Day Initiative Advisory 11-340
Posted Dec 8, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-340 - 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.

tags | advisory, remote, arbitrary, code execution
systems | apple
advisories | CVE-2011-3248
MD5 | 54297e70e370cf6f8c2f103147b58af4

Zero Day Initiative Advisory 11-340

Change Mirror Download
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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



- -- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

http://twitter.com/thezdi
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