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Zero Day Initiative Advisory 11-313

Zero Day Initiative Advisory 11-313
Posted Oct 27, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-313 - 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 decodes flic file. Flic files can contain FLC Delta Decompression block containing Run Length Encoded data. When Quicktime tries to decompress this data it reads a user supplied RLE Packet count field from the file and uses that as loop counter. A high value for this field will cause Quicktime to write outside previously allocated memory which could result into remote code execution.

tags | advisory, remote, arbitrary, code execution
systems | apple
advisories | CVE-2011-3223
MD5 | d964d43fc540f8103b2e4554b8f34787

Zero Day Initiative Advisory 11-313

Change Mirror Download
ZDI-11-313 : Apple QuickTime FLC RLE Packet Count Decompression Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-313
October 27, 2011

-- CVE ID:
CVE-2011-3223

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

-- Affected Vendors:

Apple



-- Affected Products:

Apple Quicktime



-- 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 decodes flic file.
Flic files can contain FLC Delta Decompression block containing Run
Length Encoded data. When Quicktime tries to decompress this data it
reads a user supplied RLE Packet count field from the file and uses that
as loop counter. A high value for this field will cause Quicktime to
write outside previously allocated memory which could result into remote
code execution.

-- Vendor Response:

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

http://support.apple.com/kb/HT5002



-- Disclosure Timeline:
2011-06-03 - Vulnerability reported to vendor
2011-10-27 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:

* Matt "j00ru" Jurczyk


* Anonymous


* pa_kt / twitter.com/pa_kt / e1c14ba6



-- 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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