ZDI-11-107: Libtiff ThunderCode Decoder THUNDER_2BITDELTAS Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-107

March 21, 2011

-- CVE ID:
CVE-2011-1167 

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

-- Affected Vendors:
Libtiff

-- Affected Products:
Libtiff libtiff

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TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10729. 
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-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of libtiff. 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 implementation of the ThunderDecode
codec. While decoding a particular code within a row, the decoder will
fail to accommodate for the total expanded size of the row. This can
cause a heap-based buffer overflow which can lead to code execution
under the context of the application utilizing the library.

-- Vendor Response:
Libtiff has issued an update to correct this vulnerability. More
details can be found at:

http://bugzilla.maptools.org/show_bug.cgi?id=2300

-- Disclosure Timeline:
2011-01-21 - Vulnerability reported to vendor
2011-03-21 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Martin Barbella

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