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ZDI-11-107: Libtiff ThunderCode Decoder THUNDER_2BITDELTAS Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Mon, 21 Mar 2011 21:37:13 +0000

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

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10729. 
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 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

-- 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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