TippingPoint Zero Day Initiative

Libtiff ThunderCode Decoder THUNDER_2BITDELTAS Remote Code Execution Vulnerability

ZDI-11-107: March 21st, 2011


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10729. For further product information on the TippingPoint IPS:

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:

Disclosure Timeline

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


This vulnerability was discovered by:
    Martin Barbella