Libtiff ThunderCode Decoder THUNDER_2BITDELTAS Remote Code Execution Vulnerability

March 21st, 2011
ZDI-11-107 ZDI-CAN-1004

CVE ID

CVE-2011-1167

CVSS Score

9.0 AV:N/AC:L/Au:N/C:P/I:P/A:C

Affected Vendors

Libtiff

Affected Products

libtiff

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.

Additional Details

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

Martin Barbella

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