The libtiff package contains a library of functions for manipulating TIFF (Tagged Image File Format) files.
Tavis Ormandy of Google discovered a number of flaws in libtiff during a security audit. An attacker could create a carefully crafted TIFF file in such a way that it was possible to cause an application linked with libtiff to crash or possibly execute arbitrary code. (CVE-2006-3459, CVE-2006-3460, CVE-2006-3461, CVE-2006-3462, CVE-2006-3463, CVE-2006-3464, CVE-2006-3465)
All users are advised to upgrade to these updated packages, which contain backported fixes for these issues.