The TIFFExtractData macro in LibTIFF before 3.9.4 does not properly handle unknown tag types in TIFF directory entries, which allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted TIFF file. References: http://thread.gmane.org/gmane.comp.security.oss.general/3075/focus=3097 http://bugzilla.maptools.org/show_bug.cgi?id=2210
According to Dan Rosenberg's report, this was originally reported to iDefense. Dan did not publish too much details about this issue, as it's addressed by Tom's patch from upstream bug report #2210.
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2010:0519 https://rhn.redhat.com/errata/RHSA-2010-0519.html