ImageIO in Apple iPhone OS 1.0 through 2.1 and iPhone OS for iPod touch 1.1 through 2.1 allow remote attackers to cause a denial of service (memory consumption and device reset) via a crafted TIFF image.
http://www.vupen.com/english/advisories/2008/3232
http://www.securitytracker.com/id?1021270
http://www.securityfocus.com/bid/32394
http://support.apple.com/kb/HT3318
http://secunia.com/advisories/32756
http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00002.html
http://lists.apple.com/archives/security-announce/2008/Nov/msg00002.html