ImageIO in Apple iOS before 4.1 on the iPhone and iPod touch allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted TIFF file.
http://support.apple.com/kb/HT4456
http://support.apple.com/kb/HT4435
http://support.apple.com/kb/HT4334
http://lists.apple.com/archives/security-announce/2010//Sep/msg00002.html
http://lists.apple.com/archives/security-announce/2010//Nov/msg00003.html
http://lists.apple.com/archives/security-announce/2010//Nov/msg00000.html