WebKit in Apple Safari before 4.0, iPhone OS 1.0 through 2.2.1, and iPhone OS for iPod touch 1.1 through 2.2.1 does not properly handle redirects, which allows remote attackers to read images from arbitrary web sites via vectors involving a CANVAS element and redirection, related to a "cross-site image capture issue."
http://www.vupen.com/english/advisories/2011/0212
http://www.vupen.com/english/advisories/2009/1621
http://www.vupen.com/english/advisories/2009/1522
http://www.securityfocus.com/bid/35322
http://www.securityfocus.com/bid/35260
http://www.debian.org/security/2009/dsa-1950
http://support.apple.com/kb/HT3639
http://support.apple.com/kb/HT3613
http://secunia.com/advisories/43068
http://secunia.com/advisories/37746
http://secunia.com/advisories/35379
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
http://lists.apple.com/archives/security-announce/2009/jun/msg00002.html
http://lists.apple.com/archives/security-announce/2009/Jun/msg00005.html