WebKit in Apple iOS before 4.2 allows remote attackers to bypass the remote image loading setting in Mail via an HTML LINK element with a DNS prefetching property, as demonstrated by an HTML e-mail message that uses a LINK element for X-Confirm-Reading-To functionality, a related issue to CVE-2010-3813.
lists.apple.com/archives/security-announce/2010//Nov/msg00003.html
lists.apple.com/archives/security-announce/2011//Jul/msg00002.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
secunia.com/advisories/42314
secunia.com/advisories/43068
support.apple.com/kb/HT4456
support.apple.com/kb/HT4808
www.securitytracker.com/id?1024773
www.vupen.com/english/advisories/2010/3046
www.vupen.com/english/advisories/2011/0212
exchange.xforce.ibmcloud.com/vulnerabilities/63418