iAd Content Display in Apple iOS before 4.2 allows man-in-the-middle attackers to make calls via a crafted URL in an ad.
https://exchange.xforce.ibmcloud.com/vulnerabilities/63417
http://www.vupen.com/english/advisories/2010/3046
http://www.securitytracker.com/id?1024768
http://support.apple.com/kb/HT4456
http://secunia.com/advisories/42314
http://lists.apple.com/archives/security-announce/2010//Nov/msg00003.html