Cross-domain vulnerability in Microsoft Internet Explorer 6 and 7 allows remote attackers to change the location property of a frame via the String data type, and use a frame from a different domain to observe domain-independent events, as demonstrated by observing onkeydown events with caballero-listener. NOTE: according to Microsoft, this is a duplicate of CVE-2008-2947, possibly a different attack vector.
http://www.vupen.com/english/advisories/2008/1941/references
http://www.kb.cert.org/vuls/id/516627
http://technet.microsoft.com/en-us/security/cc405107.aspx#EHD
http://sirdarckcat.blogspot.com/2008/05/browsers-ghost-busters.html