Microsoft released an advisory which I think is referring to the Safari "carpet bomb" threat.
http://www.microsoft.com/technet/security/advisory/953818.mspx
See
http://blogs.zdnet.com/security/?p=1212
and
http://www.oreillynet.com/onlamp/blog/2008/05/safari_carpet_bomb.html and
http://blogs.zdnet.com/Apple/?p=1424
Read the complete post at http://msmvps.com/blogs/bradley/archive/2008/05/31/the-carpet-bomb-threat.aspx