Apple Safari 1.0 through 1.1 on Mac OS X 10.3.1 and Mac OS X 10.2.8 allows remote attackers to steal user cookies from another domain via a link with a hex-encoded null character (%00) followed by the target domain.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7973
http://marc.info/?l=bugtraq&m=106917674428552&w=2
http://lists.apple.com/mhonarc/security-announce/msg00042.html