CVE-2003-0882
Mac OS X before 10.3 initializes the TCP timestamp with a constant number, which allows remote attackers to determine the system’s uptime via the ID field in a TCP packet.
Date published : 2003-10-30
http://docs.info.apple.com/article.html?artnum=61798
http://lists.apple.com/mhonarc/security-announce/msg00038.html