CVE-2000-1167
ppp utility in FreeBSD 4.1.1 and earlier does not properly restrict access as specified by the "nat deny_incoming" command, which allows remote attackers to connect to the target system.
Date published : 2001-01-22
http://www.securityfocus.com/bid/1974
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:70.ppp-nat.asc