ipfw and ip6fw in FreeBSD 4.2 and earlier allows remote attackers to
bypass access restrictions by setting the ECE flag in a TCP packet,
which makes the packet appear to be part of an established connection.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20010125 ecepass - proof of concept code for FreeBSD ipfw bypass
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