Bugtraq: Re: DCC HiJacking patch for BitchX 75p1

[rain () INSANE LOONYBIN NET (Ben Winslow)]

On Sun, 18 Oct 1998, Alessio Orlandi wrote:

# Hi all,
#    as recently discovered, with a simple port scan you can hijack some
# of the BitchX dcc
# connections. This due to the port assigning on the requesting client.
# Here follows a really short patch that will fix the problem. The problem
# is here:
# BitchX when creates a DCC connection (listening socket) uses the
# functions
# connect_by_number (defined in network.c file). Passing as port 0
# This means that the OS will determine the port. Now.. for mental order..
# the ports will be quiet consecutive. Bad.. Bad... So.. let's add a
# random value to the port returned by the system. All is now fixed.
# Patch follows
# -----------------------------------------------------------------------------------------
#
# Regards
#                                                           Alessio
# "NaiL^d0d () ircnet/ircity" Orlandi
# Thanks to: hackers () ircity Litos (you one of my best friend), Nervous,
# awgn (hehe),
#                                         Lordfelix (salam), Raptor,
# BlackJam, kasko, antirez
#          and  hackers.it () ircnet Soren, NaiF, Bonjo
# ----------------------------------------------------------------------------------------
#
#
#
This patch won't work-- what if a port you decide on is already in use by
something else?

        Ben