Re: Solaris Ping bug (DoS)

Brad Powell (brad.powell@WEST.SUN.COM)
Wed, 09 Jul 1997 07:27:51 -0700

Here is a simple workaround for the ping crash bug. It was posted before
but I've prettied up the fix a little putting it into a titan wrapper.

Brad
===============================cut here==================================
#!/bin/sh
# bpowell 06/21/97 generic titan wrapper for:
# add the ndd line to disable response to echo modifies S69inet
#
# Note: none

# version 0.1
#
# setup
PATH=/usr/ucb:/bin:/usr/bin:/sbin
MYNAME=`basename $0`

# Check for execution by root

if [ `/usr/xpg4/bin/id -un` != root ]
then
echo " "
echo >&2 "$MYNAME: error: must be run as root."
echo " "
exit 1
fi

# Introduction

# cat << EOF
#
# This disables ip_respond_to_echo_broadcast so that specific ping crashes
# don't work
# The program modifies /etc/rc2.d/S69inet
#
# ndd -set /dev/ip ip_respond_to_echo_broadcast 0
# EOF

# echo press enter to continue"\c"
# read YN

if test -f /etc/rc2.d/S??inet
then
echo " Now adding the new ndd command"

ed - /etc/rc2.d/S??inet <<- !
g/tcp_old_urp_interpretation
a
ndd -set /dev/ip ip_respond_to_echo_broadcast 0
.
w
Q
!

echo " Modifcations to rc2.d complete"
fi
echo " Done."