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Re: Solaris Ping bug (DoS)
From: brad.powell () WEST SUN COM (Brad Powell)
Date: Wed, 9 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."



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