VOIP Security

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Content

Sipera Overview

Femto-Cell
Security Requirements
Sipera Systems

1

Internet Transformation
Today’s Internet

Transactional
In-band Signaling

VPN

E-Commerce

Enterprises
Enterprises

Consumers
Consumers

Application

Capability

Old Internet

Collaboration
Out-band Signaling

SOA
Enterprises
Enterprises

IMS

Web 2.0

Carriers
Carriers

Consumers
Consumers

OS Focused
Viral Threats

State-Full
Security

State-less

Store and Forward

Protocol Aware
Domain Aware
Real-time

Sipera Systems

2

Security Layers
Apps.

L6 – L7

End Points

L4 – L6

Visiting

L1 – L3

Access

Home

Sipera
Focus

Standards
Focus

Glossary
End Points
• L1 – L3
• Data Store
• Client Space
• Device Management

Visiting
• Local Data Caching
• Access Aware Policy
Access
• L1 – L3
• QoS
• Aggregation Point

Sipera Systems

Home
• Data Store
• Applications Interface
• Service Control Environment
• Foreign Network Peering Points

3

Femto-Cell Business Drivers
Operator business case issues:
! Handset Subsidies
! Backhaul

Femto-Cell business case drivers:
! Better indoor coverage
! Subsidized backhaul (Leverage broadband)
Connection
Layer Security

Application
Layer Security

Sipera Systems

Enablement
Features

4

Real-time IP services
requires special attention to security
IMS Offers a large suite of services that can be accessed through Cellular Network as well as via Internet.
Offering IMS services creates possibilities of zombies attack and hacker attacks ….
Attacks are possible despite subscription authentication & IPSec/TLS encryption.
PDSN/PDG provides authentication and encryption but
does not protect against zombie and hacker attacks.

Call
Server

PDG

IMS core

PDSN
DOrA

CSCF

Media
Gateway

Femto

GW

Internet

Mobile
Access

Broadband

~ 1/2 Billion
users

Protocol fuzzing
Flood attacks
Distributed attacks
Zombies
Stealth attacks
Bad guys could be
IMS SPAM
customers …

Zombies
BAD GUYS

Sipera Systems

5

Building a VoIP/SIP Attack
IPSEC

SIP
Server

PBX

Registrar

Media
Server

MGW

Download Tools
+
Valid Subscription

APPs
Server

IVR

MGW

VoIP/SIP Sniffing Tools

AuthTool, Cain & Abel, NetDude, Oreka, PSIPDump, SIPomatic, SIPv6 Analyzer,
VOIPong, VOMIT, Wireshark

VoIP/SIP Scanning & Enum
Tools

enumIAX, iWar, Nessus - SIP-Scan, SIPcrack, SIPSCAN, SiVuS, SMAP,
VLANping

VoIP/SIP Packet Creation &
Flooding Tools

IAXFlooder, INVITE Flooder, kphone-ddos, RTP Flooder, Scapy, SIPBomber,
SIPNess, SIPp, SIPsak

VoIP/SIP Signaling
Manipulation tools

BYE Teardown, Phone Rebooter, RedirectionPoison, RegistrationAdder,
RegistrationEraser, RegistrationHacker, SIP-Kill, SIP-Proxy-Kill, SIP-RedirectRTP

VoIP Media Manipulation Tools

RTP InsertSound, RTP MixSound, RTP Proxy

Sipera Systems

6

Unique SIP Application Layer Attacks
Signaling attacks
on infrastructure

SIP

Signaling attacks
on end users

SIP

Media attacks

RTP/
RTCP

Fuzzing

>20000

Misuse/Spoofing

19

Fuzzing

10

Reconnaissance

8

Session Anomalies

4

Floods

4

Flood

>60

Stealth

7

Misuse/Spoofing

7

Distributed Flood

>40

Spam

6

Total

21

Total

>20108

Total

36

• In 2 years, Sipera VIPER lab has discovered thousands of
attacks for SIP/UMA/IMS networks
• Proactive approach to finding threats and attacks
– Also create vaccines for previously unidentified threats

• Expertise behind Sipera IPCS products and Sipera LAVA
tools
Sipera Systems

7

SIP Network Protection Levels
Un-authorized Firewall DoSData IPS
Ping to CSCF

SGW

Firewall DoS Data IPS

IPCS

SIP Core

ICMP Flood
TCP Syn Flood
HTTP Fuzzing

Valid IPSec
tunnels

Microsoft OS Virus
Legitimate IKE traffic
Un-authorized Ping to CSCF
ICMP Flood
OS Virus

SIP Core

SIP Register Flood
Presence Update with Spoofed IMSI
RTP Flood
VCC Subscribe Fuzzing
Legitimate Traffic
Stealth Attack
SIP SPAM

Sipera Systems

8

Femto-cell
Deployment Model
VoIP
Infrastructure
F/W NAT
Traversal

SIP
AS

Domain
Policies

AAA
DMZ

Internal F/W
Sipera
IPCS 520

L4-L7 IPS

Secure
Sip
Trunking

External F/W
Femto

Internet

Sipera
IPCS 310

Femto

Femto

Enterprise

Sipera Systems

9

Femto-Cell Integration
Sipera
IPCS EMS

Femto
Broadband
AAA

HSS

Apps

Chrg

Internet Access
& IP Core
Out-of-Band
Network

Border
Router

Sipera IPCS
(other nodes)

SIP Server

Call Server

SGW

MGCF
MRFC
BGCF
SGF

P/S/I CSCF
SLF/PDF/IBCF

IMS core
Sipera
IPCS

DOrA

Mobile
Access
&Core

ABGF
IBGF

PDSN

MGW
MRFP
T-MGF

Media Gateway
IP-IP GW

Sipera Systems

10

Feature Enablement
F/W NAT Traversal
TFTP Config Proxy
Reverse HTTP Proxy

AAA server

VoIP Infrastructure

DMZ

3. Authenticate
incoming user
Internal
Firewall
+NAT

External
Firewall
+NAT

Wireless Core
Sipera
IPCS

3. Media RTP
4. Signaling
over TCP/UDP
1.

Static Firewall Channel:
to enable secure channel
between two IPCS

5060 always open
2. TLS Setup
Internet
4. Signaling over TLS
5. SRTP/ERTP Media

100 - 1000 media ports
4. Fingerprint Verification
DoS/DDoS and Fuzzing Prevention
Anomaly Detection and Prevention
Behavior Learning
Voice SPAM Prevention

5. Media Anomaly Detection and Prevention

Sipera Systems

11

Sipera Overview


Company






Founded in November 2003
HQ in Richardson, Texas
Current Headcount: 76
Experienced management team
Tier 1 VC Funded

Pure Security for VoIP, Mobile, Multimedia
Sipera™ Systems provides comprehensive, application-layer security to enable
pervasive, real-time unified communications (VoIP)

Sipera Systems

12

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