SIP Trunking & Security. Dan York, CISSP VOIPSA Best Practices Chair

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1 SIP Trunking & Security Dan York, CISSP VOIPSA Best Practices Chair September 2, 2009

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3 Privacy Availability Compliance Confidence Mobility Cost Avoidance Business Continuity

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8 TDM security is relatively simple... PSTN Gateways TDM Switch Voic Physical Wiring

9 VoIP security is more complex Operating Systems Standards Databases Firewalls Instant Messaging Desktop PCs Voic Voice over IP Network Switches Internet Systems Wireless Devices Physical Wiring Web Servers PSTN Gateways PDAs Directories

10 VoIP can be more secure than the PSTN if it is properly deployed.

11 VoIP Security Concerns

12 Security concerns in telephony are not new Image courtesy of the Computer History Museum

13 Nor are our attempts to protect against threats Image courtesy of Mike Sandman

14 Security Aspects of IP Telephony Media / Voice Manage ment TCP/IP Network Call Control PSTN Policy

15 The SIP Call Flow Proxy A SIP Proxy B SIP SIP Alice RTP Bob

16 The SIP Call Flow Proxy A Internet SIP or WAN Proxy B SIP SIP Alice RTP Bob

17 Media Eavesdropping Degraded Voice Quality Encryption Virtual LANs (VLANs) Packet Filtering

18 Signaling Denial of Service Impersonation Toll Fraud Encryption Encrypted Phone Software Proper Programming

19 Management Web Interfaces APIs! Phones! Encryption Change Default Passwords! Patches? We don t need...

20 PSTN

21 Geography

22 Internet LAN

23 SIP Trunking

24 The Challenge of SIP Trunking PSTN SIP Service Provider Internet IP-PBX LAN

25 SIP Trunking PSTN SIP Service Provider IP-PBX Carrier Network LAN

26 The Challenge of SIP Trunking PSTN SIP Service Provider Internet IP-PBX LAN

27 SIP Trunking - Business Continuity PSTN SIP Service Provider IP-PBX Internet SIP Service Provider LAN

28 SIP Trunking - Business Continuity PSTN SIP Service Provider IP-PBX Internet SIP Service Provider LAN SIP Service Provider

29 Cloud Computing

30 Geography

31 Moving Voice Applications into the Cloud Application Platform IP-PBX Internet / WAN LAN PSTN

32 Moving Telephony into the Cloud Hosted IP-PBX Firewall Internet / WAN LAN PSTN

33 Can you trust the Cloud to be there?

34 Questions for SIP Trunk Providers or Cloud Computing Platforms? What kind of availability guarantees / Service Level Agreements (SLAs) does the platform vendor provide? What kind of geographic redundancy is built into the underlying network? What kind of network redundancy is built into the underlying network? What kind of physical redundancy is built into the data centers? What kind of monitoring does the vendor perform? What kind of scalability is in the cloud computing platform? What kind of security, both network and physical, is part of the computing platform? Finally, what will the vendor do if there is downtime? Will the downtime be reflected in your bill?

35 Spam / SPIT

36 What about SPIT? ( SPam over Internet Telephony ) What does a traditional telemarketer need? Makes for great headlines, but not yet a significant threat Fear is script/tool that: Iterates through calling SIP addresses: 111@sip.company.com, 112@sip.company.com, Opens an audio stream if call is answered (by person or voic ) Steals VoIP credentials and uses account to make calls Reality is that today such direct connections are generally not allowed This will change as companies make greater use of SIP trunking and/or directly connect IP-PBX systems to the Internet (and allow incoming calls from any other IP endpoint) Until that time, PSTN is de facto firewall SPAM

37 Resources

38 What is the Industry Doing to Help? Security Vendors VoIP Vendors The Sky Is Falling! (Buy our products!) Don t Worry, Trust Us! (Buy our products!)

39 Voice Over IP Security Alliance (VOIPSA) members from VoIP and security industries VOIPSEC mailing list Voice of VOIPSA Blog Blue Box: The VoIP Security Podcast VoIP Security Threat Taxonomy Best Practices Project underway now Security Research Market and Social Objectives and Constraints Classification Taxonomy of Security Threats Best Practices for VoIP Security Outreach Communication of Findings Security System Testing LEGEND Published Active Now Ongoing

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42 Tools, tools, tools... UDP Flooder IAX Flooder IAX Enumerator ohrwurm RTP Fuzzer RTP Flooder INVITE Flooder AuthTool BYE Teardown Redirect Poison Registration Hijacker Registration Eraser RTP InsertSound RTP MixSound SPITTER Asteroid enumiax iwar StegRTP VoiPong Web Interface for SIP Trace SIPScan SIPCrack SiVuS SIPVicious Tool Suite SIPBomber SIPsak SIP bot

43 Security Links VoIP Security Alliance - Threat Taxonomy - VOIPSEC list - Weblog - Security Tools list - Blue Box: The VoIP Security Podcast - NIST SP800-58, Security Considerations for VoIP Systems Network Security Tools Hacking Exposed VoIP site and tools

44 VoIP can be more secure than the PSTN if it is properly deployed.

45 Q&eh? Dan York - dan.york@voipsa.org

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