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Demystifying SIP Security: Common Misconceptions

Uncover the truth about SIP security threats and misconceptions. Learn how to protect your enterprise from known threats and implement good security practices effectively.

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Demystifying SIP Security: Common Misconceptions

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  1. The Truth of Enterprise SIP Security Common Misconceptions Alan D. Percy Director of Market Development Alan.percy@audiocodes.com

  2. Threat is widely recognized “Security Is IP Networking's Downside” Gartner Report, 2006 “T.J. Max theft is believed largest hack ever” AP Newswire, March 30, 2007 “SIP is not an easy protocol to secure.” RFC 3261 “…SIP is vulnerable to certain attacks.” RFC 3329

  3. Known Threats Known SIP Security Threats: Theft of services (unauthorized use of your network) Recording and eavesdropping Call Detail Capturing (tracking who you call and for how long) Spoofing and Man-in-the-middle (Phone Phishing) Denial of Service Attacks Registration Flooding Malformed Messages Unsolicited incoming calling (SPIT) Trojan horse devices Viruses and Worms and more.

  4. Three Misconceptions about Security

  5. Misconception #1 Eavesdropping VoIP is easy

  6. IP-PBX SIP Architecture Secured with SIP/TLS SRTP Secure Facility IP-PBX Media Gateway PSTN T1/E1 SIP SIP LAN Switch SIP Phones

  7. Points of Risk Management Signaling SIP/ TLS IP HTTPS Media SRTP

  8. Misconception #2 SIP Trunking is easy to secure with a SIP Firewall

  9. SIP Trunking is at Risk SIP Trunking without correct protection is open to DoS attack, theft of service and other threats too!

  10. Protecting Against DoS Attacks One of two approaches: Use PSTN Trunking Cannot execute a DoS attack over a PSTN circuit Media gateway insulates enterprise from outside world Enterprise uses PSTN as a “moat” around SIP Island Secure SIP Trunks with SBC Firewalls do not fully protect against DoS Many SIP Security devices don’t support SIP/TLS or SRTP Protect with an Enterprise-class Session Border Controller

  11. SBC – Includes DoS Filtering and Rate Limiting Application Intelligence DoS Filters Rate Limiting & Prioritization RADIUS Traffic Management/Shaping maintain per queue rate, size and discard policy VRRP ICMP SIP App Server ARP Request ARP Response DTMF nRT - HI SIP - Invite Dispatcher Established SIP Signaling “Pinholes” SIP - Register nRT - LO Port SIP- Response SIP - Unknown Best Effort SIP - Other SIP - Register Un-Solicited SIP Traffic SIP - Other

  12. Misconception #3 Security is very expensive

  13. AudioCodes Solutions with Security Mediant 2000 Scalable Digital Media Gateway Mediant 1000 Modular Media Gateway MediaPack MP-11x Analog Media Gateway Mediant 1000 MSBG with Integrated SBC All support HTTPS, SIP/TLS, and SRTP

  14. Good Security Practices for Enterprises Deploy encryption security (SIP/TLS and SRTP) Secure the front door (trunk lines) PSTN Trunking or Enterprise SBC Secure the back door (set and manage the passwords) Control access Manage software on all the devices in the system Eliminate WiFi access Keep an audit trail

  15. Q/A and More Information www.audiocodes.com or Alan.percy@audiocodes.com

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