Putting Your Air Space to Work with Business-Class Wireless

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1 Putting Your Air Space to Work with Business-Class Wireless Dmitry Bugrimenko Cisco Expo 2006 Kiev 1

2 Cisco Unified Wireless Security Cisco Cisco Systems, Systems, Inc. Inc. All All rights rights reserved. reserved. 2

3 Cisco WLAN Security Leadership and Innovation Industry's first implementation of 802.1X/EAP authentication and dynamic key derivation Chaired and led the i work group Wrote or co-wrote many EAP RFCs Technical leadership role in Fast Secure Roaming r Industry leading, patent pending rogue detection, mitigation and suppression Continuing to innovate with Self- Defending Network Location enabled security; Access Control / IDS alerts Invented host posture analysis (NAC) Invented Management Frame Protection (MFP) Invented Self Defending Network (NIC) 3

4 Cisco Unified Wireless Network Engineered to Deliver on the SDN Strategy Cisco strategy to dramatically An initiative to improve dramatically the improve network s the network s ability to identify, ability prevent, and to identify, adapt to prevent, threats and adapt to threats Endpoint Protection Keep Clients Safe Strong Mutual Authentication Strong Encryption True Wireless IPS Adaptive Client Policies Admission Control Keep Clients Honest Network Admission Control Guest Access Anomaly and IDS/IPS Integrated Management Protect the Network Rogue AP detection and containment Multilayer client exclusions 4

5 Checklist for Secure Wireless LANs Endpoint Protection Keep Clients Safe Strong Mutual Authentication Strong Encryption True Wireless IPS Adaptive Client Policies Implementation Checklist 802.1X(EAP) WPA2 (AES) or WPA (TKIP) Management Frame Protection Cisco CSA 5

6 Protected Access What are WPA and WPA2? Authentication and Encryption standards for Wi-Fi clients and APs 802.1X authentication WPA uses TKIP encryption WPA2 uses AES encryption Which should I use? Go for the Gold! Silver, if you have legacy clients Lead, if you absolutely have no other choice (i.e. ASDs) Gold WPA2/802.11i EAP AES Silver WPA EAP TKIP Lead dwep (legacy) EAP/LEAP VLANs + ACLs 6

7 How does Extensible Authentication Protocol (EAP) Authenticate Clients? Client associates WLAN Client Access Point/ Controller Corporate Network RADIUS server Cannot send data until Data from client Blocked by AP EAP authentication complete EAP 802.1x RADIUS Client sends data Data from client Passed by AP 7

8 EAP Protocols and Database Compatibility EAP-TLS PEAP EAP-TTLS LEAP EAP-FAST Login scripts (MS DB) Password expiration (MS DB) Client & OS availability Yes 1 Yes 1 Yes N/A Yes Yes No Yes XP, 2000, CE, and others 2 XP, 2000, CE, CCXv2 clients 3, and others 2 Funk Yes Cisco/CCXv 1 or above clients and others 2 Yes Cisco/CCXv 3 clients 4 and others 2 MS DB support Yes Yes Yes Yes Yes LDAP DB support Yes Yes 5 Yes No Yes OTP support No Yes 5 Yes No No 1 Windows OS supplicant requires machine authentication (machine accounts on Microsoft AD) 2 Greater Operating System coverage is available from Meetinghouse and Funk supplicants 3 PEAP/GTC is supported on CCXv2 clients and above 4 Cisco 350/CB20A clients support EAP-FAST on MSFT XP, 2000, and CE operating systems. EAP- FAST supported on CB21AG/PI21AG clients with ADU v2.0 and CCXv3 clients 5 Supported by PEAP/GTC only, i.e., not PEAP-MSCHAPv2 8

9 EAP Best Practices Leverage existing database where possible Consider TCO of solution, not just client s/w cost Consider future of 802.1X (e.g. NAC) when deploying authentication infrastructure Be aware of EAP timing parameters, dot1x holdoff, client exclusion policies 9

10 EAP Best Practices Where practical, eliminate key authentication issues when initially implementing EAP Use Active Directory Group Policy Security configs to ease deployment of root certificate (PEAP)- or obtain EAP server cert from public CA Verify EAP server certificate includes EKU field for server authentication Self-signed certificates may be helpful for proof-ofconcept or where customers are not deploying PKI 10

11 802.11i PMK Caching Whenever an AP and a STA have successfully passed dot1x based authentication, both of them may cache the PMK record to be used later. When a STA is going to (re-)associate to an AP, it may attach a list of PMKIDs (which were derived via dot1x process with this AP before) in its RSNIE in the (re-)association request frame. When PMKID exists in STA s RSNIE, AP can use them to retrieve PMK record from its own PMK cache, if PMK is found, and matches the STA MAC address. AP can bypass dot1x authentication process, and directly starts WPA2 4- way key handshake session with the STA. PMK cache records will be kept for 1 hour for non associated STAs Enable PMK caching to bypass 802.1X Authentication 11

12 WPA-PSK WPA-PSK becoming somewhat popular recently Available on some handhelds, esp. Symbol Advantage: unique per-client, temporal keys Disadvantage: PSK shared across all clients (similar key management issues with static WEP) WPA-PSK does not function on Distributed Architecture with AAA MAC auth Make sure that customers are aware of Dictionary Attack potential with WPA-PSK PSK may be set explicitly as 64 Hex character or with passphrase which uses a well-known expansion to generate PSK Brute force attack on 256 bit key is non-trivial Strong passwords should be used if utilizing passphrase 12

13 EAP Protocols: Feature Support EAP-TLS PEAP EAP-TTLS LEAP EAP-FAST Off-line Dictionary attack vulnerability No No No Yes No Local authentication (IOS) No No No Yes Yes Application Specific Device (ASD) support No No No Yes Yes (Cisco NIC) Server certificates? Yes Yes Yes No No Client certificates? Yes No No No No Deployment complexity High Medium Medium Low Low RADIUS server scalability Impact High High High Low Low/Medium 13

14 Microsoft XP Supplicant info KB must be obtained from Microsoft directly Beware of reauthentication behaviors in Microsoft XP SP2 Should only impact non- Microsoft servers 14

15 End-user requirements Login scripts, drive mapping Network must be available to machine prior to user login Machine authentication Machine certificate Machine ID (i.e. username) CiscoSecure ACS machine authentication restriction Capability for ACS group mapping user auth w/o machine auth (note that No Access is default when enabled) 15

16 EAP-FAST Simple, Versatile, and Secure OTP EAP-FAST tunnel MSCHAPv2 UID/PW Certs AAA Simple Simple to deploy No certs to provision or manage Supports secure username/password authentication EAP-TLS PEAP-GTC EAP-TTLS PEAP-MSCHAPv2 Versatile Robust Support Fast Roaming (CCKM) IOS Local Authentication Cisco NAC Client stacks from Funk and Meetinghouse Secure Support for multiple authentication types (OTP, MSCHAPv2, Certs) Open standard (on the path to RFC) Supported in CCXv4 16

17 What makes vulnerable to attacks? Most common attacks are against management frames Common Attacks: VOID11 Aireplay File2air Airforge ASLEAP Jack attacks FakeAP Hunter/Killer Cisco MFP Protected 17

18 Management Frame Protection (MFP) A solution for clients and infrastructure (APs) Clients and APs add a MIC (signature) into every management frame Anomalies are detected instantly and reported to Wireless Control Server (WCS) MFP Protected MFP Protected 18

19 CCX- Driving Security Standardization CCX v X authentication EAP-TLS & LEAP Cisco pre-standard TKIP Client Rogue reporting CCX v3 WPA2 compliance EAP-FAST CCKM with EAP-FAST AES encryption CCX v5 MFP Client Policies CCX v2 WPA compliance Fast Roaming with CCKM PEAP CCX v4 CCKM with EAP- TLS, PEAP WIDS MBSSID 19

20 Security and WLAN Clients Trend: Embedded adapters in most devices Result: Adapter reference designs in most devices How do you ensure that all of your client devices support your chosen 802.1X type(s) and encryption option(s)? Options: Try to standardize on adapters from one vendor Use WPA/WPA2 extended EAP certified clients Rely on what is available in Windows Use a commercial supplicant suite Support a mix of authentication types Use Cisco Compatible Extensions (CCX) adapters 20

21 Cisco Security Agent (CSA) - Host Intrusion Prevention System CSA Provides Day Zero Attack Protection CSA stops day zero malicious code without reconfiguration or update. CSA has the industry s best record of stopping Zero Day exploits, worms, and viruses over past 4 years: 2001 Code Red, Nimda (all 5 exploits), Pentagone (Gonner) 2002 Sircam, Debploit, SQL Snake, Bugbear, 2003 SQL Slammer, So Big, Blaster/Welchia, Fizzer 2004 MyDoom, Bagle, Sasser, JPEG browser exploit (MS04-028), RPC-DCOM exploit (MS03-039), Buffer Overflow in Workstation service (MS03-049) 2005 Internet Explorer Command Execution Vulnerability No reconfiguration of the CSA default configuration, or update to the CSA binaries were required CSA Wireless Awareness Shutoff multiple network interfaces Disable Ad Hoc mode Connect to only corporate SSIDs 21

22 Cisco IDS Support Cisco Controller Architecture Cisco Distributed Architecture Rogue AP Detection/Location Ad-hoc network Detection RF Interference Detection Mgmt Frame (assoc, authentication) Flood EAP Frame Flood MAC Spoofing Rogue/Unregistered client with scan-mode AP Switchport Tracing WIDS Signature Analysis Rogue AP Containment Ad-hoc Network Location and Containment Client Exclusion 22

23 Cisco Unified Wireless Network Engineered to Deliver on the SDN Strategy Cisco strategy to dramatically An initiative to improve dramatically the improve network s the network s ability to identify, ability prevent, and to identify, adapt to prevent, threats and adapt to threats Endpoint Protection Keep Clients Safe Strong Mutual Authentication Strong Encryption True Wireless IPS Adaptive Client Policies Admission Control Keep Clients Honest Network Admission Control Guest Access Anomaly and IDS/IPS Integrated Management Protect the Network Rogue AP detection and containment Multilayer client exclusions 23

24 Checklist for Secure Wireless LANs Implementation Checklist Cisco NAC for wired and wireless Admission Control Cisco CSA Guest: Integrated captive Keep Clients Honest portal w/traffic tunneling Network Admission Control Guest Access 24

25 The Need for Admission Control Viruses, worms, spyware, etc. continue to plague organizations Viruses still #1 cause of financial loss* (downtime, recovery, productivity, etc.) Most users are routinely authenticated, but their endpoint devices (laptops, PCs, PDAs, etc.) are not checked for policy compliance Unprotected endpoint devices are often responsible for spreading infection Ensuring devices accessing the network comply with policy (security tools installed, enabled, and current) is difficult and expensive *2005 FBI/CSI Report Endpoint systems are vulnerable and represent the most likely point of infection from which a virus or worm can spread rapidly and cause serious disruption and economic damage. Burton Group 25

26 The NAC Solution NAC Framework Sold through NACenabled products Integrated solution leveraging Cisco network and vendor products NAC Appliance Leverages Cisco Clean Access Sold as virtual or integrated appliance Self-contained product integrates with but does not rely on partners NAC Infrastructure Offers customers a deployment timeframe choice Adapts to customers investment protection requirements 26

27 Cisco Clean Access: Out of Band Deployment VLAN based Quarantine Manager performs switch management and port assignment Server performs remediation and is deployed on the quarantine VLAN. Support for multiple switch infrastructures (2950, 3550, 3750, 4500, 6500) SNMP v1/v2c for reads SNMP v1/v2c/v3 for writes Supports multi gigabit network deployment because: Server is only in the data path for non-certified devices CCA Manager CCA Server Host retains IP address after certification Based on smart internal VLAN and DHCP mapping Does not require 802.1X infrastructure 27

28 CCA Network Configuration ACS / DHCP x/24 Clean Access Manager Internet Wireless Controller x/24 VLAN 172 & x/ Clean Access Server x/ x/24 Intranet /24 SSID guest / VLAN /24 SSID regular /VLAN

29 CCA Design Requirements All Guest & Corporate/ Regular wireless traffic coming into the Controller must go through CAS before being allowed access to the Internet and Internal/corporate network Configure dynamic interfaces called Guest and Regular in the Controller for vlan 172 and 173, respectively Trunk vlans 172 and 173 to the untrusted interface of the CAS Configure network scanning for well-known viruses and an Acceptable User Page for Guest users; Configure agent scanning for Windows Hotfixes and an Acceptable User Page for Regular users Optionally, set user timeout session, bandwidth and access control management uniquely for Guest and Regular users The Guest user will be redirected to a weblogin and must click on Guest access button; Regular user will be redirected to a weblogin and must use the CCA Agent 29

30 NAC2 Ubiquitous Admission Control CTA-Capable Endpoints with NAC-Capable 802.1X Supplicants CTA x 2 EAPo802.1x Network Access Device (NAD) EAPoRADIUS ACS X connection setup between NAD and endpoint 2. NAD requests credentials from endpoint (EAPo802.1X) This may include user, device, and/or posture HCAP 3. CTA, via NAC-capable supplicant, sends credentials to NAD (EAPo802.1X) 4. NAD sends credentials to ACS (EAPoRADIUS) 5. ACS can proxy portions of posture authentication to vendor server (HCAP) User/device credentials sent to authentication databases (LDAP, Active Directory, etc) 6. ACS validates credentials, determines authorization rights E.g. visitors given GUEST access, unhealthy devices given QUARANTINE access 7. ACS sends authorization policy to NAD (VLAN assignment) 8. Host assigned VLAN, may then gain IP access (or denied, restricted) Network Vendor Server 30

31 Secure Guest Access DMZ Guest controller Captive portal native in the controller Two options for guest access: Enterprise Network Switch-to-switch guest tunnel (1) Guest users can be placed on guest VLAN (2) All guest traffic is tunneled to a guest controller SSID Client Default Gateway = Internal = GUEST User DB can be local or RADIUS Robust administration Ambassador login Enterprise user Guest user Customizable web pages 31

32 Cisco Unified Wireless Network Engineered to Deliver on the SDN Strategy Cisco strategy to dramatically An initiative to improve dramatically the improve network s the network s ability to identify, ability prevent, and to identify, adapt to prevent, threats and adapt to threats Endpoint Protection Keep Clients Safe Strong Mutual Authentication Strong Encryption True Wireless IPS Adaptive Client Policies Admission Control Keep Clients Honest Network Admission Control Guest Access Anomaly and IDS/IPS Integrated Management Protect the Network Rogue AP detection and containment Multilayer client exclusions 32

33 Checklist for Secure Wireless LANs Implementation Checklist Wireless IDS Rogue Detect/Containment FIPS Anomaly and IDS/IPS Protect the Network Rogue AP detection and containment Multilayer client exclusions 33

34 Protect the Network: wids Detection and Containment HYPE: External wids sensors are the best way to detect and remediate all wireless attacks REALITY: Most attacks/events occur on the AP/Client channel ROGUES and AD HOCs: Detected quickly via intelligent off channel scanning 9On-channel attack detected a Channel 153 9Off channel rogue detected Rogue AP 9AP contains rogue client 9Off channel ad hoc net 9AP contains ad g Channel 1 detected hoc net Ad Hoc client ent m n i onta C RF Containment F R a Channel 153 Rogue client g Channel 6 Valid client g Channel 1 Ad Hoc client g Channel 6 Attacker a Channel 152 Valid client 34

35 A Complete Solution for Handling Rogues 1. Detect Rogue AP (Generate alarm) 2. Assess Rogue AP (Identity, Location,..) 3. Contain Rogue AP 4. View Historical Report Can be automated Multiple rogues contained simultaneously 35

36 Cisco WCS Centralized Security Management 36

37 Cisco Unified Wireless Network Engineered to Deliver on the SDN Strategy Cisco strategy to dramatically An initiative to improve dramatically the improve network s the network s ability to identify, ability prevent, and to identify, adapt to prevent, threats and adapt to threats Endpoint Protection Keep Clients Safe Strong Mutual Authentication Strong Encryption True Wireless IPS Adaptive Client Policies Admission Control Keep Clients Honest Network Admission Control Guest Access Anomaly and IDS/IPS Integrated Management Protect the Network Rogue AP detection and containment Multilayer client exclusions 37

38 Security Management CS-MARS Network wide anomaly detection Rules based correlation WCS Simple, Powerful Dashboard Robust Reporting 38

39 Checklist Summary Endpoint Protection Keep Clients Safe Strong Mutual Authentication Strong Encryption True Wireless IPS Adaptive Client Policies Admission Control Keep Clients Honest Network Admission Control Guest Access Anomaly and IDS/IPS Protect the Network Rogue AP detection and containment Multilayer client exclusions 802.1X (EAP) WPA2 (AES) or WPA (TKIP) Management Frame Protection Cisco CSA Cisco NAC for wired and wireless Cisco CSA Guest: Integrated captive portal w/traffic tunneling Wireless IDS Rogue Detect/Contain FIPS 39

40 The Cisco Difference Unifying wireless and wire line Utilizing all of Cisco s security expertise and product line Not reinventing the wheel Location, Location, Location Only WLAN system with RF fingerprinting for rogue location accuracy INTEGRATED air monitoring Only WLAN system that does not require separate air monitors Built-in rogue protection and intrusion detection Security Designed for Real-Time Applications Fast Secure roaming Active leadership in standards bodies i, r, w, k 40

41 41

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