Network Security in the Patched Environment. Guy Helmer, Ph.D. Palisade Systems, Inc.
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1 Network Security in the Patched Environment Guy Helmer, Ph.D. Palisade Systems, Inc.
2 Introduction Target audience: Network Managers Topic: Transport and Application Networklayer techniques Defend vulnerabilities before, during, and after applying patches Protecting against likely future security problems Detecting new problems
3 Security Areas Data disclosure Trade secrets Data modification Accounting records Denial of service Database access
4 Introduction Vulnerabilities of patched/partially patched/unpatched systems Worms and viruses Onion approach Defense in depth
5 Vendor patching facilities Range from fully-manual to fully-automated Deployment may be limited by Testing requirements Maintenance windows Lack of vendor support
6 Patch-related Vulnerabilities Vendor lag time Prior to patch installation Undesired side effects of patches When patches failure to protect Reverse-engineered attacks based on patches (e.g., Sasser)
7 Patching Facilities Microsoft Windows Update / Software Update Services (SUS) Systems Management Server (SMS) Symantec ON icommand Shavlik HFNetCheckPro
8 Mitigating the vulnerabilities at layers 4 and 7 System inventory & Vulnerability assessment Compartmentalization Restricting applications Monitoring
9 Inventory & Vulnerability Assessment Hardware and software Points of ingress Internet Laptops VPNs Floppies/ZIP disks/usb keychains
10 Compartmentalization by Firewalls Layers 3 & 4 (IP/TCP) Classic firewall Host firewall Layer 7 (Applications) SMTP (anti-virus/spam) filter HTTP (web site) filter Peer-to-peer filter
11 Compartmentalization by Network Firewalls Layers 3 & 4 Router access control lists CheckPoint Firewall-1 Cisco PIX
12 Layer 7 Compartmentalization by Application Firewalls spam, virus and worm filtering SpamAssassin BrightMail HTTP Symantec Web Security
13 Pros Compartmentalization by Flexibility Firewalls Change configuration to protect critical systems during major situations Require authentication for network access Cost Available in many routers and switches Can build a cheap box to implement (e.g., Linux, FreeBSD, OpenBSD packet filtering firewall)
14 Issues Compartmentalization by Firewalls Flexibility Cost Overlapping network access Configuration Number of devices needed Performance Increased network latency Decreased bandwidth Additional points of failure
15 Compartmentalization by IDS/IPS Recognize/counteract attacks Prioritize patches Verify patch solution If IDS/IPS identifies successful/unsuccessful intrusions Tune firewalls/filters/ips to close vulnerabilities until patches can be applied
16 Compartmentalization by IDS Pros Detect attacks and respond Issues False positives Signature updates
17 Compartmentalization by VLANs Leverage layer 2 Ethernet and/or Layer3 IP switching capabilities Separate subnets via firewall, proxy server, or filtering router E.g., separate VLAN for laptops, linked to internal network through a firewall
18 Pros Compartmentalization by VLANs Usually available at little extra cost Issues Configuration complexity Overlapping groups Enforcement of VLAN membership Bandwidth use
19 Compartmentalization by VPNs Isolate untrusted/insecure systems or networks IPsec, SSL, L2TP Protect data in transit, plus: Use firewall, proxy server, or filtering router to isolate VPN termination point
20 Issues Compartmentalization by VLANs/VPNs Network engineering Placement of devices Maintenance of configuration
21 Restricting Applications Limit allowed applications Prohibit spyware, adware, peer-to-peer applications, other malware Lavasoft AdAware Palisade PacketHound
22 Restricting Applications Pros Limit points of vulnerability Issues Extra maintenance
23 Detecting Intrusion Detection & Prevention Systems Network Snort Network Associates IntruShield Symantec ManHunt Application Palisade PacketHound Host-based ZoneAlarm McAfee Desktop Firewall Symantec Intruder Alert
24 Detecting Anomaly Detection Tends to require manual analysis of graphs or reports Network usage trends by port and/or IP Cisco NetFlow MRTG, ntop Application trend analysis Palisade PacketHound
25 Detecting Pros Stay abreast of network activity Automatically isolate problems Cons False positives False negatives Maintenance
26 Summary and Conclusion System inventory Vulnerability assessment Compartmentalization Monitoring
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