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Spoofed Packet Defenses Get TTL of suspected spoofed packet • Probe the source address in the packet Compare the probe reply's TTL to the suspected spoofed packet
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Classroom Contents
Strategies for Defeating Distributed Attacks
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- 1 Intro
- 2 Assume basics - Understand IP addressing - Understand basic system administration
- 3 Attack Recognition Problems Blended "patter" and "effect" attacks • Sniffing attacks Decoys and false identification of attack source
- 4 Attack Recognition Problems • Blended "patter" and "effect" attacks • Sniffing attacks Decoys and false identification of attack source
- 5 Changing Attack Patterns • More large-scale attacks • Better enumeration and assessment of the target by the attacker
- 6 Two Basic Distributed Attack Models • Attacks that do not require direct observation of the results • Attacks that require the attacker to directly observe the results
- 7 Defensive Techniques Cont. Minimal ports open Stateful inspection firewalls Modified kernels/IDS to look for fingerprint packets
- 8 Defensive Techniques Cont. Limit ICMP inbound to host/destination unreachable Limit outbound ICMP
- 9 DMZ Server Recommendations Split services between servers Current patches • Use trusted paths, anti-buffer overflow settings and kernel patches • Use any built-in firewalling software • Make use of b…
- 10 Firewall Rules Limit inbound to only necessary services • Limit outbound via proxies to help control access • Block all outbound to only necessary traffic
- 11 Intrusion Detection Systems • Use only IDS's that can be customized • IDS should be capable of handling fragmented packet reassembly • IDS should handle high speeds
- 12 Spoofed Packet Defenses Get TTL of suspected spoofed packet • Probe the source address in the packet Compare the probe reply's TTL to the suspected spoofed packet
- 13 Late Breaking News • HackerShield RapidFire Update 208
