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1 Security CS 161/194-1 Anthony D. Joseph November 21, 2005 s Outline Static and Dynamic Content Firewall review Adding a DMZ Secure Topologies 2 1
2 Polls How many people have set up a personal web server? How many people have set up a business web server? 3 s server serves up static, read-only content from file server Scales up by replicating web servers Can use DNS round-robin or load balancer 4 2
3 s DB Add a database server for dynamic content DB used to store per-user info or site content Also, used for authentication, read/write actions, e-commerce, Software connector to DB server Object/Java DataBase Connectivity 5 s Static content model: server uses file server for static content, templates, Dynamic content model: server uses database server to retrieve/store dynamic content Can have mixtures Ex: Storing dynamic content in FS Ex: Storing static content in DB What are the security issues? 6 3
4 Some Threats and Attacks Replace static content ( defacement ) Exploit vulnerability to access or servers (Distributed) Denial of Service attack Request large image or emulate complex transaction Unauthorized database access Exploit vulnerability (e.g., SQL injection) to read/write database Attack server OS or other services Exploit vulnerability to disable server 7 Replace Static Content ( Defacement ) Cracker exploits a vulnerability to gain access to or s Examples: Flaws in CGI programs Flaws in URL processing Buffer overflows Replaces web pages with their own May also access protected content 8 4
5 (Distributed) Denial of Service Attack Cracker performs resource exhaustion attack Overwhelm network, CPU, disk bandwidth, Examples Request large image or file POST large image or file (requires many zombies) Emulate complex transaction Typically use large number of zombies (1,000 s to 100,000 s) 9 Unauthorized Database Access Cracker exploits vulnerability in server to DB server connection to read/write database Example: Use URL or POST attack to inject SQL code Gain access to server, then connect to DB Attacks can compromise DB integrity 10 5
6 Attack OS or Other Services Cracker exploits vulnerability to gain access to server Many OS and service vulnerabilities Can be a stepping stone to attacking web service or accessing database 11 Stopping Some Attacks Replace static content ( defacement ) Harden server (latest patch levels, minimum services) Limit data on file server (Distributed) Denial of Service attack Add load balancer, DNS round-robin, replicated clusters, Unauthorized database access Harden server (latest patch levels, minimum services) Sanity check all arguments Attack server OS or other services Harden servers (latest patch levels, minimum services) 12 6
7 Problems Hard to keep servers up-to-date with patches Zero-day exploits Delays in releasing, retrieving, testing, installing patches DDoS attacks still impose load on servers Add layered defense Place firewall between and server 13 Firewall Default firewall rule: deny all Other firewall rules: allow *,*,TCP -> <web server IP>,80 allow *,*,TCP -> <web server IP>,443 Add stateful inspection rules for known attacks: Code Red, Nimda, 14 7
8 FW Benefits Intranet VPN Helps harden servers by blocking all but web traffic Can help with DDoS attacks by adding stateful rules (examining content) or blocking zombie IP subnets Doesn t work for all content attacks Problems? How to access Intranet (Internal LAN) and server? 15 We can add more rules Firewall Issues For access to Intranet, server, and other public servers But, what happens if one server or Intranet machine is compromised? This is the classic firewall problem: All our machines are now vulnerable! Real issue: We need to both protect public servers and Intranet Solution: Place public servers in a DMZ 16 8
9 DeMilitarized Zone (DMZ) Intranet DMZ Separate firewall rules for internal zone and DMZ -DMZ rules only allow web, traffic DMZ-Intranet rules only allow access to file, , remote login from DMZ No -Intranet access Should server be in intranet or DMZ? Add proxy to isolate access/storage from forwarding VPN Proxy 17 Designing a More Secure Topology Staging DB Design a more secure version of this figure Where to place firewall, DMZ, servers, proxies,? What are the rules? Intranet Login Primary DB VPN 18 9
10 Design 19 One Solution DMZ Staging DB -DMZ rules allow web, , VPN only DMZ-Intranet rules allow file, , staging DB, remote login access only from DMZ hosts -Intranet rules deny all VPN Proxy Intranet Staging DB Login Primary DB 20 10
11 Summary Public servers are vulnerable to attack OS and services Eliminate unnecessary services Apply all patches Use a DMZ to provide layered defense Place server/proxy in DMZ Place database/file/ real servers in Intranet Deny all default for -Intranet traffic 21 11
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