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Table of Contents
7. General Tips..................................................................................................................................................40
8. Appendix........................................................................................................................................................43
8.1. Servers, Ports, and Packets.............................................................................................................43
8.2. Common Ports................................................................................................................................45
8.3. Netstat Tutorial...............................................................................................................................48
8.3.1. Overview.........................................................................................................................48
8.3.2. Port and Process Owners................................................................................................52
8.4. Attacks and Threats.........................................................................................................................56
8.4.1. Port Scans and Probes.....................................................................................................56
8.4.2. Rootkits...........................................................................................................................57
8.4.3. Worms and Zombies.......................................................................................................57
8.4.4. Script Kiddies.................................................................................................................58
8.4.5. Spoofed IPs.....................................................................................................................58
8.4.6. Targeted Attacks.............................................................................................................58
8.4.7. Denial of Service (DoS)..................................................................................................59
8.4.8. Brute Force.....................................................................................................................59
8.4.9. Viruses............................................................................................................................60
8.5. Links...............................................................................................................................................60
8.6. Editing Text Files............................................................................................................................62
8.7. nmap................................................................................................................................................65
8.8. Sysctl Options.................................................................................................................................68
8.9. Secure Alternatives.........................................................................................................................70
8.10. Ipchains and Iptables Redux.........................................................................................................70
8.10.1. ipchains II.....................................................................................................................70
8.10.2. iptables II......................................................................................................................74
8.10.3. Summary.......................................................................................................................78
8.10.4. iptables mini−me..........................................................................................................79
Security Quick−Start HOWTO for Red Hat Linux
ii
- Hal Burgiss 1
- Table of Contents 2
- 1. Introduction 4
- 1.2. Notes 5
- 1.3. Copyright 5
- 1.4. Credits 6
- 1.5. Disclaimer 6
- 1.7. Feedback 7
- 2. Foreword 8
- 2.2. Before We Start 9
- 3.1. System Audit 10
- 3.3. Stopping Services 12
- 3.3.1. Stopping Init Services 13
- 3.3.2. Inetd 14
- 3.3.2. Inetd 12 15
- 3.3.3. Xinetd 16
- 3.3.4. When All Else Fails 17
- 3.4. Exceptions 18
- 4. Step 2: Updating 20
- 4. Step 2: Updating 18 21
- 5.1. Strategy 22
- 5.2.1. ipchains 23
- 5.2.1. ipchains 21 24
- 5.2.2. iptables 26
- 5.2.2. iptables 24 27
- 5.3. Tcpwrappers (libwrap) 29
- 5.3.1. xinetd 31
- 5.4. PortSentry 32
- 5.5. Proxies 32
- 5.6. Individual Applications 33
- 5.7. Verifying 35
- 5.8. Logging 36
- 5.9. Where to Start 37
- 6. Intrusion Detection 39
- # chattr +i /bin/ps 40
- −−−i−−−−−−−−−− /bin/ps 40
- # chattr −i /bin/ps 40
- 7. General Tips 43
- # must exist 44
- root: hal@bigcat 44
- 8. Appendix 46
- 8.2. Common Ports 48
- 8.3. Netstat Tutorial 51
- 8.4. Attacks and Threats 59
- 8.4.2. Rootkits 60
- 8.4.3. Worms and Zombies 60
- 8.4.4. Script Kiddies 61
- 8.4.5. Spoofed IPs 61
- 8.4.6. Targeted Attacks 61
- 8.4.8. Brute Force 62
- 8.5. Links 63
- 8.6. Editing Text Files 65
- 8.7. nmap 68
- 8.8. Sysctl Options 71
- 8.8. Sysctl Options 69 72
- 8.9. Secure Alternatives 73
- 8.9. Secure Alternatives 71 74
- 8.9. Secure Alternatives 72 75
- 8.9. Secure Alternatives 73 76
- 8.10.2. iptables II 77
- 8.10.2. iptables II 75 78
- 8.10.2. iptables II 76 79
- 8.10.2. iptables II 77 80
- 8.10.3. Summary 81
- 8.10.4. iptables mini−me 82
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