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Hack Attacks Revealed A Complete Reference with Custom Security Hacking Toolkit John Chirillo This netLibrary eBook does not include the ancillary media that was packaged with the original printed version of the book. Publisher: Robert Ipsen Editor: Carol A. Long Assistant Editor: Adaobi Obi Managing Editor: Micheline Frederick New Media Editor: Brian Snapp Text Design & Composition: Thomark Design Designations used by companies to distinguish their products are often claimed as trademarks. In all instances where John Wiley & Sons, Inc., is aware of a claim, the product names appear in initial capital or ALL CAPITAL LETTERS. Readers, however, should contact the appropriate companies for more complete information regarding trademarks and registration. Copyright © 2001 by John Chirillo. All rights reserved. Published by John Wiley & Sons, Inc. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per- copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750- 8400, fax (978) 750-4744. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 605 Third Avenue, New York, NY 10158-0012, (212) 850-6011, fax (212) 850-6008, E-Mail: PERMREQ @ WILEY.COM. This publication is designed to provide accurate and authoritative information in regard to the subject matter covered. It is sold with the understanding that the publisher is not engaged in professional services. If professional advice or other expert assistance is required, the services of a competent professional person should be sought. This title is also available in print as ISBN 0-471-41624-X For more information about Wiley products, visit our web site at www.Wiley.com Contents Acknowledgments xi A Note to the Reader xii Introduction xiii Part I: In the Beginning 1 Chapter 1 Understanding Communication Protocols 3 A Brief History of the Internet 3 Internet Protocol 5 IP Datagrams, Encapsulation, Size, and Fragmentation 8 IP Addresses, Classes, Subnet Masks 10 Subnetting, VLSM, and Unraveling IP the Easy Way 11 ARP/RARP Engineering: Introduction to Physical Hardware Address Mapping 22 ARP Encapsulation and Header Formatting 23 RARP Transactions, Encapsulation 24 RARP Service 25 Transmission Control Protocol 25 Sequencing and Windowing 26 TCP Packet Format and Header Snapshots 26 Ports, Endpoints, Connection Establishment 28 User Datagram Protocol 30 UDP Formatting, Encapsulation, and Header Snapshots 30 Multiplexing, Demultiplexing, and Port Connections 31 Internet Control Message Protocol 32 ICMP Format, Encapsulation, and Delivery 32 ICMP Messages, Subnet Mask Retrieval 33 ICMP Header Snapshots 36 Moving Forward 36 Chapter 2 NetWare and NetBIOS Technology 37 NetWare: Introduction 37 Internetwork Packet Exchange 37 Sequenced Packet Exchange 44 SPX Format, Header Snapshots 44 Connection Management, Session Termination 45 Watchdog Algorithm 45 Error Recovery, Congestion Control 47 Wrapping Up 47 NetBIOS Technology: Introduction 47 Naming Convention, Header Snapshots 48 General, Naming, Session, and Datagram Services 48 NetBEUI: Introduction 50 NetBIOS Relationship 50 Windows and Timers 50 Conclusion 51 Part II: Putting It All Together 53 Chapter 3 Understanding Communication Mediums 55 Ethernet Technology 55 Carrier Transmissions 56 Ethernet Design, Cabling, Adapters 57 Hardware Addresses, Frame Formats 60 Token Ring Technology 60 Operation 62 Token Ring Design, Cabling 62 Prioritization 62 Fault Management 63 Addresses, Frame Format 63 Fiber Distributed Data Interface Technology 64 Operation 65 FDDI Design, Cabling 66 Frame Format 66 Analog Technology 67 Problem Areas and Remedies 67 System Registry 69 Integrated Services Digital Network Technology 71 ISDN Devices 71 ISDN Service Types 72 ISDN versus Analog 72 Digital Subscriber Line 73 Point-to-Point Technology 74 PPP Operation 74 Frame Structure 75 Frame Relay Technology 76 Operation, Devices, Data-Link Connection Identifiers, and Virtual Circuits 76 Congestion Notification and Error Checking 78 Local Management Interface 78 Frame Relay Frame Format 79 Looking Ahead 79 Part III: Uncovering Vulnerabilities 81 Intuitive Intermission A Little Terminology 83 Who Are Hackers, Crackers, Phreaks, and Cyberpunks? 83 What Is Hacking? 84 Profiling the Hacker 87 Security Levels 88 Security Class C1: Test Condition Generation 88 Security Class C2: Test Condition Generation 89 Security Class B1: Test Condition Generation 90 Security Class B2: Test Condition Generation 91 Kickoff 92 Chapter 4 Well-Known Ports and Their Services 93 A Review of Ports 93 TCP and UDP Ports 94 Well-Known Port Vulnerabilities 94 Unidentified Ports and Services 109 What’s Next 147 Chapter 5 Discovery and Scanning Techniques 149 Discovery 149 Whois Domain Search Query 151 Host PING Query 153 Internet Web Search Query 156 Social Engineering Query 156 Site Scans 157 Scanning Techniques 158 Scanner Packages 159 Sample Scan 173 Summary 180 Part IV: Hacking Security Holes 181 Intuitive Intermission A Hacker’s Genesis 183 Chapter 6 The Hacker’s Technology Handbook 189 Networking Concepts 189 Open Systems Interconnection Model 189 Cable Types and Speeds versus Distances 191 Decimal, Binary, and Hex Conversions 192 Protocol Performance Functions 204 Networking Technologies 205 Media Access Control Addressing and Vendor Codes 205 Ethernet 206 Token Ring 215 Token Ring and Source Route Bridging 216 Token Ring and Source Route Translational Bridging 221 Fiber Distributed Data Interface 223 Routing Protocols 225 Distance Vector versus Link State Routing Protocols 226 Routing Information Protocol 228 Interior Gateway Routing Protocol 229 Appletalk Routing Table Maintenance Protocol 230 Open Shortest Path First Protocol 230 Important Commands 231 Append 232 Assign 233 Attrib 234 Backup 234 Break 235 Chcp 236 Chdir (CD) 236 Chkdsk 237 Cls 238 Command 238 Comp 239 Copy 239 Ctty 240 Date 241 Del(Erase) 241 Dir 242 Diskcomp 243 Diskcopy 243 Exe2bin 244 Exit 244 Fastopen 245 Fc 245 Fdisk 247 Find 247 Format 248 Graftabl 249 Graphics 249 Join 250 Keyb 251 Label 252 Mkdir (MD) 253 Mode 253 More 257 Nlsfunc 257 Path 257 Print 258 Prompt 259 Recover 260 Ren (Rename) 261 Replace 261 Restore 262 Rmdir (Rd) 263 Select 263 Set 264 Share 265 Sort 265 Subst 266 Sys 267 Time 267 Tree 268 Type 268 Ver 269 Verify 269 Vol 269 Xcopy 270 Looking Ahead 271 Chapter 7 Hacker Coding Fundamentals 273 The C Programming Language 273 Versions of C 274 Classifying the C Language 275 Structure of C 276 Comments 277 Libraries 277 C Compilation 278 Data Types 279 Operators 283 Functions 285 C Preprocessor Commands 290 Program Control Statements 293 Input and Output 297 Pointers 301 Structures 304 File I/O 311 Strings 321 Text Handling 328 Time 331 Header Files 337 Debugging 338 Float Errors 339 Error Handling 339 Casting 343 Prototyping 344 Pointers to Functions 345 Sizeof 347 Interrupts 347 Signal 350 Dynamic Memory Allocation 351 Atexit 354 Increasing Speed 355 Directory Searching 356 Accessing Expanded Memory 359 Accessing Extended Memory 363 TSR Programming 373 Conclusion 405 Chapter 8 Port, Socket, and Service Vulnerability Penetrations 407 Example Case Synopsis 407 Backdoor Kits 408 Implementing a Backdoor Kit 411 Common Backdoor Methods in Use 411 Packet Filters 412 Stateful Filters 417 Proxies and Application Gateways 422 Flooding 423 Log Bashing 434 Covering Online Tracks 434 Covering Keylogging Trails 436 Mail Bombing, Spamming, and Spoofing 447 Password Cracking 449 Decrypting versus 450 [...]... 4 2 1) 32+ 16 + 8+ 4+ 2+ 1 3 Bits: 1 Value: 12 8 64 12 8+ 0 0 1 = 12 7 1 1 1 1 32 (16 8 4 2 1) 16 + 8+ 4+ 2+ 1 3 Bits: 1 Value: 12 8 64 12 8+ 32+ 16 + 8+ 4+ 2+ 1 3 Bits: 1 Value: 12 8 64 12 8+ 64+ 0 1 1 1 1 1 1 32 (16 8 4 2 1) 0 1 = 15 9 1 = 19 1 1 1 1 1 32 (16 8 4 2 1) 16 + 8+ 4+ 2+ 1 = 223 Let’s take a look at the network broadcast addresses of our subnetted Class C block with mask 255.255.255.224: 206.0 .12 5.63... system that copies and delivers a single packet to all addresses on the network All hosts attached to a network can be notified by sending a packet to a common address known as the broadcast address: 3 Bits: 0 Value: 12 8 64 32+ 0 0 Value: 12 8 64 1 1 1 1 1 32 (16 8 4 2 1) 0 1 = 63 1 1 1 1 32 (16 8 4 2 1) +16 +8 +4 +2 +1 3 Bits: 0 Value: 12 8 64 64+ 1 16+ 8+ 4+ 2+ 1 3 Bits: 64 1 1 1 1 = 95 1 1 1 1 32 (16 8... primary field for gathering information, as well as for gaining control It is important to understand the methods a datagram uses to travel across networks To sufficiently travel across the Internet, over physical media, we want some guarantee that each datagram travels in a physical frame The process of a datagram traveling across media in a frame is called encapsulation Now, let’s take a look at an actual... Defense’s Advanced Research Projects Agency (ARPA, later called DARPA) began an experimental wide area network (WAN) that spanned the United States Called ARPANET, its original goal was to enable government affiliations, educational institutions, and research laboratories to share computing resources and to collaborate via file sharing and electronic mail It didn’t take long, however, for DARPA to realize... this chapter and in Chapter 2) IP Datagrams, Encapsulation, Size, and Fragmentation 8 IP datagrams are the very basic, or fundamental, transfer unit of the Internet An IP datagram is the unit of data commuted between IP modules IP datagrams have headers with fields that provide routing information used by infrastructure equipment such as routers (see Figure 1. 4) Figure 1. 4 An IP datagram Be aware that... 206.0 .12 5.95 206.0 .12 5 .12 7 206.0 .12 5 .15 9 206.0 .12 5 .19 1 206.0 .12 5.223 Step 5 So what are the available IP addresses for each of our six networks anyway? They are the addresses between the network and broadcast addresses for each subnet or network (see Figure 1. 11) 16 Figure 1. 11 Available IP addresses for our networks Unraveling IP with Shortcuts Let’s take a brief look at a shortcut for determining a network... Ports and Their Services o Chapter 5: Discovery and Scanning Techniques Part 4: Hacking Security Holes o Chapter 6: The Hacker’s Technology Handbook o Chapter 7: Hacker Coding Fundamentals o Chapter 8: Port, Socket, and Service Vulnerability Penetrations Part 5: Vulnerability Hacking Secrets Chapter 9: Gateways and Routers and Internet Server Daemons Chapter 10 : Operating Systems Chapter 11 : Proxies and... network address, given an IP address Given: 206.0 .13 9. 81 255.255.255.224 To calculate the network address for this host, let’s map out the host octet (. 81) and the subnet- masked octet (.224) by starting from the left, or largest, number: (. 81) Bits: 1 Value: 12 8 1 32 64 1 16 64+ 8 4 2 1 16+ (.224) Bits: 1 1 1 Value: 12 8 32 16 1= 81 64 8 4 2 1 128+ 64+ 32 = 224 Now we can perform a mathematic “logical AND”... and add it in succession to reveal all six subnets): 3 Bits: 0 0 1 0 0 0 0 0 Value: 12 8 64 32 (16 8 4 2 1) 32 = 32 3 Bits: 0 1 0 0 0 0 0 0 Value: 12 8 64 32 (16 8 4 2 1) 64 = 64 3 Bits: 0 1 1 0 0 0 0 0 Value: 12 8 64 32 (16 8 4 2 1) 64+ 32 = 96 3 Bits: 1 0 0 0 0 0 0 0 Value: 12 8 64 32 (16 8 4 2 1) 12 8 = 12 8 3 Bits: 1 0 1 0 0 0 0 0 Value: 12 8 64 32 (16 8 4 2 1) 12 8+ 32 = 16 0 3 Bits: 1 1 0 0 0 0 0 0 Value:... unreliable, best-effort delivery of datagrams through an Internetwork Datagrams can be described as a logical grouping of information sent as a network layer unit over a communication medium IP datagrams are the primary information units in the Internet Another of IP’s principal responsibilities is the fragmentation and reassembly of datagrams to support links with different transmission sizes Figure 1. 1 . Hack Attacks Revealed A Complete Reference with Custom Security Hacking Toolkit John Chirillo This netLibrary eBook does not include the ancillary media that was packaged with the. Social Engineering Query 15 6 Site Scans 15 7 Scanning Techniques 15 8 Scanner Packages 15 9 Sample Scan 17 3 Summary 18 0 Part IV: Hacking Security Holes 18 1 Intuitive Intermission A Hacker’s. the 19 60s, the U.S. Department of Defense’s Advanced Research Projects Agency (ARPA, later called DARPA) began an experimental wide area network (WAN) that spanned the United States. Called ARPANET,

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