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152 Chapter 5 n Bypassing Client-Side Controls to decompile, modify, and recompile a key class file and then use JSwat to hotswap it into the running application. To use JSwat, you need to launch an applet using the appletviewer tool included in the JDK and then connect JSwat to it. For example, you could use this command: appletviewer -J-Xdebug -J-Djava.compiler=NONE -J- Xrunjdwp:transport=dt_socket, server=y,suspend=n,address=5000 appletpage.htm Figure 5-7: Once a suitable method has been identified, JavaSnoop can be used to tamper with the return value from the method When you’re working on Silverlight objects, you can use the Silverlight Spy tool to monitor the component’s execution at runtime. This can greatly help correlate relevant code paths to events that occur within the user interface. Silverlight Spy is available from the following URL: http://firstfloorsoftware.com/SilverlightSpy/
Chapter 5 n Bypassing Client-Side Controls 153 Native Client Components Some applications need to perform actions within the user’s computer that cannot be conducted from inside a browser-based VM sandbox. In terms of client-side security controls, here are some examples of this functionality: n Verifying that a user has an up-to-date virus scanner n Verifying that proxy settings and other corporate configuration are in force n Integrating with a smartcard reader Typically, these kinds of actions require the use of native code components, which integrate local application functionality with web application functionality. Native client components are often delivered via ActiveX controls. These are custom browser extensions that run outside the browser sandbox. Native client components may be significantly harder to decipher than other browser extensions, because there is no equivalent to intermediate bytecode. However, the principles of bypassing client-side controls still apply, even if this requires a different toolset. Here are some examples of popular tools used for this task: n OllyDbg is a Windows debugger that can be used to step through native executable code, set breakpoints, and apply patches to executables, either on disk or at runtime. n IDA Pro is a disassembler that can produce human-readable assembly code from native executable code on a wide variety of platforms. Although a full-blown description is outside the scope of this book, the following are some useful resources if you want to know more about reverse engineering of native code components and related topics: n Reversing: Secrets of Reverse Engineering by Eldad Eilam n Hacker Disassembling Uncovered by Kris Kaspersky n The Art of Software Security Assessment by Mark Dowd, John McDonald, and Justin Schuh n Fuzzing for Software Security Testing and Quality Assurance (Artech House Information Security and Privacy) by Ari Takanen, Jared DeMott, and Charlie Miller n The IDA Pro Book: The Unofficial Guide to the World’s Most Popular Disassembler by Chris Eagle n www.acm.uiuc.edu/sigmil/RevEng n www.uninformed.org/?v=1&a=7
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The Web Application Hacker’s Hand
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About the Authors Dafydd Stuttard i
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MDSec: The Authors’ Company Dafyd
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Acknowledgments We are indebted to
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Contents Introduction xxiii Chapter
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Contents xi Chapter 5 Bypassing Cli
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Contents xiii Testing Restrictions
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Contents xv Payloads for XSS Attack
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Contents xvii “Off-by-One” Vuln
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Contents xix Technical Challenges F
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Contents xxi 12 Miscellaneous Check
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xxiv Introduction attacker. If you
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xxvi Introduction Chapters 6, 7, an
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xxviii Introduction internal workin
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xxx Introduction If you want to foc
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xxxii Introduction web users that d
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CHAPTER 1 Web Application (In)secur
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Chapter 1 n Web Application (In)sec
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CHAPTER 3 Web Application Technolog
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Chapter 3 n Web Application Technol
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CHAPTER 7 Attacking Session Managem
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Chapter 7 n Attacking Session Manag
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CHAPTER 8 Attacking Access Controls
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Chapter 8 n Attacking Access Contro
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288 Chapter 9 n Attacking Data Stor
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358 Chapter 10 n Attacking Back-End
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406 Chapter 11 n Attacking Applicat
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432 Chapter 12 n Attacking Users: C
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CHAPTER 13 Attacking Users: Other T
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Chapter 13 n Attacking Users: Other
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616 Chapter 15 n Exploiting Informa
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CHAPTER 16 Attacking Native Compile
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670 Chapter 18 n Attacking the Appl
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CHAPTER 19 Finding Vulnerabilities
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Chapter 19 n Finding Vulnerabilitie
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748 Chapter 20 n A Web Application
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854 Index n A-A hacker’s methodol
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856 Index n B-B meaningful, 212 URL
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858 Index n C-C XSS, 450-451 “cha
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860 Index n D-D CSS. See Cascading
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862 Index n F-F detecting hits, 574
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864 Index n H-H script injection, 8
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866 Index n J-J error messages, 388
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868 Index n M-O secret questions, 1
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870 Index n Q-R user input, 379-380
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872 Index n S-S second-order XSS. S
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874 Index n T-T signatures of commo
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876 Index n V-W provisos, 305-306 S
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878 Index n X-Z WHERE clause DELETE
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