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Generate QR Code in Software Figure 9-16 A USB to JTAG cable

Figure 9-16 A USB to JTAG cable
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Hacking Exposed 6: Network Security Secrets & Solutions
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Figure 9-17 A custom JTAG interface
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Barring access to vendor tools, there are several open projects that provide tools to interface with JTAG for ARM based processors The easiest to use are available from the OpenOCD project, which provides binaries for Windows and integration into the Eclipse development environment They can be acquired at http://openfactsberliosde/index-en phtml title=Building_OpenOCD and http://wwwyagartode/ A larger more ambitious project is the UrJTAG project, which supports a wide range of JTAG interfaces and devices The UrJTAG tools are available from http://wwwurjtagorg/
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Despite the ongoing transition to digital formats, information is still held behind traditional locks and in hardware devices that are the ultimate protector of its confidentiality, integrity, and availability We hope this chapter has prompted you to reconsider your overall program of protection for digital information, and to include threats from physical attacks as well as the many logical threats catalogued in this book
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It seems to be a slow day for Joe Hacker After spending hours on his last project, cracking WEP keys in the parking lot of his favorite retailer, he is looking for something different Joe has come to the realization over the years that firewalls are nothing more than a speed bump on the information super-highway Most sites now have the basics covered and use firewalls or some sort of Access Control Lists (ACL) to protect their web infrastructure The good sites (owned by people who have read the past five editions of Hacking Exposed) have implemented security above and beyond basic network protection (ports and protocols) They focused on locking down their web and database infrastructure since they are the crown jewels most of the bad guys are after However, given the dynamic nature of web development (those pesky marketing guys always want something changed), Joe realizes there is ample room for error He also is keenly aware that user initiated attacks are all the rage, as the user is most often the weakest link in the security lifecycle After a few games of Xbox and several Red Bulls to clear the cobwebs, he is ready for his next project Session riding in style Joe decides that he is going to try to make a little money on the side to help feed his Xbox addiction Not by legitimate means, of course He is aware of a local bank in town that has just added online banking to its list of benefits each customer is entitled to In fact, Joe is excited that he himself now has online backing access so he can avoid leaving the house (Xbox again) He also realizes that given the limited IT security resources of the local bank, there is a high probability that an attack vector exists and is just waiting to be exploited He decides to investigate Using Tor (as discussed in the case study at the beginning of Part I), Joe begins to poke and prod the website looking for common vulnerabilities He runs nikto, a web assessment tool, to see what goodies it gives up In addition, using his own account to provide access to the online backing application, Joe runs paros to evaluate the interaction of the client and the server He is methodically looking for any chink in the armor while trying not to raise any suspicion, since he is logged in under his own user name He attempts to manipulate the parameters using paros, but no luck Can they be that good, he wonders What looked like a short project for Joe has turned into many hours of investment; however, Joe is relentless He just needs one slipup With four empty cans of Red Bull on his desk, Joe peers at the clock and notices it is 4 am Just one more scan through the paros results, he thinks to himself BAM! Finally, a breakthrough Joe notices that the website allows the primary account holder to add subusers For example, Mr Jones, the primary account holder, can add his wife as a subuser so she can also access their accounts online While this functionality is questionable at best, the web designers thought they would include it in an effort to cut down on support requests to add new users of the same family This seems like a good idea to a web designer and a really bad idea to a security architect What if Joe could be added as a secondary user to any account that viewed the bank s website Sound farfetched Keep reading Cross-Site Request Forgery (CSRF) has been around for some time but has become much more prominent over the past few years Essentially, the attacker tricks the victim into loading a page that contains a malicious request The request is deemed malicious because it will inherit the privileges of the victim to perform an undesired function,
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generally controlled by session cookies CSRF generally targets functions that cause a state change, but can also be used to access sensitive information Joe realizes that the ideal scenario would be to store malicious code on the web server and have the clients of the bank execute this code (with their user privileges) by simply viewing a web page This attack technique is known as a Stored CSRF attack Joe s mind is frantically racing Where can I possibly store malicious code on a website, he asks himself Ahh Many times, websites allow users to store comments or ask questions as part of a forum He realizes that there is a forum for new users to ask questions about their online banking experience Joe decides this is the perfect spot to hide malicious code While using Tor to provide anonymity, Joe creates a phony forum user and imbeds an image tag into a simple post that asks for more information on how to log into the website However, instead of rendering an image, the image tag executes a GET request to add a subuser to the account of the person viewing the malicious content Of course, this subuser is Joe, with a password of his choosing Game over Joe is counting on some percentage of the Bank s user population being logged into their online banking site while visiting the forum If they are not logged in, this attack will not work as there is no session to ride Joe realizes that he will not have 100 percent success, but he only needs a few victims to feed his Xbox addiction As you can see from the preceding scenario, CSRF flaws may seem like an innocuous problem, but with the right motivation and the ability to chain vulnerabilities together, the results are devastating Keep in mind the greatest challenge we face as security practitioners is Layer 8, that is, the human element of security If people can be conned, phished, spoofed, or cajoled into clicking or viewing malicious content, there is little recourse The following chapters will provide more detail on Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), and user-initiated attacks as well as their countermeasures Read them, know them, and live them
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