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In this chapter we have discussed the most common, and some less than common, vulnerabilities discovered on the Internet From input validation vulnerabilities to buffer overflow conditions to simple web design weaknesses, attackers have a number of avenues to pursue when attempting to gain access to or otherwise trick your web servers While most of the input validation and buffer overflow vulnerabilities have simple fixes, the problem of poorly designed web servers can be more difficult to tackle, especially once the design is in place However, unused sample script removal, script input sanitizing, and web design changes, including restriction of Server Side Includes, hidden tags, and user file appending, can go a long way to make the job of the attacker much more difficult

.

String CleanInput(string strIn) { // Replace invalid characters with empty strings return RegexReplace(strIn, @"[^\w\@-]", ""); }

e ve spent a lot of time in this book talking about common techniques for breaking into systems that are owned by companies and run by experienced administrators After all, that s where all the valuables are, right What could malicious hackers possibly hope to attain from breaking into Granny s home computer The reality is, Granny is only part of the picture Everyone uses the products preyed upon in this chapter: web browsers, email readers, and all manner of Internet client software Everyone is thus a potential victim, and the information on their system is likely just as critical as the stuff sitting on a web server, if not more so The sheer distributed nature of the problem also makes it much harder to address than its counterpart on the server side The tools and techniques highlighted in his chapter affect not just individuals, but can also have a devastating impact on the organizations they work for If you consider that everyone from CEO to shipping clerk uses this software for nearly 90 percent of their daily activities (namely email reading and web browsing), it might dawn on you that this is indeed a serious issue for corporate users as well as for the average consumer Internet surfer (yes, even Granny) Also consider the potential public relations embarrassment and potential downstream liability for a company that perpetuated the spread of malicious code like worms by not taking the appropriate security measures Worried yet Hacking the Internet user is snowballing in popularity among the underground if the hail of Internet client software security advisories released in 2000 is any indication Client-side hacking requires only a slightly different mindset from that which seeks to compromise major Internet servers such as wwwamazoncom, anyway The difference is one of degree of effort and scale Instead of focusing intense intellectual effort against one unique target or specific web server application, user hacking seeks to find a common denominator among the widest range of potential victims Typically, this common denominator is a combination of frequent Internet usage, Microsoft s overwhelmingly popular and widely used software products, and lack of security savvy among the biological organisms operating that software We ve already covered some of the many ways that these omnipresent factors can be exploited 4 discussed attacks against Microsoft s consumer operating systems most used by Internet denizens (Win 9x/ME) s 4 and 14 covered Trojans and back doors often planted on unsuspecting user s systems, as well as the technique of social engineering that is so effective in getting a computer s human operator to perform the malicious hacker s bidding using nontechnical means This chapter will build on some of this work It will introduce entirely different and more insidious paths by which back doors can be planted, as well as a more technical route for launching some of the most subliminal social attacks (that is, the subject line of an email message) Before we begin, we must warn those of faint heart that what we are about to show you is incredibly volatile if used unwisely Unquestionably, we will be criticized for explaining in detail how all these attacks are actually implemented To which we will answer, as we have throughout this book: only in understanding the ways of the enemy in intimate detail will we protect potential victims Our own journey of discovery through.

Another thing to consider for applications with challenging input constraint requirements (such as search engines) is to perform output validation As we noted in our discussion of XSS earlier in this chapter, output encoding should be used anytime input from one user will be displayed to another (even especially! administrative

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