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Be wary of sites that use cookies for authentication and storage of sensitive personal data There are numerous tools available today that can manage cookies on your system (try searching http://wwwdownloadcom for the term cookie and sort by number of recent downloads to see the most popular utilities of this sort) In general, these tools enable you to see what s going on behind the scenes so you can decide whether you want to allow such activity Microsoft s Internet Explorer has a built-in cookie-screening feature, available under the Security tab of the Internet Options control panel: Internet Zone | Custom Level | Prompt for persistent and per-session cookies In IE6 and later, more advanced cookie-screening options can be set under the Internet Options control panel s Privacy tab Netscape browser cookie behavior is set via Edit | Preferences | Advanced and checking either Warn Me Before Accepting a Cookie or Disable Cookies For those cookies that you do accept, check them out if they are written to disk and see whether the site is storing any personal information about you Also remember, if you visit a site that uses cookies for authentication, it should at least use SSL to encrypt the initial post of your username and password so that it doesn t just show up as plaintext on the wire You should also verify that the site does not use the HTTP GET method to accept your credentials, because this could expose sensitive usernames and passwords without encryption in the return query string (which is potentially visible both in transit and in the web server logs and who knows who has access to those!) We d prefer to disable cookies outright, but many of the sites we frequent often require them to be enabled For example, Microsoft s wildly popular Hotmail service requires cookies to be enabled in order to log in Because Hotmail rotates among various authentication servers, it isn t easy just to add Hotmail to the Trusted Sites zone under Internet Options You could use the *hotmailcom wildcard notation to help out here Cookies are an imperfect solution to inadequacies in HTTP, but the alternatives are probably much worse (for example, appending an identifier to URLs that may be stored on proxies) Until someone comes up with a better idea, monitoring cookies using the tools referenced earlier is the only solution.

GET http://wwwvictimnet/images/logogif HTTP/10 Accept: */* Referrer: http://wwwvictimnet/ Host: wwwvictimnet Cookie: jrunsessionid=96114024278141622; cuid=T0RPMlZXTFRLR1pWTVFISEblahblah

Cross-Site Scripting (XSS)

Cutters U Countermeasures: Cookiefor authentication and storage of sensitive personal data Be wary of sites that use cookies

XSS gained its current name and a lot of visibility circa 2001 when exploits began to truly proliferate as an effective vehicle for online scams As we discussed in 11, XSS results from a flaw in the design of a web server based application Nevertheless, XSS typically requires the complicity of the end user in formulating an end-to-end exploit, which is why we bring it up in our discussion of client-side hacking in this chapter XSS typically results from a web application that takes input from one user (or set of users) and displays it to another user (or set of users) By carefully crafting input, malicious users can get code to execute on the machines of other hapless users For example, the following code, whether activated from a malicious website or HTML

You can plainly see the cookie token supplied in this HTTP request sent to the server The relevant portion is cuid= , which denotes a unique identifier used to authenticate this user of the site wwwvictimnet Let s say the attackers now visit victimnet, create their own login ID, and receive their own cookie It just so happens that victimnet sets persistent cookies that are written to files on disk (as opposed to per-session cookies stored in volatile memory) Attackers can open their own cookie and replace the cuid= entry with the one they sniffed Upon logging back in to victimnet, the attackers are now masquerading as the original customer PeepNet s ability to replay an entire session or to select portions of it makes this type of attack much easier By use of the Go Get It! button, the actual pages viewed by a user can be retrieved, using the same cookie snarfed earlier by CaptureNet Figure 16-4 illustrates PeepNet displaying someone s completed orders using their authentication cookie sniffed by CaptureNet (see the lower-right frame following the Cookie: notation these are the session and authentication cookies, respectively) This is a pretty nifty trick CaptureNet can also present a full decode of recorded traffic that s nearly equivalent to the output of professional-level protocol analysis tools like Network Associates, Inc s SnifferPro Even better, SpyNet is free!

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