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CHAPTER 10 s CROSS-DOMAIN SECURITY IN WEB APPLICATIONS
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Modifying Web Pages A third possibility would be for the attacker to script modifications to a web page loaded from the vulnerable site by manipulating the page s DOM; in this case, the modified page would be intended for viewing by the victim user and likely be part of a social engineering or phishing attack. Since the page being modified was loaded from the vulnerable site (e.g., www.mywwwservice.com), the user would see a www.mywwwservice.com/path/... URL in her browser s URL bar. In case of a https URL, the user would not see any certificate-mismatch warnings, and even if she inspected the site s SSL certificate (by double-clicking the lock icon in popular browsers), she would be presented with the site s genuine certificate. It would be very difficult for the user to tell that she is viewing a web page that has been modified by a third party.
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Sources of Untrusted Data
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In the example within Section 10.2.3, the vector by which the attacker was able to inject malicious script into a document viewed by the victim was a query parameter of a URL of the vulnerable application. Query parameters (or HTML form fields) are a common and often easily exploited XSS vector. However, any data that may be under the control of an attacker and that is inserted into HTML documents must be considered for XSS vulnerabilities. Sources of such data include, but are not limited to URL query parameters The path of the URL (which, for instance, may be inserted into the page as part of a Document not found error message) HTML form fields (POST parameters; note that this includes hidden fields) Cookies Other parts of the HTTP request header, such as the Referer header Data that was inserted into a data store (SQL databases, files, custom data stores) in an earlier transaction, possibly by a different user (e.g., messages in a message board application) Data obtained from a third-party data feed (e.g., an RSS feed)
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Stored vs. Reflected XSS
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XSS scenarios are sometimes categorized based on what user interactions lead to the triggering of the exploit. The term reflected XSS is commonly used to describe situations such as the first example in this section, in which the victim is lured into making a request to the vulnerable web application, and script is injected via parameters of that request and returned (reflected) immediately as part of the resulting response. In contrast, situations in which injected script is delivered to victim users some time after it was injected into the system (and is stored somehow in the intervening period) are referred to as stored XSS.
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CHAPTER 10 s CROSS-DOMAIN SECURITY IN WEB APPLICATIONS
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XSS vulnerabilities that permit stored XSS attacks can be more damaging, because it may be possible for the attacker to arrange for his exploit to be triggered every time a victim accesses the application in question (rather than only when the victim was lured into viewing a malicious page controlled by the attacker). Furthermore, it may be possible that users can be attacked without having to be lured to a malicious page at all. For example, if a message board application permits script injection via a part of a posted message, all users who view that malicious message will be attacked.
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MYSPACE ATTACKED BY STORED XSS WORM
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XSS attacks can be particularly damaging in situations in which a stored XSS attack propagates from user account to user account in a worm-like pattern (we discussed worms that exploit vulnerabilities in serverside applications to propagate from server to server in 5). For example, in 2005, an XSS worm was released on the MySpace social networking site. The worm exploited an XSS vulnerability in the MySpace application that allowed stored XSS to propagate from user profile page to user profile page along the friend relationships within the MySpace social network. The actual payload of this worm was fairly harmless; it simply added a particular user, Samy, to the list of the infected user s friends. Nevertheless, MySpace had to be shut down for several hours to clean up the infected profiles and prevent additional XSS. Needless to say, the impact of an XSS worm could be much worse.
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However, we note that stored and reflected XSS are not fundamentally different; in both cases, the underlying issue is that untrusted data can be delivered to a user s browser such that script chosen by the attacker is executed in the user s browser in the context of the vulnerable application.
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